Environmental Quality

Drinking Water

Rule 200: Monitoring and Water Quality: Drinking Water Standards

Effective Date: 09/01/2026

Admin. Code Reference: R309-200

Rule Type: Superseded Rule

NOTICE OF SUBSTANTIVE CHANGE

TYPE OF FILING: Amendment

Filing ID: 58026

Rule or section number:

R309-200-5

1. Agency Information

Title catchline:

Environmental Quality, Drinking Water

Building:

Multi-Agency State Office Buildings

Street address:

195 N 1950 W

City, state:

Salt Lake City, UT 84116

Mailing address:

PO Box 144830

City, state and zip:

Salt Lake City, UT 84114-4830

2. Contact Persons

Name:

Phone:

Email:

Sarah Romero-Rivera

801-896-8255

sarahromero@utah.gov

Mimi Ujiie

385-303-0581

mujiie@utah.gov

Mark Berger

801-641-6457

mberger@utah.gov

Please address questions regarding information on this notice to the persons listed above.

3. General Information

A. Rule or section catchline:

R309-200-5. Primary Drinking Water Standards

B. Purpose of the new rule or reason for the change:

The amendments to Subsection R309-200-5(2) are to align this rule's definition of "Action level" to changes being proposed to Section R309-210-6.

C. Summary of the new rule or change:

The Division of Drinking Water is updating Subsection R309-200-5 (2) to match the new lead exceedances proposed in Section R309-210-6.

(EDITOR'S NOTE: The proposed amendments to Rule R309-210 is under ID 58027 in this issue, June 15, 2026, of the Bulletin.)

5. Fiscal Information

Provide an estimate and written explanation of the aggregate anticipated cost or savings to:

A. State budget:

There is no expected cost to the state budget as a direct result of the changes in this rule.

The amendments align this rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

B. Local governments:

There is no expected cost to the local governments as a direct result of the changes in this rule.

The amendments align this rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

C. Small businesses ("small business" means a business employing 1-49 persons):

There is no expected cost to small businesses as a direct result of the changes in this rule.

The amendments align this rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

D. Non-small businesses ("non-small business" means a business employing 50 or more persons):

There is no expected cost to the non-small businesses as a direct result of the change in this rule.

The amendments align this rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

E. Persons other than small businesses, non-small businesses, state, or local government entities ("person" means any individual, partnership, corporation, association, governmental entity, or public or private organization of any character other than an agency):

There is no expected cost to persons other than small businesses, non-small businesses, state, or local government entities as a direct result of the changes in this rule.

The amendments align this rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

F. Compliance costs for affected persons:

There is no expected compliance cost to the affected persons as a direct result of the changes in this rule.

The amendments align this Rule with Rule R309-210, and any possible cost or savings have already been captured within the fiscal analysis for that rule.

6. Regulatory Impact Summary Table

Enter the cost or savings in the relevant cell. If there is no cost or savings, enter, "$0." If a cost or savings is inestimable, enter, "inestimable."

Fiscal Cost

FY2027

FY2028

FY2029

FY2030

FY2031

State Budget

Local Governments

Small Businesses

Non-Small Businesses

Other Persons

Total Fiscal Cost

Fiscal Benefits

FY2027

FY2028

FY2029

FY2030

FY2031

State Budget

Local Governments

Small Businesses

Non-Small Businesses

Other Persons

Total Fiscal Benefits

Net Fiscal Benefits

7. Regulatory Impact Analysis Approval

The Commissioner of the Department of Environmental Quality, Tim Davis, has reviewed and approved this regulatory impact analysis.

8. Family Impact Information

A. The agency has considered this rule's impact on family health, stability, and formation:

☒

9. Citation Information

Provide citations to the statutory authority for the rule. If there is also a federal requirement for the rule, provide a citation to that requirement:

Subsection 19-4-104(1)

40 CFR142 (2025)

40 CFR 141 Subpart I (2025)

11. Public Notice Information

The public may submit written or oral comments to the agency identified in box 1.

A. Comments will be accepted until:

07/15/2026

12. Effective Date Information

This rule change MAY become effective on:

(NOTE: This is the date the agency anticipates making the filing effective. It is NOT the effective date)

07/22/2026

13. Agency Authorization Information

Agency head or

designee and title:

Tim Davis, Commissioner

Date:

06/01/2026

R309. Environmental Quality, Drinking Water.

R309-200. Monitoring and Water Quality: Drinking Water Standards.

R309-200-5. Primary Drinking Water Standards.

(1) Inorganic Contaminants.

(a) The maximum contaminant levels (MCLs) for antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, selenium, sodium, thallium and total dissolved solids are applicable to community and non-transient non-community water systems.

(b) The MCLs for nitrate, nitrite, and total nitrate, nitrite and sulfate are applicable to community, non-transient non-community, and transient non-community water systems.

TABLE 200-1

PRIMARY INORGANIC CONTAMINANTS

Contaminant Maximum Contaminant Level

1. Antimony 0.006 mg/L

2. Arsenic 0.010 mg/L

(see Note 5 below)

3. Asbestos 7 Million Fibers/liter

(longer than 10 um)

4. Barium 2 mg/L

5. Beryllium 0.004 mg/L

6. Cadmium 0.005 mg/L

7. Chromium 0.1 mg/L

8. Cyanide (as free Cyanide) 0.2 mg/L

9. Fluoride 4.0 mg/L

10. Mercury 0.002 mg/L

11. Nickel --- (see Note 1 below)

12. Nitrate 10 mg/l (as Nitrogen)

(see Note 4 below)

13. Nitrite 1 mg/L (as Nitrogen)

14. Total Nitrate and Nitrite 10 mg/L (as Nitrogen)

15. Selenium 0.05 mg/L

16. Sodium --- (see Note 1 below)

17. Sulfate 1000 mg/L (see Note 2 below)

18. Thallium 0.002 mg/L

19. Total Dissolved Solids 2000 mg/L (see Note 3 below)

NOTE:

(1) No maximum contaminant level has been established for

nickel and sodium. However, these contaminant shall be monitored

and reported in accordance with the requirements of R309-205-5(3).

(2) If the sulfate level of a public (community, NTNC and

non-community) water system is greater than 500 mg/L, the supplier

shall satisfactorily demonstrate that:

(a) No better quality water is available, and

(b) The water shall not be available for human consumption

from commercial establishments.

In no case shall the Director allow the use of water having a

sulfate level greater than 1000 mg/L.

(3) If TDS is greater than 1000 mg/L, the supplier shall

satisfactorily demonstrate to the Director that no better water

is available. The Director shall not allow the use of an inferior

source of water if a better source of water (i.e. lower in TDS)

is available.

(4) In the case of a non-community water systems which

exceed the MCL for nitrate, the Director may allow,

on a case-by-case basis, a nitrate level not to exceed 20 mg/L if

the supplier can adequately demonstrate that:

(a) such water will not be available to children under 6

months of age as may be the case in hospitals, schools and day

care centers; and

(b) there will be continuous posting of the fact that nitrate

levels exceed 10 mg/L and the potential health effect of exposure

in accordance with R309-220-12; and

R309-205-5(4); and

(d) that no adverse health effects will result.

(5) The maximum contaminant level for arsenic is 0.05 mg/L

until January 23, 2006. The MCL of 0.010 mg/L is effective for the

purposes of compliance on January 23, 2006.

(2) The lead and copper action levels are defined as follows:[Lead and copper.]

(a) Until October 31, 2027, t[T]he lead action level is exceeded if the concentration of lead in more than 10%[ percent] of tap water

samples collected during any monitoring period conducted in accordance with Section R309-210-6[(3)] is greater than 0.015 mg/L, as an example,[

(i.e.,] if the "90th percentile" lead level is greater than 0.010[5] mg/L.[).]

(b) Starting on November 1, 2027, the lead action level is exceeded if the concentration of lead in more than 10% of tap water samples

collected during any monitoring period conducted in accordance with Section R309-210-6 is greater than 0.010 mg/L, as an example, if the "90th

percentile" lead level is greater than 0.010 mg/L.

(c)[(b)] The copper action level is exceeded if the concentration of copper in more than 10%[ percent] of tap water samples collected

during any monitoring period conducted in accordance with Section R309-210-6[(3)] is greater than 1.3 mg/L, as an example,[ (i.e.,] if the "90th

percentile" copper level is greater than 1.3 mg/L.[).]

(d)[(c)] The 90th percentile lead and copper levels shall be computed [as follows:]per Section R309-210-6.

[(i) The results of all lead or copper samples taken during a monitoring period shall be placed in ascending order from the sample with the

lowest concentration to the sample with the highest concentration. Each sampling result shall be assigned a number, ascending by single integers

beginning with the number 1 for the sample with the lowest contaminant level. The number assigned to the sample with the highest contaminant

level shall be equal to the total number of samples taken.

(ii) The number of samples taken during the monitoring period shall be multiplied by 0.9.

(iii) The contaminant concentration in the numbered sample yielded by the calculation in paragraph (c)(ii) above is the 90th percentile

contaminant level.

(iv) For water systems serving fewer than 100 people that collect 5 samples per monitoring period, the 90th percentile is computed by

taking the average of the highest and second highest concentrations.

(v) For a public water system that has been allowed by the Director to collect fewer than five samples in accordance with R309-210-

6(3)(c), the sample result with the highest concentration is considered the 90th percentile value.]

(3) Organic Contaminants.

The following are the maximum contaminant levels for organic chemicals. For the purposes of R309-100 through R309-R309-605, organic chemicals are divided into three categories: Pesticides/PCBs/SOCs, volatile organic contaminants (VOCs) and total trihalomethanes.

(a) Pesticides/PCBs/SOCs - The MCLs for organic contaminants listed in Table 200-2 are applicable to community water systems and non-transient, non-community water systems.

TABLE 200-2

PESTICIDE/PCB/SOC CONTAMINANTS

Contaminant Maximum Contaminant Level

1. Alachlor 0.002 mg/L

2. Aldicarb (see Note 1 below)

3. Aldicarb sulfoxide (see Note 1 below)

4. Aldicarb sulfone (see Note 1 below)

5. Atrazine 0.003 mg/L

6. Carbofuran 0.04 mg/L

7. Chlordane 0.002 mg/L

8. Dibromochloropropane 0.0002 mg/L

9. 2,4-D 0.07 mg/L

10. Ethylene dibromide 0.00005 mg/L

11. Heptachlor 0.0004 mg/L

12. Heptachlor epoxide 0.0002 mg/L

13. Lindane 0.0002 mg/L

14. Methoxychlor 0.04 mg/L

15. Polychlorinated biphenyls 0.0005 mg/L

16. Pentachlorophenol 0.001 mg/L

17. Toxaphene 0.003 mg/L

18. 2,4,5-TP 0.05 mg/L

19. Benzo(a)pyrene 0.0002 mg/L

20. Dalapon 0.2 mg/L

21. Di(2-ethylhexyl)adipate 0.4 mg/L

22. Di(2-ethylhexyl)phthalate 0.006 mg/L

23. Dinoseb 0.007 mg/L

24. Diquat 0.02 mg/L

25. Endothall 0.1 mg/L

26. Endrin 0.002 mg/L

27. Glyphosate 0.7 mg/L

28. Hexachlorobenzene 0.001 mg/L

29. Hexachlorocyclopentadiene 0.05 mg/L

30. Oxamyl (Vydate) 0.2 mg/L

31. Picloram 0.5 mg/L

32. Simazine 0.004 mg/L

33. 2,3,7,8-TCDD (Dioxin) 0.00000003 mg/L

Note 1: The MCL for this contaminant is under further

review, however, this contaminant shall be monitored in

accordance with R309-205-6(1).

(b) Volatile organic contaminants - The maximum contaminant levels for organic contaminants listed in Table 200-3 apply to community and non-transient non-community water systems.

TABLE 200-3

VOLATILE ORGANIC CONTAMINANTS

Contaminant Maximum Contaminant Level

1. Vinyl chloride 0.002 mg/L

2. Benzene 0.005 mg/L

3. Carbon tetrachloride 0.005 mg/L

4. 1,2-Dichloroethane 0.005 mg/L

5. Trichloroethylene 0.005 mg/L

6. para-Dichlorobenzene 0.075 mg/L

7. 1,1-Dichloroethylene 0.007 mg/L

8. 1,1,1-Trichloroethane 0.2 mg/L

9. cis-1,2-Dichloroethylene 0.07 mg/L

10. 1,2-Dichloropropane 0.005 mg/L

11. Ethylbenzene 0.7 mg/L

12. Monochlorobenzene 0.1 mg/L

13. o-Dichlorobenzene 0.6 mg/L

14. Styrene 0.1 mg/L

15. Tetrachloroethylene 0.005 mg/L

16. Toluene 1 mg/L

17. trans-1,2-Dichloroethylene 0.1 mg/L

18. Xylenes (total) 10 mg/L

19. Dichloromethane 0.005 mg/L

20. 1,2,4-Trichlorobenzene 0.07 mg/L

21. 1,1,2-Trichloroethane 0.005 mg/L

(i) Community and Non-transient non-community water systems. Surface Water systems serving 10,000 or more persons shall comply with this section beginning January 1, 2002. Surface water systems serving fewer than 10,000 persons and systems using only ground water not under the direct influence of surface water shall comply with this section beginning January 1, 2004.

(A) Compliance with the disinfection byproduct MCLs listed in Table 200-4 shall be determined by the procedures listed in R309-210-8(6) until the date specified by system size listed in R309-210-10(1)(c) at which time compliance shall be determined utilizing LRAA as specified in R309-210-10(1)(d).

(ii) Transient non-community water systems. Surface water systems serving 10,000 or more persons and using chlorine dioxide as a disinfectant or oxidant shall comply with the chlorine dioxide MRDL beginning January 1, 2002. Surface water systems serving fewer than 10,000 persons and using chlorine dioxide as a disinfectant or oxidant and systems using only ground water not under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant shall comply with the chlorine dioxide MRDL beginning January 1, 2004.

(iii) The maximum contaminant levels (MCLs) for disinfection byproducts are listed in Table 200-4.

TABLE 200-4

DISINFECTION BYPRODUCTS

DISINFECTION BYPRODUCT MCL (mg/L)

Total trihalomethanes (TTHM) 0.080

Haloacetic acids (five) (HAA5) 0.060

Bromate 0.010

Chlorite 1.0

(iv) The maximum residual disinfectant levels (MRDLs) are listed in Table 200-5.

TABLE 200-5

MAXIMUM RESIDUAL DISINFECTANT LEVELS

DISINFECTANT RESIDUAL MRDL (mg/L)

Chlorine 4.0 (as Cl2)

Chloramines 4.0 (as Cl2)

Chlorine dioxide 0.8 (as ClO2)

(v) Control of Disinfectant Residuals. Notwithstanding the MRDLs listed in Table 200-5, systems may increase residual disinfectant levels in the distribution system of chlorine or chloramines (but not chlorine dioxide) to a level and for a time necessary to protect public health, to address specific microbiological contamination problems caused by circumstances such as, but not limited to, distribution line breaks, storm run-off events, source water contamination events, or cross-connection events.

(vi) A system that is installing GAC or membrane technology to comply with this section may apply to the Director for an extension of up to 24 months past the dates in paragraph (c)(i) of this section, but not beyond December 31, 2003. In granting the extension, the Director shall set a schedule for compliance and may specify any interim measures that the system shall take. Failure to meet the schedule or interim treatment requirements constitutes a violation of Utah Public Drinking Water Rules.

(4) Radiologic Chemicals.

(a) Compliance dates. Compliance dates for combined radium-226 and -228, gross alpha particle activity, gross beta particle and photon radioactivity, and uranium: Community water systems shall comply with the MCLs listed in paragraphs (b), (c), (d), and (e) of this section beginning December 8, 2003 and compliance shall be determined in accordance with the requirements of this sub-section (4) and R309-205-7. Compliance with reporting requirements for the radionuclides under R309-220 and R309-225 is required on December 8, 2003.

(b) Combined radium-226 and -228. The maximum contaminant level for combined radium-226 and radium-228 is 5 pCi/L. The combined radium-226 and radium-228 value is determined by the addition of the results of the analysis for radium-226 and the analysis for radium-228.

(c) Gross alpha particle activity (excluding radon and uranium). The maximum contaminant level for gross alpha particle activity (including radium-226 but excluding radon and uranium) is 15 pCi/L.

(d) The MCL for beta particle and photon radioactivity.

(i) The average annual concentration of beta particle and photon radioactivity from man-made radionuclides in drinking water shall not produce an annual dose equivalent to the total body or any internal organ greater than 4 millirem/year (mrem/year).

(ii) Except for the radionuclides listed in Table 200-6, the concentration of man-made radionuclides causing 4 mrem total body or organ dose equivalents shall be calculated on the basis of 2 liters per day drinking water intake using the 168 hour data list in "Maximum Permissible Body Burdens and Maximum Permissible Concentrations of Radionuclides in Air and in Water for Occupational Exposure," NBS (National Bureau of Standards) Handbook 69 as amended August 1963, U.S. Department of Commerce. Copies of this document are available from the National Technical Information Service, NTIS ADA 280 282, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, Virginia 22161. The toll-free number is 800-553-6847. Copies may be inspected at the Division of Drinking Water offices. If two or more radionuclides are present, the sum of their annual dose equivalent to the total body or to any organ shall not exceed 4 mrem/year.

TABLE 200-6

MAN-MADE RADIONUCLIDE CONTAMINANTS

Average Annual Concentrations Assumed to Produce:

A Total Body or Organ Dose of 4 mrem/yr

Radionuclide Critical organ pCi per liter

Tritium Total body 20,000

Strontium-90 Bone Marrow 8

(e) The MCL for uranium. The maximum contaminant level for uranium is 30 ug/L.

(5) TURBIDITY

(a) All public water systems using surface water or ground water under the direct influence of surface water shall provide treatment consisting of both disinfection, as specified in R309-200-5(7)(a), and filtration treatment which complies with the requirements of paragraph (i), (ii) or (iii) of this section.

(i) Conventional filtration treatment or direct filtration.

(A) For systems using conventional filtration or direct filtration, the turbidity level of representative samples of a system's combined filtered effluent water shall be less than or equal to 0.3 NTU in at least 95 percent of the measurements taken each month, measured as specified in R309-200-4(3) and R309-215-9.

(B) The turbidity level of representative samples of a system's combined filtered effluent water shall at no time exceed 1.0 NTU, measured as specified in R309-200-4(3) and R309-215-9.

(C) A system that uses lime softening may acidify representative samples prior to analysis using a protocol approved by the Director.

(ii) Filtration technologies other than conventional filtration treatment, direct filtration, slow sand filtration, or diatomaceous earth

filtration. A public water system may use a filtration technology not listed in paragraph (i) or (iii) of this subsection if it demonstrates to the Director, using pilot plant studies or other means, that the alternative filtration technology, in combination with disinfection treatment that meets the requirements of R309-200-5(7), consistently achieves 99.9 percent removal and/or inactivation of Giardia lamblia cysts and 99.99 percent removal and/or inactivation of viruses, and 99 percent removal of Cryptosporidium oocysts, and the Director approves the use of the filtration technology. For each approval, the Director will set turbidity performance requirements that the system shall meet at least 95 percent of the time and that the system may not exceed at any time at a level that consistently achieves 99.9 percent removal and/or inactivation of Giardia lamblia cysts, 99.99 percent removal and/or inactivation of viruses, and 99 percent removal of Cryptosporidium oocysts. For alternative filtration technology using membrane filtration, the turbidity performance requirements shall be a turbidity level of less than or equal to 0.1 NTU in at least 95 percent of the measurements taken each month and that at no time exceeds 0.5 NTU, measured as specified in Subsection R309-200-4(3) and Section R309-215-9. For alternative filtration technology other than membrane filtration, the turbidity level of representative samples shall at no time exceed 5.0 NTU for any treatment technique, measured as specified in R309-215-9(1)(c) and (d).

(iii) The turbidity limit for slow sand filtration and diatomaceous earth filtration shall be less than or equal to 1.0 NTU in at least 95 percent of the measurements taken each month, measured as specified in R309-215-9(1)(c) and (d). For slow sand filtration only, if the Director determines that the system is capable of achieving 99.9 percent removal and inactivation of Giardia lamblia cysts at some turbidity level higher than 1.0 NTU in at least 95 percent of the measurements, the Director may substitute this higher turbidity limit for that system. The turbidity level of representative samples shall at no time exceed 5.0 NTU for any treatment technique, measured as specified in R309-215-9(1)(c) and (d).

(i) The following turbidity limit applies to community water systems only.

(ii) The limit for turbidity in drinking water from ground water sources not under the direct influence of surface sources is 5.0 NTU based on an average for two consecutive days pursuant to R309-205-8(3).

(6) MICROBIOLOGICAL QUALITY

(a) The maximum contaminant level (MCL) for microbiological contaminants for all public water systems is:

(i) For a system that collects at least 40 samples per month, if no more than 5.0 percent of the samples collected during a month are total coliform-positive, the system is in compliance with the MCL for total coliforms.

(ii) For a system that collects fewer than 40 samples per month, if no more than one sample collected during a month is total coliform-positive, the system is in compliance with the MCL for total coliforms.

(b) A system is in compliance with the MCL for E. coli for samples taken under the provisions of R309-211 unless any of the conditions identified in paragraphs (b)(i) through (b)(iv) of this section occur. For purposes of the public notification requirements in R309-220, violation of the MCL may pose an acute risk to health.

(i) The system has an E. coli-positive repeat sample following a total coliform-positive routine sample.

(ii) The system has a total coliform-positive repeat sample following an E. coli-positive routine sample.

(iii) The system fails to take all required repeat samples following an E. coli-positive routine sample.

(iv) The system fails to test for E. coli when any repeat sample tests positive for total coliform.

(c) A public water system must determine compliance with the MCL for E. coli in paragraph (b) of this section for each month in which it is required to monitor for total coliforms.

(7) DISINFECTION

Continuous disinfection is recommended for all water sources. It shall be required of all ground water sources which do not consistently meet standards of bacteriologic quality. Surface water sources or ground water sources under direct influence of surface water shall be disinfected and continuously monitored for disinfection residual during the course of required conventional complete treatment for systems serving greater than 3,300 people. Disinfection shall not be considered a substitute for inadequate collection or filtration facilities.

Successful disinfection assures 99.9 percent inactivation of Giardia lamblia cysts and 99.99 percent inactivation of enteric viruses. Both filtration and disinfection are considered treatment techniques to protect against the potential adverse health effects of exposure to Giardia lamblia, viruses, Legionella, and heterotrophic bacteria in water. Minimum disinfection levels are set by "CT" values as defined in R309-110.

(a) Each public water system that provides filtration treatment shall provide disinfection treatment as follows:

(i) The disinfection treatment shall be sufficient to ensure that the total treatment processes of the system achieve at least 99.9 percent (3-log) inactivation and/or removal of Giardia lamblia cysts and at least 99.99 percent (4-log) inactivation and/or removal of viruses, as determined by the Director.

(ii) The residual disinfectant concentration in the water entering the distribution system cannot be less than 0.2 mg/L for more than 4 hours.

(iii) The residual disinfectant concentration in the distribution system, measured as combined chlorine or chlorine dioxide, cannot be undetectable in more than 5 percent of the samples each month, for any two consecutive months that the system serves water to the public. Water in the distribution system with a heterotrophic bacteria concentration less than or equal to 500/ml, measured as heterotrophic plate count (HPC) is deemed to have a detectable disinfectant residual for purposes of determining compliance with this requirement. Thus, the value "V" in the following formula cannot exceed 5 percent in one month, for any two consecutive months.

V = ((c + d + e) / (a + b)) x 100 where:

a = number of instances where the residual disinfectant concentration is measured;

b = number of instances where the residual disinfectant concentration is not measured but heterotrophic bacteria plate count (HPC) is measured;

c = number of instances where the residual disinfectant concentration is measured but not detected and no HPC is measured;

d = number of instances where no residual disinfectant concentration is detected and where HPC is greater than 500/ml;

e = number of instances where the residual disinfectant concentration is not measured and HPC is greater than 500/ml.

(b) If the Director determines, based on site-specific considerations, that a system has no means for having a sample transported and analyzed for HPC by a certified laboratory under the requisite time and temperature conditions specified in R309-200-4(3) and that the system is providing adequate disinfection in the distribution system, the requirements of R309-200-5(7)(a)(iii) do not apply.

(c) If a system utilizes a combination of sources, some surface water influenced (requiring filtration and disinfection treatment) and others deemed ground water (not requiring any treatment, even disinfection), the Director may, based on site-specific considerations, allow sampling for residual disinfectant or HPC at locations other than those specified by total coliform monitoring required by R309-211.

KEY: drinking water, quality standards, regulated contaminants

Date of Last Change: 2026[March 31, 2022]

Notice of Continuation: February 10, 2025

Authorizing, and Implemented or Interpreted Law: 19-4-104

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