TITLE 18. ENVIRONMENTAL QUALITY

CHAPTER 4. DEPARTMENT OF ENVIRONMENTAL QUALITY
SAFE DRINKING WATER

Supp. 04-1

ARTICLE 1. GENERAL REQUIREMENTS

Article 1, consisting of Sections R18-4-101 through R18-4-123, adopted effective April 28, 1995 (Supp. 95-2).

Article 1, consisting of R18-4-101 through R18-4-115, recodified to 18 A.A.C. Title 5, Article 1, R18-5-101 through R18-5-115 (Supp. 95-2).

Section

R18-4-101. Definitions

R18-4-102. Applicability

R18-4-103. Recordkeeping Requirements

R18-4-104. Reporting Requirements

R18-4-105. Repealed

R18-4-105.01. Public Notification Requirements (Effective May 6, 2002)

R18-4-106. Use of Approved Analytical Methods

R18-4-107. Use of Licensed Laboratories

R18-4-108. Sample Collection, Preservation, and Transportation

R18-4-109. Alternate Variances

R18-4-110. Variances

R18-4-111. Exemptions

R18-4-112. Exclusions

R18-4-113. Consecutive Public Water Systems

R18-4-114. Certified Operators

R18-4-115. Backflow Prevention

R18-4-116. Emergency Operations Plans

R18-4-117. Unsafe Supplies

R18-4-118. Sanitary Surveys

R18-4-119. Standards for Additives, Materials, and Equipment

R18-4-120. Monitoring and Sampling by the Department

R18-4-121. Enforcement

R18-4-122. Entry and Inspection of Public Water Systems

Appendix A. Renumbered

R18-4-123. Vending Machines

R18-4-124. Operation and Maintenance

R18-4-125. Hauled Water

Appendix A. Regulated Contaminants

ARTICLE 2. MAXIMUM CONTAMINANT LEVELS AND MONITORING REQUIREMENTS; MONITORING ASSISTANCE PROGRAM

Article 2, consisting of Sections R18-4-201 through R18-4-223 adopted effective April 28, 1995 (Supp. 95-2).

Article 2, consisting of Sections R18-4-201 through R18-4-290, repealed effective April 28, 1995 (Supp. 95-2).

Article 2 consisting of Sections R18-4-201 through R18-4-290, adopted effective August 8, 1991 (Supp. 91-3).

Article 2 consisting of Sections R18-4-201 through R18-4-290 and Appendices 1-7, repealed effective August 8, 1991 (Supp. 91-3).

Article 2 consisting of Sections R9-8-210 through R9-8-213, R9-8-220 through R9-8-227, R9-8-230 through R9-8-236, R9-8-250 through R9-8-253, R9-8-260 through R9-8-273, R9-8-290, and Appendices 1 through 6 renumbered as Article 2, Sections R18-4-210 through R18-4-213, R18-4-220 through R18-4-227, R18-4-230 through R18-4-236, R18-4-250 through R18-4-253, R18-4-260 through R18-4-273, R18-4-290, and Appendices 1 through 6 (Supp. 87-3).

Section

R18-4-201. Maximum Contaminant Levels: Public Water Systems Affected

R18-4-202. Total Coliform; MCLs and Monitoring Requirements

R18-4-203. Total Coliform; Special Events

R18-4-204. Turbidity; Interim MCLs and Monitoring Requirements

R18-4-205. Inorganic Chemicals; MCLs

R18-4-206. Monitoring Requirements for Antimony, Arsenic, Barium, Beryllium, Cadmium, Chromium, Cyanide, Fluoride, Mercury, Selenium, and Thallium

R18-4-207. Asbestos; Monitoring Requirements

R18-4-208. Nitrate; Monitoring Requirements

R18-4-209. Nitrite; Monitoring Requirements

R18-4-210. Repealed

R18-4-211. Volatile Organic Chemicals; MCLs

R18-4-212. Volatile Organic Chemicals; Monitoring Requirements

R18-4-213. Vinyl Chloride; Monitoring Requirements

R18-4-214. Total Trihalomethanes; MCL and Monitoring Requirements (Repeal January 1, 2004)

R18-4-214.01. Disinfectant Residuals and Disinfection Byproducts (Effective May 1, 2002; Repeal January 1, 2004)

R18-4-214.02. Disinfectant Residuals and Disinfection Byproducts (Effective January 1, 2004)

R18-4-215. Synthetic Organic Chemicals; MCLs

R18-4-216. Synthetic Organic Chemicals; Monitoring Requirements

R18-4-217. Radiochemicals; MCLs and Monitoring Requirements

R18-4-218. Sampling Points

R18-4-219. Sample Compositing

R18-4-220. Best Available Technology

R18-4-221. Use of Blending to Achieve Compliance with Maximum Contaminant Levels

R18-4-222. Use of Point-of-entry or Point-of-use Treatment Devices

R18-4-223. Use of Bottled Water

R18-4-224. The Monitoring Assistance Program

R18-4-225. Fees for the Monitoring Assistance Program

Table A. Repealed

R18-4-226. Collection and Payment of Fees

R18-4-227. Repealed

R18-4-228. Repealed

R18-4-229. Repealed

R18-4-230. Repealed

R18-4-231. Repealed

R18-4-232. Repealed

R18-4-233. Repealed

R18-4-234. Repealed

R18-4-235. Repealed

R18-4-236. Repealed

R18-4-237. Repealed

R18-4-238. Repealed

R18-4-239. Repealed

R18-4-240. Repealed

R18-4-241. Repealed

R18-4-242. Repealed

R18-4-243. Repealed

R18-4-244. Repealed

R18-4-245. Repealed

R18-4-246. Repealed

R18-4-247. Repealed

R18-4-248. Repealed

R18-4-249. Repealed

R18-4-250. Repealed

R18-4-251. Repealed

R18-4-252. Repealed

R18-4-253. Repealed

R18-4-254. Reserved

R18-4-255. Reserved

R18-4-256. Reserved

R18-4-257. Reserved

R18-4-258. Reserved

R18-4-259. Reserved

R18-4-260. Repealed

R18-4-261. Repealed

R18-4-262. Repealed

R18-4-263. Repealed

R18-4-264. Repealed

R18-4-265. Repealed

R18-4-266. Repealed

R18-4-267. Repealed

R18-4-268. Repealed

R18-4-269. Repealed

R18-4-270. Repealed

R18-4-271. Repealed

R18-4-272. Repealed

R18-4-273. Repealed

R18-4-274. Reserved

R18-4-275. Reserved

R18-4-276. Reserved

R18-4-277. Reserved

R18-4-278. Reserved

R18-4-279. Reserved

R18-4-280. Repealed

R18-4-281. Repealed

R18-4-282. Repealed

R18-4-283. Reserved

R18-4-284. Reserved

R18-4-285. Reserved

R18-4-286. Reserved

R18-4-287. Reserved

R18-4-288. Reserved

R18-4-289. Reserved

R18-4-290. Repealed

Appendix 1. Repealed

Appendix 2. Repealed

Appendix 3. Repealed

Appendix 4. Repealed

Appendix 5. Repealed

Appendix 6. Repealed

Appendix 7. Repealed

ARTICLE 3. TREATMENT TECHNIQUES

Article 3, consisting of Sections R18-4-301 thru R18-4-317, adopted effective April 28, 1995 (Supp. 95-2).

Section

R18-4-301. Surface Water Treatment

R18-4-301.01. Groundwater Under the Direct Influence of Surface Water

Table 1. Decision Matrix for Determining Groundwater Under the Direct Influence of Surface Water

R18-4-301.02. Control of Disinfection Byproduct Precursors by Enhanced Coagulation and Enhanced Softening

R18-4-302. Filtration

R18-4-303. Disinfection

R18-4-304. Groundwater Treatment

R18-4-305. Renumbered

R18-4-306. Lead and Copper; Applicability

R18-4-307. Lead and Copper; General Requirements

R18-4-308. Lead and Copper Action Levels

R18-4-309. Lead and Copper; Targeted Sampling Sites and Materials Survey

R18-4-310. Lead and Copper; Tap Water Monitoring

R18-4-311. Lead and Copper; Water Quality Parameter Monitoring

R18-4-312. Lead and Copper; Corrosion Control Studies

R18-4-313. Lead and Copper; Corrosion Control Treatment

R18-4-314. Lead and Copper; Source Water Monitoring and Treatment

R18-4-315. Lead and Copper; Lead Service Line Replacement

R18-4-316. Public Education Requirements for Lead

R18-4-317. Treatment Techniques for Acrylamide and Epichlorohydrin

Table 1. Repealed

Appendix A. Lead Public Education

Appendix B. Alternate Lead Public Education

ARTICLE 4. SPECIAL MONITORING REQUIREMENTS

Article 4, consisting of Sections R18-4-401 thru R18-4-405, adopted effective April 28, 1995 (Supp. 95-2).

Section

R18-4-401. Special Monitoring for Sodium

R18-4-402. Special Monitoring for Nickel

R18-4-403. Special Monitoring for Turbidity

R18-4-404. Repealed

R18-4-405. Repealed

ARTICLE 5. RECODIFIED

Article 5 recodified to 18 A.A.C. 5, Article 5 at 10 A.A.R. 585, effective January 30, 2004 (Supp. 04-1).

Article 5, consisting of Sections R18-4-501 through R18-4-509, adopted effective April 28, 1995 (Supp. 95-2).

Appendices A, B, and C adopted effective April 28, 1995 (Supp. 95-2).

Section

R18-4-501. Recodified

R18-4-502. Recodified

R18-4-503. Recodified

R18-4-504. Recodified

R18-4-505. Recodified

R18-4-506. Recodified

R18-4-507. Recodified

R18-4-508. Recodified

R18-4-509. Recodified

Appendix A. Repealed

Appendix B. Repealed

Appendix C. Renumbered

ARTICLE 6. CAPACITY DEVELOPMENT REQUIREMENTS FOR A NEW PUBLIC DRINKING WATER SYSTEM

Article 6, consisting of Sections R18-4-601 through R18-4-607, adopted by final rulemaking at 5 A.A.R. 4456, effective September 23, 1999 (Supp. 99-4).

Article 6, consisting of Sections R18-4-601 through R18-4-607, adopted by final rulemaking effective September 23, 1999; the A.A.R. citation was not available at the time of publication and will appear in Supp. 99-4 (Supp. 99-3).

Section

R18-4-601. Applicability

R18-4-602. Elementary Business Plan

R18-4-603. Technical Capacity

R18-4-604. Managerial Capacity

R18-4-605. Financial Capacity

R18-4-606. Review, Approval, Denial Process

R18-4-607. Appeals

Appendix A. Capacity Development Review Checklist for CWS and NTNCWS

Appendix B. General Statement of Responsibility by Owner

Appendix C. Financial Capacity for CWS and NTNCWS Worksheet 1

Appendix D. CWS and NTNCWS Financial Viability Test

ARTICLE 7. CONSUMER CONFIDENCE REPORTS

Article 7, consisting of Sections R18-4-701 through R18-4-710 and Appendices A and B, adopted by final rulemaking at 6 A.A.R. 2019, effective May 10, 2000 (Supp. 00-2).

Section

R18-4-701. Applicability

R18-4-702. General Requirements

R18-4-703. Content of Consumer Confidence Reports

R18-4-704. Information on Detected Contaminants

R18-4-705. Information on Cryptosporidium and Radon

R18-4-706. Information on Violations

R18-4-707. Variances and Exemptions

R18-4-708. Additional Information

R18-4-709. Additional Health Information

R18-4-710. Consumer Confidence Report Delivery and Recordkeeping

Appendix A. Repealed

Appendix B. Repealed

Appendix C. Repealed

ARTICLE 8. TECHNICAL ASSISTANCE

Article 8, consisting of Sections R18-4-801 through R18-4-804, made by final rulemaking at 8 A.A.R. 262, effective December 27, 2001 (Supp. 01-4).

Section

R18-4-801. Definitions

R18-4-802. Technical Assistance Plan

R18-4-803. Master Priority List

R18-4-804. Technical Assistance Awards

ARTICLE 1. GENERAL REQUIREMENTS

R18-4-101. Definitions

In addition to the definitions in A.R.S. § 49-201, in this Chapter, unless otherwise specified:

"Action level" means a concentration of 0.015 mg/L for lead or 1.3 mg/L for copper.

"ADHS" means the Arizona Department of Health Services.

"Air-gap separation" means a physical separation, between the discharge end of a supply pipe and the top rim of its receiving vessel, of at least one inch or twice the diameter of the supply pipe, whichever is greater.

"ANSI/NSF Standard 60" means American National Standards Institute/NSF International Standard 60 - 2000a, Drinking Water Treatment Chemicals - Health Effects, November 2000, incorporated by reference and on file with the Department and the Office of the Secretary of State. This material is available from NSF International, 789 North Dixboro Road, P.O. Box 130140, Ann Arbor, MI 48113-0140, USA; (734) 769-8010; http://www.nsf.org. This incorporation by reference includes no future editions or amendments.

"ANSI/NSF Standard 61" means American National Standards Institute/NSF International Standard 61 - 2000a, Drinking Water System Components - Health Effects, November 2000, incorporated by reference and on file with the Department and the Office of the Secretary of State. This material is available from NSF International, 789 North Dixboro Road, P.O. Box 130140, Ann Arbor, MI 48113-0140, USA; (734) 769-8010; http://www.nsf.org. This incorporation by reference includes no future editions or amendments.

"Backflow" means a reverse flow condition that causes water or mixtures of water and other liquids, gases, or substances to flow back into the distribution system. Backflow can be created by a difference in water pressure (backpressure), a vacuum or partial vacuum (backsiphonage), or a combination of both.

"Backflow-prevention assembly" means a mechanical device used to prevent backflow.

"Baseline sampling" means the routine monitoring of contaminants covered under the monitoring assistance program to determine compliance with the MCLs listed in Article 2 and the monitoring requirements listed in Article 4, not including repeat monitoring necessary for compliance after detection of a contaminant or a MCL violation.

"BAT" means best available technology.

"Best available technology" means a technology, treatment technique, or other means that is identified by EPA, after examination for efficacy under field conditions and not solely under laboratory conditions, as being the best available for removing or reducing the concentration of a contaminant in water, taking costs into consideration.

"CCR" means Consumer Confidence Report.

"Certified operator" has the meaning prescribed by R18-5-101.

"Coagulation" means a treatment process that uses coagulant chemicals and mixing to destabilize and agglomerate colloidal and suspended materials into flocs.

"Community water system" means a public water system that serves 15 or more service connections used by year-round residents or that serves 25 or more year-round residents.

"Compliance cycle" means a nine-calendar-year time-frame during which a public water system is required to monitor. Each compliance cycle consists of three three-year compliance periods. The first compliance cycle began January 1, 1993, and ends December 31, 2001. The second compliance cycle begins January 1, 2002, and ends December 31, 2010. The third compliance cycle begins January 1, 2011, and ends December 31, 2019.

"Compliance period" means a three-calendar-year time-frame within a compliance cycle. Within the first compliance cycle, the first compliance period began January 1, 1993, and ended December 31, 1995. The second compliance period began January 1, 1996, and ended December 31, 1998. The third compliance period began January 1, 1999, and ends December 31, 2001.

"Comprehensive performance evaluation" means a thorough review and analysis of a water treatment plant's performance-based capabilities and associated administrative, operation and maintenance practices. A comprehensive performance evaluation consists of at least the following components: assessment of water treatment plant performance, evaluation of major unit processes, identification and prioritization of performance limiting factors, assessment of the applicability of comprehensive technical assistance, and preparation of a comprehensive performance evaluation report.

"Consecutive public water system" means a public water system that obtains all of its water from another public water system that is regulated by the Department.

"Contaminant" means any physical, chemical, biological, or radiological substance in water.

"Contractor" means a private party or statewide nonprofit organization representing a water system, with which the Department contracts to implement the monitoring assistance program under A.R.S. § 49-360(B).

"Conventional filtration" means a series of treatment processes, including coagulation, flocculation, sedimentation, and filtration that result in substantial particulate removal.

"Corrosion inhibitor" means a substance that reduces corrosion of metal plumbing materials, especially lead and copper, by forming a protective film on the interior surface of those materials.

"Cross connection" means a physical connection between a public water system and any source of water or other substance that may lead to contamination of the water provided by the public water system through backflow.

"CWS" means community water system.

"Detected" means measured in a laboratory at a concentration that is at or above the method detection limit.

"Diatomaceous earth filtration" means a treatment process that results in substantial particulate removal in which a precoat cake of diatomaceous earth filter media is deposited on a support membrane (septum) and, while the water is filtered through the precoat cake on the septum, additional filter media (body feed) is continuously added to the feed water to maintain the permeability of the precoat cake.

"Direct filtration" means a series of treatment processes, including coagulation and filtration but excluding sedimentation, that result in substantial particulate removal.

"Disinfectant" means an oxidant, including chlorine, chlorine dioxide, chloramines, ozone, or an equivalent agent or process such as ultraviolet light, that kills or inactivates pathogenic organisms.

"Disinfection" means a treatment process that kills or inactivates pathogenic organisms in water by oxidants, ultraviolet light, or equivalent agents.

"Distribution system" means a pipeline, appurtenance, device, and facility of a public water system that conducts water from a source or water treatment plant to persons served by the system.

"Domestic or other non-distribution system plumbing problem" means a total coliform contamination problem in a public water system with more than one service connection that is limited to a specific service connection from which a total coliform-positive sample is taken.

"Dose equivalent" means the product of an absorbed dose from ionizing radiation and factors that account for differences in biological effectiveness due to the type of radiation and its distribution in the body as specified by the International Commission on Radiological Units and Measurements.

"Double check valve assembly" means a backflow-prevention assembly that contains two independently acting check valves with tightly closing, resilient-seated shut-off valves on each end of the assembly and properly located, resilient-seated test cocks.

"Elementary business plan" means a document containing all items, required to be submitted for evaluation, necessary for a complete review for technical, managerial, and financial capacity of a new public water system under Article 6.

"Enhanced coagulation" means the addition of sufficient coagulant for improved removal of disinfection byproduct precursors by conventional filtration treatment.

"Enhanced softening" means the improved removal of disinfection byproduct precursors by precipitative softening.

"EPA" means the United States Environmental Protection Agency.

"Exclusion" means a waiver granted by the Department under R18-4-112 from a requirement of this Chapter that is not a requirement contained in 40 CFR 141, the National Primary Drinking Water Regulations.

"Exemption" means a temporary deviation from a MCL or treatment technique required in this Chapter that is granted by the Department under R18-4-111.

"Existing public water system" means a public water system, as defined in A.R.S. § 49-352(B)(1), issued a public water system identification number by the Department before October 1, 1999.

"Filter profile" means a graphical representation of individual filter performance, based on continuous turbidity measurements or total particle counts versus time for an entire filter run, from startup to backwash inclusively, that includes an assessment of filter performance while another filter is being backwashed.

"Filtration" means a treatment process for removing particulate matter from water by passage through porous media.

"Financial capacity" means the ability of a public water system to acquire and manage sufficient financial resources for the system to achieve and maintain compliance with the federal Safe Drinking Water Act.

"First-draw sample" means a one-liter sample of tap water, collected in accordance with R18-4-310(D).

"Flocculation" means a treatment process to enhance agglomeration or collection of smaller floc particles into larger and more easily settleable particles through gentle stirring by hydraulic or mechanical means.

"GAC" means granular activated carbon.

"GAC10" means granular activated carbon filter beds with an empty-bed contact time of 10 minutes based on average daily flow and a carbon reactivation frequency of every 180 days.

"GC" means gas chromatography.

"GC/MS" means gas chromatography-mass spectrometry.

"Gross alpha particle activity" means the total radioactivity due to alpha particle emission as inferred from measurements on a dry sample.

"Gross beta particle activity" means the total radioactivity due to beta particle emission as inferred from measurements on a dry sample.

"Groundwater system" means a public water system that is supplied solely by groundwater that is not under the direct influence of surface water.

"Groundwater under the direct influence of surface water" means any water beneath the surface of the ground with:

A significant occurrence of insects or other macroorganisms, algae, large diameter pathogens such as Giardia lamblia, or total coliform; or

Significant and relatively rapid shifts in water characteristics such as turbidity, temperature, conductivity, or pH that closely correlate to climatological or surface water conditions.

"HAA5" means haloacetic acids (five).

"Haloacetic acids (five)" means the sum of the concentrations in milligrams per liter of the haloacetic acid compounds (monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid, and dibromoacetic acid), rounded to two significant figures after addition.

"Halogenated" means treated or mixed with chlorine, bromine, or iodine.

"HPC" means heterotrophic plate count.

"Initial compliance period" means the first full three-year compliance period in a compliance cycle that a public water system conducts initial monitoring.

"Initial monitoring year" means the calendar year designated by the Department within a compliance period in which a public water system conducts initial monitoring at a sampling point.

"Large water system," for R18-4-306 through R18-4-316 only, means a public water system that serves more than 50,000 persons.

"Lead-free" means that the pipe, solder, or flux used in the installation or repair of a public water system, or in a residential or non-residential facility that provides water for human consumption and is connected to the public water system, meets the following criteria:

All solders and flux contain not more than 0.2% lead.

All pipes and pipe fittings contain not more than 8.0% lead.

When used with respect to plumbing fittings and fixtures intended by the manufacturer to dispense water for human ingestion, "lead-free" means fittings and fixtures that are in compliance with ANSI/NSF Standard 61, Section 9.

"Lead service line" means a service line made of lead that connects a water main to a building inlet and any lead pigtail, gooseneck, or fitting that is connected to the service line.

"Log" means the percentage removal or inactivation of Cryptosporidium oocysts, Giardia lamblia cysts, or viruses as follows:

"One-log" is 90%.

"Two-log" is 99%.

"Three-log" is 99.9%.

"Four-log" is 99.99%.

"Major stockholder" means a person who has 20% or more ownership interest in a public water system.

"Man-made beta particle and photon emitters" means all radionuclides emitting beta particles or photons, except the daughter products of Thorium-232, Uranium-235, and Uranium-238, listed in "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of Radionuclides in Air and in Water for Occupational Exposure," Handbook 69, U.S. Department of Commerce, National Bureau of Standards, amended as of August 1963 (and no future editions or amendments), incorporated by reference and on file with the Office of the Secretary of State and the Department. Copies of Handbook 69 are also available from the Library of Congress, 101 Independence Avenue, S.E., Washington D.C., 20540, by telephoning (202) 707-5640.

"Managerial capacity" means the ability of a public water system to conduct its affairs in a manner that will meet and maintain compliance with the requirements of the federal Safe Drinking Water Act.

"Maximum contaminant level" means the maximum permissible level for a contaminant in drinking water that is delivered to any person who is served by a public water system.

"Maximum residual disinfectant level" means a level of a disinfectant added for water treatment that may not be exceeded at the consumer's tap without an unacceptable possibility of adverse health effects.

"Maximum total trihalomethane potential" means the maximum concentration of total trihalomethanes produced in water containing a disinfectant residual after seven days at a temperature of 25° C or above.

"MCL" means maximum contaminant level.

"MFL" means million fibers per liter greater than 10 microns in length.

"Medium water system," for R18-4-306 through R18-4-316 only, means a public water system that serves more than 3,300 persons and 50,000 or fewer persons.

"Meter" means a device that measures the volume of water that passes through it.

"Meter weight" means the number of gallons per minute (gpm) that flows through a meter divided by 30.

"Millirem" means 1/1000 of a rem.

"MRDL" means maximum residual disinfectant level.

"MTP" means maximum total trihalomethane potential.

"Monitoring assistance program" means the program established by A.R.S. § 49-360, under which a contractor provides for collection, transportation, and analysis of samples from a public water system under the provisions of R18-4-224 through R18-4-226.

"Nephelometric turbidity unit" means the unit of measure for turbidity. Turbidity is a measure of light scatter or absorption caused by suspended or colloidal matter in water. Turbidity is measured as an indicator of the effectiveness of filtration treatment.

"New public water system" means a public water system, as defined in A.R.S. § 49-352(B)(1), that is issued its first unique public water system identification number by the Department on or after October 1, 1999.

"Noncommunity water system" means a public water system that is either a nontransient, noncommunity water system or a transient, noncommunity water system.

"Nontransient, noncommunity water system" means a public water system that:

Serves 15 or more service connections that are used by the same persons for at least six months per year, or

Serves the same 25 or more persons for at least six months per year.

"NTNCWS" means nontransient, noncommunity water system.

"NTU" means nephelometric turbidity unit.

"Optimal corrosion control treatment" means the corrosion control treatment that minimizes lead and copper concentrations at the tap without violating any rule prescribed in this Chapter.

"OX" means chlorine or ozone oxidation.

"PCBs" means polychlorinated biphenyls.

"pCi" means picocurie.

"Picocurie" means the quantity of radioactive material producing 2.22 nuclear transformations per minute.

"Point-of-entry into the distribution system" means the point at which water is discharged into the distribution system from a well, storage tank, pressure tank, or water treatment plant.

"Point-of-entry treatment device" means a device that applies treatment to drinking water entering a house or building to reduce contaminants in the drinking water that is distributed throughout the house or building.

"Point-of-use treatment device" means a device that applies treatment to drinking water flowing to a single tap to reduce contaminants in the drinking water at that single tap.

"Pressure vacuum breaker assembly" means a backsiphonage prevention assembly that contains an independently operated, internally loaded check valve; an internally operated air-inlet valve located on the discharge side of the check valve; tightly closing resilient seated shut-off valves on each end of the check valve assembly; and properly located resilient seated test cocks.

"PTA" means packed tower aeration.

"Public water system" has the same meaning prescribed in A.R.S. § 49-352. A public water system is either a community water system; a nontransient, noncommunity water system; or a transient, noncommunity water system.

"Reduced pressure principle backflow-prevention assembly" means a backflow-prevention assembly that contains two independently acting check valves; a hydraulically operating, mechanically independent pressure differential relief valve located between the two check valves; tightly closing, resilient seated shut-off valves on each end of the check valve assembly; and properly located resilient seated test cocks.

"Rem" means the unit of dose equivalent from ionizing radiation to the total body or any internal organ or organ system.

"Repeat compliance period" means any compliance period after the initial compliance period.

"Residual disinfectant concentration" means the concentration of disinfectant measured in mg/L in a representative sample of water.

"Safe Drinking Water Act" means the federal Safe Drinking Water Act as amended (42 U.S.C. 300f et seq., Title XIV of the Public Health Service Act).

"Sanitary survey" means an onsite review of the water source, facilities, equipment, operation, and maintenance of a public water system to evaluate their adequacy to produce and distribute safe drinking water.

"Sedimentation" means a treatment process that holds water in a low-flow condition before filtration to remove solids by gravity or separation.

"Service connection" means a location at the meter or, in the absence of a meter, at the curbstop or at the building inlet.

"Service line" means the water line that runs from the corporation stop at a water main to the building inlet, including any pigtail, gooseneck, or fitting.

"Service line sample" means a one liter sample of water collected in accordance with R18-4-315(D).

"Single-family structure" means a building constructed as a single-family residence that is used as a residence or as a place of business.

"Slow sand filtration" means a treatment process that involves the passage of raw water through a bed of sand at low velocity, generally less than 0.4 m/h, and results in substantial particulate removal by physical and biological mechanisms.

"Small water system," for R18-4-306 through R18-4-316 only, means a public water system that serves 3,300 or fewer persons.

"SOC" means synthetic organic chemical.

"Source" means a body of water above or below the ground that supplies water to a public water system, including a well, spring, or surface water.

"Specific ultraviolet absorption" means an indicator of the humic content of a water at 254 nanometers (nm). It is a calculated parameter obtained by dividing a sample's ultraviolet absorption at a wavelength of 254 nm (UV₂₅₄ ) (in m^-1 ) by its concentration of dissolved organic carbon (DOC) (in mg/L).

"Standard sample" means the aliquot of finished drinking water that is examined for the presence of coliform bacteria. The standard sample volume is 100 milliliters.

"Surface water" means a source that is exposed to the unenclosed atmosphere and subject to surface runoff.

"Surface water system" means a public water system that uses surface water or groundwater under the direct influence of surface water, in whole or in part, as a source.

"SUVA" means specific ultraviolet absorption.

"Technical capacity" means the ability of a public water system to meet the requirements of R18-4-603 and the federal Safe Drinking Water Act at all times, and includes the ability to correct problems with its distribution, water quality, or source availability and to sustain compliance with its operations and maintenance plan.

"TNCWS" means transient, noncommunity water system.

"TOC" means total organic carbon.

"Total organic carbon" means total organic carbon in mg/L measured using heat, oxygen, ultraviolet irradiation, chemical oxidants, or combinations of these oxidants that convert organic carbon to carbon dioxide, rounded to two significant figures.

"Total trihalomethanes" means the sum of the concentrations of the following trihalomethane compounds: trichloromethane (chloroform), dibromochloromethane, bromo-dichloromethane, and tribromomethane (bromoform).

"Transient, noncommunity water system" means a public water system that:

Serves 15 or more service connections, but does not serve 15 or more service connections that are used by the same persons for more than six months per year; or

Serves an average of at least 25 persons per day for at least 60 days per year, but does not serve the same 25 persons for more than six months per year.

"Treatment" means a process that changes the quality of water by physical, chemical, or biological means.

"Treatment technique" means a treatment procedure promulgated by EPA in lieu of a MCL. Treatment techniques include the requirements for filtration, disinfection, lead, copper, acrylamide, and epichlorohydrin that are prescribed in Article 3 of this Chapter.

"Trihalomethane" means one of the family of organic compounds, named as derivatives of methane, in which three of four hydrogen atoms in methane are substituted by a halogen atom in the molecular structure.

"TTHM" means total trihalomethanes.

"Unit fee" means the amount charged to a public water system under the monitoring assistance program for a meter weight of 1 in accordance with R18-4-225.

"Virus" means an enteric virus that is infectious to humans by waterborne transmission.

"VOC" means volatile organic chemical.

"Water main" means a pipe used to distribute drinking water to more than one property and is exterior to buildings.

"Water supplier" means a person who owns, supervises, or directs the operation of a public water system.

"Waterborne disease outbreak" means the occurrence of illness that is epidemiologically associated with the ingestion of drinking water from a public water system.

"Water treatment plant" means a process, device, or structure used to improve the physical, chemical, or biological quality of the water in a public water system. A booster chlorination facility that is designed to maintain an effective disinfectant residual in water in the distribution system is not a water treatment plant.

Historical Note

Former Section R9-20-504 repealed, new Section R9-20-504 adopted effective November 1, 1979 (Supp. 79-6). Former Section R9-20-504 amended, renumbered as Section R9-20-501, then renumbered as Section R18-4-101 effective October 23, 1987 (Supp. 87-4). R18-4-101 recodified to R18-5-101 (Supp. 95-2). New Section adopted effective April 28, 1995 (Supp. 95-2). Amended effective June 3, 1998 (Supp. 98-3). Amended effective December 8, 1998 (Supp. 98-4). Amended by final rulemaking effective September 23, 1999; the A.A.R. citation was not available at the time of publication and will appear in Supp. 99-4 (Supp. 99-3). Amended by final rulemaking at 5 A.A.R. 4456, effective September 23, 1999 (Supp. 99-4). Amended by final rulemaking at 8 A.A.R. 973, effective February 19, 2002 (Supp. 02-1). Amended by final rulemaking at 8 A.A.R. 3046, effective May 1, 2002 (Supp. 02-3).

R18-4-102. Applicability

A. The rules in this Chapter apply to public water systems, unless a public water system:

1. Consists only of distribution and storage facilities and does not have collection or treatment facilities;

2. Obtains all of its water from, but is not owned or operated by, a public water system that is regulated under this Chapter;

3. Does not sell water to any person; and

4. Is not a carrier that conveys passengers in interstate commerce.

B. The rules in this Chapter do not apply to a public water system for a mobile home park that:

1. Consists only of distribution and storage facilities and does not have collection or treatment facilities;

2. Obtains all of its water from, but is not owned or operated by, a public water system that is regulated under this Chapter; and

3. Does not sell water to any person. For purposes of this subsection, submetering by a mobile home park to determine the quantity of water used by individual park tenants shall not be considered to be selling water, if the submetering is for the purpose of water conservation.

Historical Note

Adopted as Section R9-20-502 and renumbered as Section R18-4-102 effective October 23, 1987 (Supp. 87-4). R18-4-102 recodified to R18-5-102 (Supp. 95-2). New Section adopted effective April 28, 1995 (Supp. 95-2). Amended effective June 3, 1998 (Supp. 98-3). Amended by final rulemaking at 8 A.A.R. 973, effective February 19, 2002 (Supp. 02-1).

R18-4-103. Recordkeeping Requirements

A. A public water system shall retain on its premises or at a convenient location near its premises, the following records for the following minimum periods of time:

1. Records of bacteriological analyses, including records of analyses for total coliform, fecal coliform, Escherichia coli (E. coli), and heterotrophic bacteria for five years;

2. Records of chemical analyses for 10 years;

3. Records of actions taken by the public water system to correct a violation of this Chapter for three years after the last action taken to correct the violation;

4. Records concerning a variance or exemption granted to the public water system for five years after the expiration of the variance or exemption;

5. Copies of written reports, summaries, or communications relating to a sanitary survey of the public water system for 10 years after completion of the sanitary survey; and

6. Records of all sampling data and analyses, reports, surveys, letters, evaluations, schedules, Department determinations, and any other information required in R18-4-306 through R18-4-316 for 12 years.

7. A surface water system shall retain the following records for 10 years:

a. Records of turbidity measurements, including the number and percentage of filtered water turbidity measurements taken during the month that are less than or equal to the turbidity limits specified in R18-4-302 for the filtration technology used;

b. The date and value of any turbidity measurement taken during a month that exceeds 5 NTUs;

c. Records of the lowest residual disinfectant concentration (in mg/L) in water entering the distribution system for each day that each water treatment plant operates;

d. Records of the residual disinfectant concentration (in mg/L) in water for each sampling site in the distribution system; and

e. Records of analyses for heterotrophic bacteria if HPC is measured instead of residual disinfectant concentration in the distribution system.

8. A surface water system shall retain records of individual filter monitoring specified in R18-4-403 for three years.

9. A public water system shall retain copies of a public notice and a certification for three years after issuance.

B. A public water system shall keep the original laboratory reports of drinking water analyses or copies of Department-approved reporting forms.

Historical Note

Former Section R9-20-505 repealed, new Section R9-20-505 adopted effective November 1, 1979 (Supp. 79-6). Former Section R9-20-505 amended, renumbered as Section R9-20-503, then renumbered as Section R18-4-103 effective October 23, 1987 (Supp. 87-4). R18-4-103 recodified to R18-5-103 (Supp. 95-2). New Section adopted effective April 28, 1995 (Supp. 95-2). Amended effective June 3, 1998 (Supp. 98-3). Amended by final rulemaking at 8 A.A.R. 973, effective February 19, 2002 (Supp. 02-1). Amended by final rulemaking at 8 A.A.R. 3046, effective May 1, 2002 (Supp. 02-3).

R18-4-104. Reporting Requirements

A. Routine monitoring. Except as specified in this subsection, a public water system or a contractor shall report the result of any test measurement or analysis required by Article 2 to the Department within 10 days after the end of the month in which the public water system receives the analytical result or within 10 days after the end of an applicable monitoring period prescribed by Article 2, whichever occurs first.

1. Fecal coliform or E coli: If any routine or repeat sample for total coliform is positive, the public water system shall have the total coliform-positive sample analyzed to determine whether fecal coliforms are present, except that the public water system may test for E. coli instead of fecal coliforms. If fecal coliforms or E. coli are present in a total coliform-positive sample, the public water system shall report the positive results to the Department, by telephone or facsimile, as soon as possible but no later than 24 hours after receipt of the fecal coliform-positive or E. coli-positive test result.

2. Nitrate: If a monitoring result is greater than the MCL for nitrate in a routine sample, the public water system shall take a confirmation sample within 24 hours of receipt of the analytical results. The public water system shall report the MCL exceedance to the Department by telephone or facsimile, as soon as possible but no later than 24 hours after receipt of the analytical results.

3. Total trihalomethanes: A public water system shall report the arithmetic average of analytical results for total trihalomethanes within 30 days of receipt of the last analytical results of the previous quarter.

4. Disinfection byproducts, disinfectant residuals, disinfection byproduct precursors and enhanced coagulation or enhanced softening: The following results shall be reported as specified by the time-frame under subsection (A).

a. Disinfection byproducts. A CWS, NTNCWS, or TNCWS shall report the information specified in Table 1:

Table 1. Reporting Requirements for Disinfection Byproducts

IF YOU ARE A...	YOU MUST REPORT...
A. System monitoring for TTHMs and HAA5 under the requirements of R18-4-214.01 or R18-4-214.02 on a quarterly or more frequent basis	1. The number of samples collected during the last quarter. 2. The location, date, and result of each sample collected during the last quarter. 3. The arithmetic average of all samples collected in the last quarter. 4. The annual arithmetic average of the quarterly arithmetic averages for the last four quarters. 5. Whether, based on R18-4-214.01(I)(3) or R18-4-214.02(H)(3), the MCL was violated.
B. System monitoring for TTHMs and HAA5 under the requirements of R18-4-214.01 or R18-4-214.02 less frequently than quarterly (but at least annually)	1. The number of samples collected during the last year. 2. The location, date, and result of each sample collected during the last monitoring period. 3. The arithmetic average of all samples collected over the last year. 4. Whether, based on R18-4-214.01(I)(3) or R18-4-214.02(H)(3), the MCL was violated.
C. System monitoring for TTHMs and HAA5 under the requirements of R18-4-214.01 or R18-4-214.02 less frequently than annually	1. The location, date, and result of the last sample collected. 2. Whether, based on, R18-4-214.01(I)(3) or R18-4-214.02(H)(3), the MCL was violated.
D. System monitoring for chlorite under the requirements of R18-4-214.01 or R18-4-214.02	1. The number of entry point samples collected each month for the last three months. 2. The location, date, and result of each sample (both point-of-entry into the distribution system and in the distribution system) collected during the last quarter. 3. For each month in the reporting period, the arithmetic average of all samples collected in each set of three samples collected in the distribution system. 4. Whether, based on R18-4-214.01(I)(5) or R18-4-214.02(H)(5), the MCL was violated, in which month, and how many times it was violated each month.
E. System monitoring for bromate under the requirements of R18-4-214.01 or R18-4-214.02	1. The number of samples collected during the last quarter. 2. The location, date, and result of each sample collected during the last quarter. 3. The arithmetic average of the monthly arithmetic averages of all samples collected in the last year. 4. Whether, based on R18-4-214.01(I)(4) or R18-4-214.02(H)(4), the MCL was violated.

b. Disinfectant Residuals. A CWS, NTNCWS, or TNCWS shall report the information specified in Table 2:

Table 2. Reporting Requirements for Disinfection Residuals

IF YOU ARE A...

YOU MUST REPORT...

A. System monitoring for chlorine or chloramines under the requirements of R18-4-214.01 or R18-4-214.02

1. The number of samples collected during each month of the last quarter.

2. The monthly arithmetic average of all samples collected in each month for the last 12 months.

3. The arithmetic average of all monthly averages for the last 12 months.

4. Whether, based on R18-4-214.01(K)(2) or R18-4-214.02(J)(2), the MRDL was violated.

B. System monitoring for chlorine dioxide under the requirements of R18-4-214.01 or R18-4-214.02

1. The dates, results, and locations of samples collected during the last quarter.

2. Whether, based on R18-4-214.01(K)(3) or R18-4-214.02(J)(3), the MRDL was violated.

3. Whether the MRDL was exceeded in any two consecutive daily samples and whether the resulting violation required an Acute or Nonacute Level 1 public notice.

c. Disinfection byproduct precursors and enhanced coagulation or enhanced softening. A CWS or NTNCWS shall report the information specified in Table 3:

Table 3. Reporting Requirements for Disinfection Byproduct Precursors and Enhanced Coagulation or Enhanced Softening

IF YOU ARE A...	YOU MUST REPORT...
A. System monitoring monthly or quarterly for TOC and alkalinity under the requirements of R18-4-214.01 or R18-4-214.02 and required to meet the enhanced coagulation or enhanced softening requirements in R18-4-301.02	1. The number of sample sets (source water TOC and alkalinity and treated water TOC) collected during the last quarter. 2. The location, date, and results of each sample set collected during the last quarter. 3. For each month in the reporting period that sample sets were collected, the monthly arithmetic average of the percent removal of TOC and the required TOC percent removal. 4. Calculations for determining compliance with the TOC percent removal requirements, as provided in R18-4-301.02(D). 5. Whether the system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements in R18-4-301.02(C) for the last four quarters.
B. System monitoring monthly or quarterly for TOC under the requirements of R18-4-214.01 or R18-4-214.02 and meeting one or more of the alternative compliance criteria in R18-4-301.02(A)(1)-(8)	1. The alternative compliance criterion that the system is using. 2. The number of sample sets (source water TOC and alkalinity and treated water TOC) collected during the last quarter. 3. The location, date, and result of each sample set collected during the last quarter. 4. The running annual arithmetic average based on monthly averages or quarterly samples of source water TOC for systems meeting a criterion in R18-4-301.02(A)(1) or (8) or of treated water TOC for systems meeting the criterion in R18-4-301.02(A)(2). 5. The running annual arithmetic average based on monthly averages or quarterly samples of source water SUVA for systems meeting the criterion in R18-4-301.02(A)(4) or of treated water SUVA for systems meeting the criterion in R18-4-301.02(A)(5). 6. The running annual average of source water alkalinity for systems meeting the criterion in R18-4-301.02(A)(8) and of treated water alkalinity for systems meeting the criterion in R18-4-301.02(A)(6).
	7. The running annual average for both TTHM and HAA5 for systems meeting the criterion in R18-4-301.02(A)(3) or (8). 8. The running annual average of the amount of magnesium hardness removal (as CaCO₃ , in mg/L) for systems meeting the criterion in R18-4-301.02(A)(7). 9. Whether the system is in compliance with the particular alternative compliance criterion in R18-4-301.02(A)(1) through (8).

B. MCL and MRDL violations: Except as specified in this subsection, a public water system shall report a violation of a MCL or MRDL to the Department within 48 hours of receipt of analytical results that indicate a violation.

1. A public water system shall report a violation of the MCL for total coliform to the Department, by telephone or facsimile, as soon as possible but no later than 24 hours after receipt of analytical results that indicate a violation.

2. A public water system shall report a violation of the MCL for nitrate or nitrite to the Department, by telephone or facsimile, as soon as possible but no later than 24 hours after receipt of analytical results for the confirmation sample that confirms a violation.

3. A public water system shall report a violation of an interim MCL for turbidity to the Department, by telephone or facsimile:

a. Within 10 days after the end of the month if the arithmetic average of the analytical results of daily samples taken during the month exceeds one NTU.

b. Within 24 hours of receipt of analytical results for the second daily sample if the arithmetic average of the results of daily samples collected on two consecutive days exceeds 5 NTUs.

4. A water supplier shall report an acute violation of the chlorine dioxide MRDL, as specified in R18-4-214.01(K)(3)(a) and R18-4-214.02(J)(3)(a), to the Department, by phone or facsimile as soon as possible but no later than 24 hours after receipt of analytical results that indicate an acute violation.

C. Filtration. Except as provided in subsection (C)(4), a surface water system that provides filtration shall report the following turbidity measurements to the Department within 10 days after the end of each month for each water treatment plant that operates during the month:

1. The total number of filtered water turbidity measurements taken during the month,

2. The number and percentage of filtered water turbidity measurements taken during the month that are less than or equal to the turbidity limits prescribed in R18-4-302 for the filtration technology used, and

3. The date and value of a filtered water turbidity measurement collected during the month that exceeds the maximum turbidity limits specified in R18-4-302 for the filtration technology used.

4. If the turbidity of the filtered water exceeds the maximum turbidity limits specified in R18-4-302 for the filtration technology used, then the surface water system shall report the exceedance to the Department, by telephone or facsimile, as soon as possible but no later than 24 hours after the exceedance.

D. Disinfection. Except as provided in subsection (D)(4), a surface water system that provides disinfection shall report the following information to the Department within 10 days after the end of each month for each water treatment plant that operates during the month:

1. For each day, the lowest measurement of residual disinfectant concentration in mg/L in water entering the distribution system;

2. The date and duration of each period the residual disinfectant concentration in water entering the distribution system fell below 0.2 mg/L; and

3. The value of "V" calculated by the formula prescribed in R18-4-303(C)(2) for the current and previous month.

4. If the residual disinfectant concentration falls below 0.2 mg/L in water entering the distribution system, the surface water system shall report the occurrence to the Department as soon as possible but no later than 24 hours after the occurrence. The surface water system shall report whether the residual disinfectant concentration was restored to at least 0.2 mg/L within four hours.

E. Tap water monitoring for lead and copper. A public water system that monitors for lead and copper under R18-4-310 or R18-4-313 shall report the following information to the Department within 10 days after the end of the monitoring period:

1. The results of all tap water samples, the location of each sample site, and the criteria specified in either R18-4-309(A)(1), or R18-4-309(A)(2), or both, used to select the site for the system's sampling pool.

2. The 90th percentile lead and copper concentrations for all lead and copper tap water samples collected during each monitoring period (as calculated in accordance with R18-4-308), unless the Department notifies the public water system that the Department will calculate the 90th percentile lead and copper concentrations and will notify the public water system of the 90th percentile concentrations.

3. Identification of all non-first-draw sample sites selected by the public water system and the length of the standing time for each substitute sample collected according to R18-4-310(D)(3).

4. A list of sampling sites that were not sampled in the previous monitoring period and an explanation for the change in sampling sites.

5. The results of any tap water samples collected in addition to the minimum required in R18-4-310 and R18-4-313.

6. Documentation of all lead and copper tap water samples for which the public water system requests invalidation under R18-4-310(P).

F. Corrosion control treatment. A public water system that is required under R18-4-313(A) to install optimal corrosion control treatment, shall submit a letter to the Department certifying that the public water system has completed installation of the optimal corrosion control treatment. The public water system shall submit the certification within 24 months after the date the Department designates the treatment.

G. Water quality parameter monitoring. A public water system that monitors for water quality parameters at the tap or source under R18-4-311 or R18-4-313 shall report the results of all water quality parameter samples to the Department within 10 days after the end of the monitoring period. The public water system shall also report the results of any water quality parameter samples collected in addition to the minimum required in R18-4-311 and R18-4-313.

H. Source water monitoring for lead and copper. A public water system that monitors source water for lead and copper under R18-4-314 shall report the following information to the Department within 10 days after the end of the monitoring period:

1. The results of all source water samples,

2. A list of sampling points that were not sampled in the previous monitoring period and an explanation for the change in sampling points, and

3. The results of any source water samples collected in addition to the minimum required in R18-4-314.

I. Source water treatment. A public water system shall report the following information to the Department within the following minimum time periods:

1. Within six months after a public water system exceeds the action level for lead or copper, the public water system shall submit a letter to the Department that makes a recommendation regarding installation and operation of source water treatment. If the public water system demonstrates that source water treatment is not necessary to minimize lead or copper levels at taps, the public water system may recommend that no source water treatment be installed.

2. If the Department determines that source water treatment is necessary under R18-4-314(E), the public water system shall submit a letter that certifies that the public water system has installed the source water treatment designated or approved by the Department within 24 months after receipt of a written determination by the Department that source water treatment is necessary.

J. Lead service line replacement. A public water system that is required to replace lead service lines under R18-4-315 shall report the following information to the Department:

1. A public water system that exceeds the action level for lead after installation of either corrosion control, or source water treatment, or both, shall, within 12 months after the public water system exceeds the action level for lead:

a. Conduct a materials survey and include the information required in the initial materials survey conducted under R18-4-309(B) to identify the initial number of lead service lines in its distribution system;

b. Submit a report to the Department that contains the results of the materials survey and a schedule for the annual replacement of at least 7% of the initial number of lead service lines in its distribution system; and

c. Submit a letter to the Department that demonstrates that the public water system has either:

i. Replaced at least 7% of the initial number of lead service lines or a greater percentage of lead service lines specified by the Department under R18-4-315(F) in the previous 12 months, or

ii. Conducted sampling that demonstrates that the lead concentration in all lead service line samples collected under R18-4-315(D) from an individual service line are less than or equal to 0.015 mg/L. If the public water system conducted lead monitoring of individual lead service lines, the letter shall document the number of lead service lines with lead concentrations that are less than or equal to 0.015 mg/L and the number of lead service lines replaced. The total number of lead service lines with lead concentrations that are less than or equal to 0.015 mg/L plus the number of lead service lines replaced shall equal at least 7% of the initial number of lead service lines or the larger percentage specified by the Department under R18-4-315(F).

2. The public water system shall submit an annual letter to the Department that contains the following information:

a. The information required in subsections (J)(1)(c)(i) and (J)(1)(c)(ii), as applicable;

b. The number of lead service lines scheduled to be replaced during the previous year of the system's lead service line replacement program;

c. The number and location of each lead service line replaced during the previous year of the system's lead service line replacement program;

d. If measured, the lead concentration and location of each lead service line sampled, the sampling method, and the date of sampling; and

e. Certification that all partial lead service line replacement activities required in R18-4-315(E) have been completed, if applicable.

K. Special monitoring. A public water system, or a contractor that conducts special monitoring required in Article 4, shall report the following information to the Department:

1. For sodium required in R18-4-401, the sodium monitoring results within 10 days after the end of the month in which the public water system receives the analytical results.

2. For nickel required in R18-4-402, the nickel monitoring results within 10 days after the end of the month in which the public water system receives the analytical result or within 10 days after the end of an applicable monitoring period prescribed by R18-4-402, whichever occurs first.

3. For turbidity monitoring under R18-4-403.

a. A system shall report within 10 days after the end of each month the system served water to the public that the continuous turbidity monitoring was conducted.

b. A system shall report the continuous turbidity measurements within 10 days after the end of each month the system served water to the public only if measurements demonstrate one or more conditions in R18-4-403(A)(3) through (6). The following information shall be reported:

i. The filter number, the turbidity measurement, the date(s) on which the turbidity limit was exceeded.

ii. If the system is required to produce a filter profile, the system shall report that the filter profile has been produced, or report the obvious reason for the abnormal filter performance.

iii. If the system is required to conduct a filter self-assessment, the system shall report that the filter self-assessment has been conducted.

iv. If the system is required to arrange for a comprehensive performance evaluation, the evaluation shall be completed and submitted to the Department no later than 90 days following the exceedance.

L. Failure to comply with monitoring requirements. A public water system shall report the failure to comply with any monitoring requirement prescribed in this Chapter, including a monitoring requirement covered by the monitoring assistance program in this Chapter, to the Department within 48 hours, except that a public water system that fails to comply with a total coliform monitoring requirement shall report the monitoring violation to the Department within 10 days after discovery.

M. Cross connection incidents. A public water system shall submit a written cross connection incident report to the Department and the local county health department within five days of the occurrence of a cross connection problem that results in contamination of water provided by the public water system. The report shall address all of the following:

1. Date and time of discovery of the cross connection incident,

2. Nature of the cross connection incident,

3. Affected area,

4. Cause of the cross connection incident,

5. Public health impact,

6. Date and text of any public health advisory issued,

7. Corrective action taken, and

8. Date of completion of corrective action.

N. Emergencies. A public water system shall notify the Department, by telephone or facsimile, as soon as possible but no later than 24 hours after the occurrence of any of the following emergencies:

1. Loss of water supply from a source;

2. Loss of water supply due to major component failure;

3. Damage to power supply equipment or loss of power;

4. Contamination of water in the distribution system from backflow;

5. Collapse of a reservoir, reservoir roof, or pumphouse structure;

6. Break in a transmission or distribution line that results in a loss of service to customers for more than four hours; and

7. Chemical or microbiological contamination of the water supply.

O. Waterborne disease outbreak. A public water system shall report to the Department the occurrence of a waterborne disease outbreak that may be attributable to water provided by the public water system as soon as possible but no later than 24 hours after actual notice of the waterborne disease outbreak.

P. Confirmation sample results. A public water system shall report the analytical results of any confirmation sample required by the Department, except a confirmation sample obtained by a contractor under the monitoring assistance program, within 24 hours after receipt of the analytical results.

Q. Copies of public notices. A public water system shall submit to the Department within 10 days after the date of completion of a public notice, a representative copy of each type of public notice required in R18-4-105 and R18-4-105.01 that is distributed, published, posted, or made available to persons served by the public water system or to the media and an affidavit that describes how the public notice was provided.

R. Department requests for records. A public water system shall submit to the Department, within the time stated in the request, copies of any records that the public water system maintains under R18-4-103 or copies of any documents that the Department is entitled to inspect under 42 U.S.C. 300j-4 (2001).

S. Department reporting forms. A public water system shall report to the Department the results of all analyses completed under this Chapter on Department-approved forms.

T. Direct reporting. A public water system may contract with a laboratory or another agent to report monitoring results to the Department, but the public water system remains legally responsible for compliance with reporting requirements.

U. Reporting limits. A public water system shall not report an analytical result as "not detected" or "ND" without a specific reference to a numeric "less than value" [that is, "< x" where x is a numeric concentration]. A public water system shall not report a "less than value" at a concentration that exceeds any of the following reporting limits:

1. Single point-of-entry sample:

a. Inorganic chemicals (except nitrate, nitrite, fluoride, lead and copper): The reporting limit is the MCL for the inorganic chemical.

b. Nitrate: 5 mg/L.

c. Nitrite: 0.5 mg/L.

d. Fluoride: 2.0 mg/L.

e. VOCs: 0.0005 mg/L.

f. SOCs:

Synthetic Organic Chemical	Reporting Limit [in mg/L]
Alachlor	0.0002
Atrazine	0.0001
Benzo(a)pyrene	0.00002
Carbofuran	0.0009
Chlordane	0.0002
2,4-D	0.0001
Dalapon	0.001
Dibromochloropropane (DBCP)	0.00002
Di(2-ethylhexyl)adipate	0.0006
Di(2-ethylhexyl)phthalate	0.0006
Dinoseb	0.0002
Diquat	0.0004
Endothall	0.009
Endrin	0.00001
Ethylene dibromide (EDB)	0.00001
Glyphosate	0.006
Heptachlor	0.00004
Heptachlor epoxide	0.00002
Hexachlorobenzene	0.0001
Hexachlorocyclopentadiene	0.0001
Lindane	0.00002
Methoxychlor	0.0001
Oxamyl	0.002
PCBs (as decachlorbiphenyl)	0.0001
Pentachlorophenol	0.00004
Picloram	0.0001
Simazine	0.00007
2,3,7,8-TCDD (Dioxin)	0.000000005
Toxaphene	0.001
2,4,5-TP (Silvex)	0.0002

2. Composite samples:

a. Inorganic chemicals (except lead and copper): The reporting limit is 1/5 of the MCL for the inorganic chemical.

b. VOCs: 0.0005 mg/L.

c. SOCs: The reporting limit for a SOC composite sample is the same as the reporting limit for a SOC single sample listed under subsection (U)(1)(f), except for toxaphene, which has a reporting limit that is less than or equal to 0.0006 mg/L.

3. Radiochemical reporting limits: The reporting limit for a radiochemical shall be that concentration that can be counted with a precision of plus or minus 100% at the 95% confidence level (1.96 F where F is the standard deviation of the net counting rate of the sample).

a. Radium-226: 1 pCi/L.

b. Radium-228: 1 pCi/L.

c. Gross alpha particle activity: 3 pCi/L.

d. Man-made beta particle and photon emitters:

	Man-made Beta Particle and Photon Emitters	Reporting Limit
i.	Tritium	1,000 pCi/L
ii.	Strontium-89	10 pCi/L
iii.	Strontium-90	2 pCi/L
iv.	Iodine-131	1 pCi/L
v.	Cesium-134	10 pCi/L
vi.	Gross beta	4 pCi/L
vii.	Other radionuclides	1/10 of the applicable limit

4. Lead and copper reporting limits:

A public water system shall report all lead levels measured between 0.005 mg/L and the method detection limit as measured or as 0.0025 mg/L. A public water system shall report all copper levels measured between 0.050 mg/L and the method detection limit as measured or as 0.025 mg/L. A public water system shall report all lead and copper levels measured below the method detection limits for lead and copper as zero.

V. Failure to comply with any of the provisions of this Chapter. A public water system shall report the failure to comply with any of the provisions of this Chapter to the Department within 48 hours, except where a different reporting period is specified in this Section.

Historical Note

Former Section R9-20-506 repealed, new Section R9-20-506 adopted effective November 1, 1979 (Supp. 79-6). Amended effective March 19, 1980 (Supp. 80-2). Former Section R9-20-506 amended, renumbered as Section R9-20-504, then renumbered as Section R18-4-104 effective October 23, 1987 (Supp. 87-4). R18-4-104 recodified to R18-5-104 (Supp. 95-2). New Section adopted effective April 28, 1995 (Supp. 95-2). Amended effective June 3, 1998 (Supp. 98-3). Amended effective December 8, 1998 (Supp. 98-4). Amended by final rulemaking at 8 A.A.R. 973, effective February 19, 2002 (Supp. 02-1). Amended by final rulemaking at 8 A.A.R. 3046, effective May 1, 2002 (Supp. 02-3). Amended under R1-1-109(B) to correct a manifest clerical error; subsection R18-4-104(J)(3) moved to its proper place as subsection R18-4-104(K)(3); compare at 8 A.A.R. 3086, July 26, 2002 (Supp. 03-1).

R18-4-105. Public Notification Requirements (Effective May 6, 2002)

A. A public water system shall give public notice for all violations of this Chapter and for the following situations:

1. Operation under a variance or an exemption,

2. Failure to comply with the requirements of a schedule that is set under a variance or exemption,

3. Occurrence of a waterborne disease outbreak or other waterborne emergency as identified in Table 2 item 10,

4. Distributing water with a concentration of fluoride greater than 2.0 mg/L but less than 4.0 mg/L, and

5. Availability of data from unregulated contaminant monitoring required by 40 CFR 141.40.

B. Public notice requirements are divided into three categories, to take into account the seriousness of the violation or situation and of any potential adverse health effects that may be involved. Table 1 provides the public notice categories. Appendix A identifies the public notice requirement for a specific violation or situation.

Table 1. Public Notice Categories

1. Acute (24 hour) public notice - required for violations and situations with significant potential to have serious adverse effects on human health as a result of short-term exposure.

2. Nonacute Level 1 (30 day) public notice - required for violations and situations with potential to have serious adverse effects on human health, but not as a result of short-term exposure.

3. Nonacute Level 2 (12 month) public notice - required for all other violations and situations not included in Acute (24 hour) and Nonacute Level 1 (30 day) public notice.

C. A public water system shall provide public notice to persons served by the system, in accordance with this Section.

1. A public water system that sells or otherwise provides drinking water to a consecutive system is required to give public notice to the consecutive system. The consecutive system is responsible for providing public notice to the persons it serves.

2. A public water system that has a violation in a portion of the distribution system that is physically or hydraulically isolated from other parts of the distribution system may request that the Department allow the system to limit distribution of the public notice to persons served by that portion of the system that is out of compliance. The Department's decision to allow limited distribution of the notice shall be in writing.

3. The Department may provide public notice on behalf of the public water system. A public water system remains legally responsible for ensuring that the requirements are met.

D. Acute (24 hour) Public Notice

1. Table 2 lists the violations and other situations requiring an Acute (24 hour) public notice.

Table 2. Violations and Other Situations Requiring an Acute (24 hour) Public Notice

1. Violation of the MCL for total coliforms when fecal coliform or E. coli are present in the water distribution system, as specified in R18-4-202(A)(3) or R18-4-202(A)(4);

2. Failure to test for fecal coliforms or E. coli when a repeat sample tests positive for total coliform;

3. Violation of the MCL for nitrate, nitrite, or total nitrate and nitrite in R18-4-205;

4. Failure to take a confirmation sample within 24 hours of the system's receipt of the initial sample showing a violation of the nitrate or nitrite MCL, as specified in R18-4-208(I) and R18-4-209(K);

5. Violation of the nitrate MCL by a nonc