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(continued)
(1) Been free from fecal coliform or E. coli occurrence based on at least daily sampling;

(2) Contained less than one total coliform per hundred milliliters of water in at least ninety-five per cent of all samples based on at least daily sampling;
(3) Complied with the turbidity requirements of section 64653, if approved surface water; and
(4) Maintained a continuous disinfection residual of at least 0.2 mg/L at the entry point(s) to the distribution system;
(b) The system has had no waterborne microbial disease outbreak, pursuant to section 64651.91, while operated in its present configuration;
(c) The system maintains contact at least twice a week with the Department and local health departments to assess illness possibly attributable to microbial occurrence in the public drinking water system;
(d) The system has analyzed, on a monthly basis, at least the number of samples required pursuant to the approved sample siting plan and has not had an E. coli-positive compliance sample within the last six months, unless the system demonstrates to the Department that the occurrence is not due to contamination entering the distribution system;
(e) The system has undergone a sanitary survey conducted by the Department within the past twelve months;
(f) The system maintains a cross-connection control program in accordance with sections 7583 through 7605, title 17 of the California Code of Regulations;
(g) The system agrees to submit a biofilm control plan to the Department within twelve months of the granting of the first request for a variance;
(h) The system monitors general distribution system bacterial quality by conducting heterotrophic bacteria plate counts on at least a weekly basis at a minimum of ten percent of the number of total coliform sites specified in the approved sample siting plan (preferably using the methods in section 9215(a), 18th edition of Standard Methods for the Examination of Water and Wastewater, 1992, American Public Health Association, et. al); and
(i) The system conducts daily monitoring at distribution systemtotal coliform monitoring sites approved by the Department and maintains a detectable disinfectant residual at a minimum of ninety-five percent of those points and a heterotrophic plate count of less than 500 colonies per ml at sites without a disinfectant residual.
(j) No water system shall be eligible for a variance or exemption from the MCL for total coliforms unless it demonstrates that the violation of the total coliform MCL is due to a persistent growth of total coliforms in the distribution system pursuant to section 64426.5, rather than to fecal or pathogenic contamination, a treatment lapse or deficiency, or a problem in the operation or maintenance of the distribution system.


Note: Authority cited: Sections 100275 and 116375, Health and Safety Code. Reference: Section 116430(a), Health and Safety Code.








s 64427. Sanitary Survey.
Systems which collect less than five routine samples per month shall be subject to an initial sanitary survey by the Department by June 29, 1994 for community water systems and June 29, 1999 for nontransient-noncommunity and transient-noncommunity water systems. Sanitary surveys shall be repeated every five years.


Note: Authority cited: Sections 208 and 4023.3, Health and Safety Code. Reference: Section 4023.3, Health and Safety Code.








s 64430. Best Available Technology (BAT).


Note: Authority cited: Section 4023.2, Health and Safety Code. Reference: Section 4021, Health and Safety Code.








s 64431. Maximum Contaminant Levels -Inorganic Chemicals.
(a) The primary MCLs for the drinking water chemicals shown in Table 64431-A shall not be exceeded in the water supplied to the public.
Table 64431-A Maximum Contaminant Levels Inorganic Chemicals


Maximum Contaminant
Chemical Level, mg/L
Aluminum 1.

Antimony 0.006
Arsenic 0.05
Asbestos 7 MFL [FNa1]
Barium 1.
Beryllium 0.004
Cadmium 0.005
Chromium 0.05
Cyanide 0.15
Fluoride 2.0
Mercury 0.002
Nickel 0.1
Nitrate (as NO3 45.
Nitrate+Nitrite (sum as nitrogen) 10.
Nitrite (as nitrogen) 1.
Selenium 0.05
Thallium 0.002

[FNa1] MFL=million fibers per liter; MCL for fibers exceeding 10 um in length.


Note: Authority cited: Sections 100275, 116350, 116365 and 116375, Health and Safety Code. Reference: Sections 116365 and 116470, Health and Safety Code.








s 64432. Monitoring and Compliance -Inorganic Chemicals.
(a) All public water systems shall monitor to determine compliance with the nitrate and nitrite MCLs in Table 64431-A, pursuant to subsections 64432(c) through (e) of this section and Section 64432.1. All community and nontransient-noncommunity water systems shall also monitor to determine compliance with the MCLs in Table 64431-A, pursuant to subsections 64432(b) through (l) of this section, and Section 64432.2. Monitoring shall be conducted in the year designated by the Department of each compliance period beginning with the compliance period starting January 1, 1993.
(b) The frequency of monitoring conducted to determine compliance with the MCLs for the inorganic chemicals listed in Table 64431-A, except for asbestos and nitrate/nitrite, shall be as follows:
(1) Each compliance period, all community and nontransient-noncommunity systems using groundwater shall monitor once during the year designated by the Department. The Department will designate the year based on historical monitoring frequency and laboratory capacity. All community and nontransient-noncommunity systems using approved surface water shall monitor annually. All systems monitoring at distribution entry points which have combined surface and groundwater sources shall monitor annually.
(2) Quarterly samples shall be collected and analyzed for any chemical if analyses of such samples indicate a continuous or persistent trend toward higher levels of that chemical, based on an evaluation of previous data.
(c) For the purposes of Sections 64432, 64432.1 and 64432.2, detection shall be defined by the detection limits for purposes of reporting (DLRs) in Table 64432-A.
Table 64432-A Detection Limits for Purposes of Reporting (DLRs) for Regulated
Inorganic Chemicals


Detection Limit for
Chemical Purposes of Reporting
(DLR) (mg/L)
Aluminum 0.05
Antimony 0.006
Arsenic 0.002
Asbestos 0.2
MFL>10um [FNa1]
Barium 0.1
Beryllium 0.001
Cadmium 0.001
Chromium 0.01
Cyanide 0.1
Fluoride 0.1
Mercury 0.001
Nickel 0.01
Nitrate (as NO 3) 2.
Nitrite (as nitrogen) 0.4

Selenium 0.005
Thallium 0.001

[FNa1] MFL=million fibers per liter; DLR for fibers exceeding 10 um in length.
(d) Samples shall be collected from each water source or a supplier may collect a minimum of one sample at every entry point to the distribution system which is representative of each source after treatment. The system shall collect each sample at the same sampling site, unless a change is approved by the Department.
(e) A water system may request approval from the Department to composite samples from up to five sampling sites, provided that the number of sites to be composited is less than the ratio of the MCL to the DLR. Approval will be based on a review of three years of historical data, well construction and aquifer information for groundwater, and intake location, similarity of sources, and watershed characteristics for surface water. Compositing shall be done in the laboratory.

(1) Systems serving more than 3,300 persons shall composite only from sampling sites within a single system. Systems serving 3,300 persons or less may composite among different systems up to the 5-sample limit.
(2) If any inorganic chemical is detected in the composite sample at a level equal to or greater than one fifth of the MCL, a follow-up sample shall be analyzed within 14 days from each sampling site included in the composite for the contaminants which exceeded the one-fifth-MCL level. If available, duplicates of the original sample taken from each sampling site used in the composite may be used instead of resampling; the analytical results shall be reported within 14 days. The water supplier may collect up to two additional samples each from one or more of the sources to confirm the result(s).
(3) Compliance for each site shall be determined on the basis of the individual follow-up samples, or on the average of the follow-up and confirmation sample(s) if the supplier collects confirmation sample(s) for each detection.
(f) If the level of any inorganic chemical, except for nitrate, nitrite, or nitrate plus nitrite, exceeds the MCL, the water supplier shall do one of the following:

(1) Inform the Department within 48 hours and monitor quarterly beginning in the next quarter after the violation occurred; or
(2) Inform the Department within seven days from the receipt of the analysis and collect one additional sample within 14 days to confirm the result. If the average of the two samples collected exceeds the MCL, this information shall be reported to the Department within 48 hours and the water supplier shall monitor quarterly beginning in the next quarter after the violation occurred.
(g) For systems monitoring quarterly, compliance shall be determined by a running annual average; if any one sample would cause the annual average to exceed the MCL, the system is out of compliance immediately. For systems monitoring annually or less frequently, compliance shall be determined based on the initial sample or the average of the initial and confirmation samples, if a confirmation sample is collected.
(h) If a system using groundwater has collected a minimum of two quarterly samples or a system using approved surface water has collected a minimum of four quarterly samples and the sample results have been below the MCL, the system may apply to the Department for a reduction in monitoring frequency.
(i) Water quality data collected prior to January 1, 1990, and/or data collected in a manner inconsistent with this section shall not be used in the determination of compliance with the monitoring requirements for inorganic chemicals.
(j) Water quality data collected in compliance with the monitoring requirements of this section by a wholesaler agency providing water to a public water system shall be acceptable for use by that system for compliance with the monitoring requirements of this section.
(k) A water system may apply to the Department for a waiver from the monitoring frequencies specified in paragraph (b)(1) of this section, if the system has conducted at least three rounds of monitoring (three periods for groundwater sources or three years for approved surface water sources) and all previous analytical results are less than the MCL. The water system shall specify the basis for its request. If granted a waiver, a system shall collect a minimum of one sample per source while the waiver is in effect and the term of the waiver shall not exceed one compliance cycle (i.e., nine years).
(l) A water system may be eligible for a waiver from the monitoring frequencies for cyanide specified in paragraph (b)(1) of this section without any prior monitoring if it is able to document that it is not vulnerable to cyanide contamination pursuant to the requirements in section 64445(d)(1) or (d)(2).
(m) Transient-noncommunity water systems shall monitor for inorganic chemicals as follows:
(1) All sources shall be monitored at least once for fluoride;
(2) Surface water sources for parks and other facilities with an average daily population use of more than 1000 people and/or which are determined to be subject to potential contamination based on a sanitary survey shall be monitored at the same frequency as community water systems.


Note: Authority cited: Sections 100275 and 116375, Health and Safety Code. Reference: Section 116385, Health and Safety Code.








s 64432.1. Monitoring and Compliance -Nitrate and Nitrite.
(a) To determine compliance with the MCL for nitrate in Table 64431-A, all public water systems using groundwater and transient-noncommunity systems using approved surface water shall monitor annually, and all community and nontransient-noncommunity systems using approved surface water shall monitor quarterly.
(1) The water supplier shall require the laboratory to notify the supplier within 24 hours whenever the level of nitrate in a single sample exceeds the MCL, and shall ensure that a contact person is available to receive such analytical results 24-hours a day. The water supplier shall also require the laboratory to immediately notify the Department of any acute nitrate MCL exceedance if the laboratory cannot make direct contact with the designated contact person within 24 hours. Within 24 hours of notification, the water supplier shall:
(A) Collect another sample, and
(B) Analyze the new sample; if the average of the two nitrate sample results exceeds the MCL, report the result to the Department within 24 hours. If the average does not exceed the MCL, inform the Department of the results within seven days from the receipt of the original analysis.
(C) If a system is unable to resample within 24 hours, it shall notify the consumers by issuing a Tier 1 Public Notice pursuant to section 64463.1 and shall collect and analyze a confirmation sample within two weeks of notification of the results of the first sample.
(2) For public water systems using groundwater, the repeat monitoring frequency shall be quarterly for at least one year following any one sample in which the concentration is greater than or equal to 50 percent of the MCL. After four consecutive quarterly samples are less than the MCL, a system may request that the Department reduce monitoring frequency to annual sampling.
(3) For public water systems using approved surface water, the repeat monitoring frequency shall be quarterly following any one sample in which the concentration is greater than or equal to 50 percent of the MCL. After four consecutive quarterly samples are less than 50 percent of the MCL, a system may request that the Department reduce monitoring frequency to annual sampling. A system using approved surface water shall return to quarterly monitoring if any one sample is greater than or equal to 50 percent of the MCL.
(4) After any round of quarterly sampling is completed, each community and nontransient-noncommunity system which initiates annual monitoring shall take subsequent samples during the quarter which previously resulted in the highest analytical results.
(b) All public water systems shall monitor to determine compliance with the MCL for nitrite in Table 64431-A, by taking one sample at each sampling site during the compliance period beginning January 1, 1993.
(1) If the level of nitrite in a single sample is greater than the MCL, the water supplier shall proceed as for nitrate in accordance with paragraph (a)(1) of this section.
(2) The repeat monitoring frequency for systems with an analytical result for nitrite that is greater than or equal to 50 percent of the MCL shall be quarterly monitoring for at least one year. After four consecutive quarterly samples are less than the MCL, a system may request that the Department reduce monitoring frequency to annual sampling, collecting subsequent samples during the quarter which previously resulted in the highest analytical results.
(3) The repeat monitoring frequency for systems with an analytical result for nitrite that is less than 50 percent of the MCL shall be one sample during each compliance period (every three years).
(c) All public water systems shall determine compliance with the MCL for nitrate plus nitrite in Table 64431-A. If the level exceeds the MCL, the water supplier shall proceed as for nitrate in accordance with paragraphs (a)(1) through (a)(4) of this section.


Note: Authority cited: Sections 100275 and 116375, Health and Safety Code. Reference: Section 116385, Health and Safety Code.








s 64432.2. Monitoring and Compliance - Asbestos.
(a) All community and nontransient-noncommunity water systems are required to monitor to determine compliance with the MCL for asbestos in Table 64431-A during the year designated by the Department of the first compliance period of each nine-year compliance cycle, beginning in the compliance period starting January 1, 1993. The Department will designate the year based on historical monitoring frequency and laboratory capacity.
(1) If a groundwater system is vulnerable to asbestos contamination solely in its source water, it shall collect one sample at every entry point to the distribution system which is representative of each water source after treatment and proceed in accordance with Subsections 64432(b)(2) through (d) and Subsections 64432(f) through (j).
(2) All approved surface water systems shall be designated vulnerable to asbestos contamination in their source waters. If a surface water system is vulnerable solely in its source water, it shall proceed as in paragraph (1) above.
(3) If a system is vulnerable to asbestos contamination due to leaching of asbestos-cement pipe, with or without vulnerability to asbestos contamination in its source water, it shall take one sample at a tap served by asbestos-cement pipe under conditions where asbestos contamination is most likely to occur.
(b) If the level of asbestos exceeds the MCL in Table 64431-A, the supplier shall report to the Department within 48 hours and monitor quarterly beginning in the next quarter after the violation occurred. A system may request that the Department reduce monitoring frequency to one sample every compliance cycle, pursuant to Section 64432(h).
(c) If a system is not vulnerable either to asbestos contamination in its source water or due to leaching of asbestos-cement pipe, it may apply to the Department for a waiver of the monitoring requirements in paragraphs (a)(1) through (3) of this section. The Department will determine the vulnerability of groundwater sources on the basis of historical monitoring data and possible influence of serpentine formations. Vulnerability due to leaching of asbestos-cement pipe will be determined by the Department on the basis of the presence of such pipe in the distribution system and evaluation of the corrosivity of the water. The period of the waiver shall be three years.


Note: Authority cited: Sections 208 and 4023.3, Health and Safety Code. Reference: Section 4024, Health and Safety Code.








s 64433. System Requirements and Exemptions.
(a) Any public water system with 10,000 service connections or more that does not have a fluoridation system shall install such a system pursuant to the requirements in this article if the Department identifies a source of sufficient funds not excluded by Health and Safety Code section 116415 to cover capital and any associated costs necessary to install such a system. Installation shall be completed within two years of the date the funds are received by the water system; the water system may apply to the Department for an extension of the deadline. Following installation, if the Department identifies a source of sufficient funds not excluded by Health and Safety Code section 116415 to cover the noncapital operations and maintenance costs for the period of a year or more, the system shall fluoridate within three months of receiving the funds and shall continue fluoridating so long as such funds are received.
(b) Any public water system with 10,000 service connections or more that has a fluoridation system but ceased fluoridating prior to December 31, 1995 shall fluoridate the drinking water if its fluoridation system is determined to be capable of fluoridating the drinking water in compliance with Section 64433.2, based on a Departmental review, and the Department identifies a source of sufficient funds not excluded by Health and Safety Code section 116415 to cover the noncapital operations and maintenance costs for the period of a year or more. Such a system shall fluoridate within one month of receiving the funds and shall continue fluoridating so long as such funds are received.
(c) Any public water system required to install a fluoridation system pursuant to subsection (a) or required to fluoridate pursuant to subsection (b) shall annually submit an estimate of anticipated fluoridation operations and maintenance costs for the next fiscal year (July 1 through June 30) to the Department by the January 1 preceding that fiscal year.
(d) Any public water system with 10,000 service connections or more that has naturally-occurring fluoride and cannot demonstrate that it maintains an average annual fluoride level that is equal to or greater than the low level specified in the temperature-appropriate "control range" in Table 64433.2-A shall be subject to subsections (a) and (b).
(e) Any public water system which achieves 10,000 service connections or more subsequent to July 1, 1996, that does not have a fluoridation system, or that has naturally-occurring fluoride and meets the criteria in subsection (d) shall provide an estimate to the Department of capital and any associated costs necessary to install a fluoridation system within one year of achieving at least 10,000 service connections:
(f) Any public water system with 10,000 service connections or more shall be exempted from fluoridation in either of the following cases:
(1) The water system does not receive sufficient funds from a source identified by the Department and not excluded by Health and Safety Code section 116415 to cover the capital and associated costs needed to install a fluoridation system; or

(2) The water system received sufficient capital funds from a source identified by the Department and not excluded by Health and Safety Code section 116415 and subsequently installed a fluoridation system or the water system meets the criteria in subsection (b), and the water system did not receive sufficient funds from a source identified by the Department and not excluded by Health and Safety Code section 116415 to cover the noncapital operation and maintenance costs to fluoridate. The water system shall be exempted for any fiscal year (July 1 through June 30) for which it does not receive the funds for noncapital operation and maintenance costs.


Note: Authority cited: Sections 100275, 116410 and 116415, Health and Safety Code. Reference: Sections 116410 and 116415, Health and Safety Code.








s 64433.2. Optimal Fluoride Levels.
Any public water system that is fluoridating shall comply with the temperature-appropriate fluoride levels in Table 64433.2-A. The system shall determine, and submit to the Department, its annual average of maximum daily air temperatures based on the five calendar years immediately preceding the current calendar year.
Table 64433.2-A Optimal Fluoride Levels




Annual average of maximum Optimal Control Range, mg/L
daily air temperatures, degrees fluoride Low High
Fahrenheit Celsius level, mg/L
50.0 to 53.7 10.0 to 12.0 1.2 1.1 1.7
53.8 to 58.3 12.1 to 14.6 1.1 1.0 1.6
58.4 to 63.8 14.7 to 17.7 1.0 0.9 1.5
63.9 to 70.6 17.8 to 21.4 0.9 0.8 1.4
70.7 to 79.2 21.5 to 26.2 0.8 0.7 1.3
79.3 to 90.5 26.3 to 32.5 0.7 0.6 1.2




Note: Authority cited: Sections 100275, 116410 and 116415, Health and Safety Code. Reference: Sections 116410 and 116415, Health and Safety Code.








s 64433.3. Monitoring and Compliance -Fluoride Levels.
(a) If a water system has a single fluoridation system which treats all the water distributed to consumers, the supplier shall collect a daily sample for fluoride analysis, pursuant to Section 64415(b), either in the distribution system or at the entry point. If a water system does not fluoridate all its water and/or has more than one fluoridation system, the supplier shall collect one sample daily in the distribution system and rotate the sample sites in order to be representative of the water throughout the distribution system according to a monitoring plan the Department has determined to be representative. For water systems fluoridating as of January 1, 1997, the plan shall be submitted by July 1, 1998. For all others, the plan shall be submitted prior to initiating fluoridation treatment. A water system shall monitor only when it is operating its fluoridation system.
(b) If more than 20 percent of the daily fluoride samples collected in a month by a water system pursuant to subsection (a) fall outside the control range of optimal levels as determined by temperature for that system pursuant to Section 64433.2, the system shall be out of compliance with Section 64433.2.
(c) At least once a month, any water supplier with an operating fluoridation system shall divide one sample and have one portion analyzed for fluoride by water system personnel and the other portion analyzed pursuant to Section 64415(a).
(d) Any water system with an operating fluoridation system shall sample the raw source waters annually and analyze for fluoride pursuant to Section 64415(a); samples collected pursuant to Section 64432(b)(1) may be used toward satisfying this requirement. All raw source water samples collected under this subsection are subject to compliance with the fluoride MCL in Table 64431-A.
(e) If any sample result obtained pursuant to subsection (a) does not fall within the temperature-appropriate fluoride level control range in Table 64433.2-A, the water supplier shall take action as detailed in the water system's approved fluoridation system operations contingency plan as specified in section 64433.8.


Note: Authority cited: Sections 100275, 116385, 116410 and 116415, Health and Safety Code. Reference: Sections 116365, 116410 and 116415, Health and Safety Code.








s 64433.5. Fluoridation System.
Each fluoridation system installed or modified after January 1, 1997, shall meet the following criteria, as a minimum:
(a) Operate only when a flow of water is detected. If the water system serves less than 200 service connections, a secondary flow-based control device shall be provided as back-up protection;
(b) Provide flow measuring and recording equipment for the fluoride addition;
(c) Provide design and reliability features to maintain the level of fluoride within the temperature-appropriate control range 95 per cent of the time;
(d) Provide for containment of spills; and
(e) Provide alarm features for fluoride chemical feed and fluoride spills.


Note: Authority cited: Sections 100275, 116410 and 116415, Health and Safety Code. Reference: Sections 116410 and 116415, Health and Safety Code.








s 64433.7. Recordkeeping, Reporting, and Notification for Water Systems Fluoridating.
(a) By the tenth day of each month following the month being reported, each water supplier fluoridating its water supply shall send operational reports to the Department which include the following:
(1) The fluoride compounds used and the calculated fluoride dose in mg/L;
(2) Information on any interruptions in the fluoridation treatment which may have occurred during the month including the duration of the interruptions, an explanation of causes, and what corrective actions were taken to insure that fluoridation treatment was resumed in a timely manner;
(3) The results of the daily monitoring for fluoride in the water distribution system, reported in terms of daily results, and ranges and the number of samples collected; and
(4) The results of monthly split sample(s) analyzed pursuant to Section 64433.3(c).
(b) For water systems that fluoridated the previous fiscal year (July 1 through June 30), the water supplier shall report the operations and maintenance costs for that year to the Department by August 1.
(c) Whenever a water system initiates fluoridation, suspends fluoridation for more than ninety days, or reinitiates fluoridation after a suspension of more than ninety days, the water supplier shall notify the consumers, local health departments, pharmacists, dentists, and physicians in the area served by the water system, regarding the status of the fluoridation treatment. If a water system with more than one fluoridation system suspends the use of one or more of its fluoridation systems, but the level of fluoride being served to the consumers is in conformance with Table 64433.2-A, no notification shall be required.
(d) If a fluoride overfeed exceeding 10.0 mg/L occurs, the water system shall notify the Department by the end of the business day of the occurrence or within 24 hours if the Department office is closed.
(e) If the level of fluoride in the distribution system is found to be less than the control range in Table 64433.2-A in two or more samples in a month, the water system shall notify the Department within three business days of the second occurrence. If the level of fluoride in the distribution system is found to be 0.1 mg/L or more above the control range up to 10.0 mg/L, the water supplier shall notify the Department within three business days of the occurrence.


Note: Authority cited: Sections 100275, 116410, 116415 and 116450, Health and Safety Code. Reference: Sections 116410, 116415 and 116450, Health and Safety Code.








s 64433.8. Fluoridation System Operations Contingency Plan.
(a) Water systems fluoridating as of July 1, 1996 shall submit a fluoridation system operations contingency plan by July 1, 1998. All other water systems shall submit the plan at least three months before initiating fluoridation treatment. All fluoridating water systems shall operate in accordance with a fluoridation system operations contingency plan determined by the Department to include the elements in subsection (b).
(b) A fluoridation system operation contingency plan shall include, but not be limited to, the following elements:

(1) Actions to be implemented by the water supplier in the event that the fluoride level in a distribution system sample is found to be less than the control range in Table 64433.2-A, 0.1 mg/L above the control range up to a fluoride level of 2.0 mg/L, from 2.1 to a level of 4.0 mg/L, from 4.1 to a level of 10.0 mg/L, or above a level of 10.0 mg/L.
(2) The procedure for shutting down the fluoridation equipment if there is a fluoride overfeed and the need to do so is identified by the Department and/or the water supplier;
(3) The procedure for investigating the cause of an underfeed or overfeed;
(4) A list of water system, county health department, and Department personnel with day and evening phone numbers to be notified by the end of the business day of the occurrence or within 24 hours if the Department office is closed in the event of an overfeed exceeding 10.0 mg/L; and
(5) The procedure for notifying the public if instructed to do so by the Department in the event of a fluoride underfeed extending for more than three months or a fluoride overfeed exceeding 10.0 mg/L.


Note: Authority cited: Sections 100275, 116410 and 116415, Health and Safety Code. Reference: Sections 116410, 116415 and 116450, Health and Safety Code.








s 64434. Water System Priority Funding Schedule.
Public water systems with 10,000 service connections or more that are not fluoridating as of July 1, 1996, shall install fluoridation systems and initiate fluoridation according to the order established in Table 64434-A, as the water systems receive funds from sources identified by the Department, pursuant to Health and Safety Code section 116415.
Table 64434-A Water System Priority Funding Schedule




SYSTEM No. SYSTEM NAME PRIORITY
3710010 Helix Water District 1
5610017 Ventura, City of 2
4110013 Daly City, City of 3
3710006 Escondido, City of 4
4210011 Santa Maria, City of 5
3410009 Fair Oaks Water District 6
1910083 Manhattan Beach, City of 7
3710025 Sweetwater Authority 8
4210010 Santa Barbara, City of 9
0910001 El Dorado Irrigation District 10
3410006 Citrus Heights Water District 11
4410010 Santa Cruz, City of 12
3610039 San Bernardino, City of 13
3310009 Eastern Municipal Water District 14
3710037 Padre Dam Municipal Water District 15
1910067 Los Angeles, City of 16
2810003 Napa, City of 17
3710020 San Diego, City of 18
3710034 Otay Water District 19
3310031 Riverside, City of 20

1910173 Whittier, City of 21
3410020 Sacramento, City of 22
1910139 California American Water Company - San Marino 23
3710021 San Dieguito Water District 24
3610024 Hesperia Water District 25
1910179 Burbank, City of 26
2710004 California American Water Company - Monterey 27
3310049 Western Municipal Water District 28
3010073 Moulton Niguel Water District 29
3010101 Santa Margarita Water District 30
1910239 Lakewood, City of 31
2110003 North Marin Water District 32
3010037 Yorba Linda Water District 33
3710015 Poway, City of 34
3110025 Placer County Water Agency 35
5010010 Modesto, City of 36
1910126 Pomona, City of 37
3410004 Carmichael Water District 38
1910043 Glendale, City of 39
3610018 Cucamonga Community Water District 40
3910011 Tracy, City of 41

1910234 Walnut Valley Water District 42
3910012 Stockton, City of 43
1910146 Santa Monica, City of 44
3710027 Vista Irrigation District 45
3010018 La Habra, City of 46
1910009 Valley County Water District 47
3310012 Elsinore Valley Municipal Water District 48
1910051 Inglewood, City of 49
3710005 Carlsbad Municipal Water District 50
4210004 Goleta Water District 51
1910213 Torrance, City of 52
1910152 South Gate, City of 53
1910155 Southern California Water Company - Southwest 54
1510017 Indian Wells Valley Water District 55
1910039 San Gabriel Valley Water Company - El Monte 56
1610003 Hanford, City of 57
3310037 Corona, City of 58
3010062 Garden Grove, City of 59
3610003 Apple Valley Ranchos Water Community 60
3610036 Chino Hills, City of 61
3010064 Westminster, City of 62

4310011 San Jose Water Company 63
3610012 Chino, City of 64
3910004 Lodi, City of 65
5610007 Oxnard, City of 66
1910019 Cerritos, City of 67
1910205 Suburban Water Systems - San Jose Hills 68
1910059 Suburban Water Systems - La Mirada 69
1910092 Monterey Park, City of 70
1910174 Suburban Water Systems - Whittier 71
1910026 Compton, City of 72
1910124 Pasadena, City of 73
3310022 Lake Hemet Municipal Water District 74
1910142 Southern California Water Company - San Dimas 75
4510005 Redding, City of 76
3610037 Redlands, City of 77
3910005 Manteca, City of 78
3710014 Oceanside, City of 79
3610038 Rialto, City of 80
4310022 Great Oaks Water Company 81
4310014 Sunnyvale, City of 82
3310021 Jurupa Community Services District 83

3410001 Arcade- Town & County 84
3610052 Victor Valley Water District 85
3010023 Newport Beach, City of 86
3610064 East Valley Water District 87
1910225 Las Virgenes Municipal Water District 88
3710001 California American Water Company - Coronado 89
3610034 Ontario, City of 90
3910001 California Water Service Company - Stockton 91
1910033 Dominguez Water Agency 92
5410015 Tulare, City of 93
5710006 Woodland, City of 94
3710029 Olivenhain Municipal Water District 95
1910003 Arcadia, City of 96
1910008 Azusa Valley Water Company 97
4410011 Watsonville, City of 98
3010003 Buena Park, City of 99
4310005 Milpitas, City of 100
1910017 Santa Clarita Water Company 101
1910240 Valencia Water Company 102
3610004 West San Bernardino Water District 103
0910002 South Tahoe Public Utilities District 104

5610059 Southern California Water Company - Simi Valley 105
3010027 Orange, City of 106
5410010 Porterville, City of 107
4410017 Soquel Creek Water District 108
4110023 San Bruno, City of 109
1910001 Alhambra, City of 110
3010022 Southern California Water Company-West
Orange County 111
3010091 Los Alisos Water District 112
3610050 Upland, City of 113
3410024 Northridge Water District 114
1010003 Clovis, City of 115
3010004 Mesa Consolidated Water District 116
3610041 San Gabriel Valley Water Company - Fontana 117
3410010 Citizens Utilities Company of California -
Suburban 118
3010038 Santa Ana, City of 119
3010092 Irvine Ranch Water District 120
1910211 Park Water Company - Bellflower 121
3010010 Fullerton, City of 122
4310007 Mountain View, City of 123

3010036 San Clemente, City of 124
3010079 El Toro Water District 125
5610020 Thousand Oaks, City of 126
3610029 Monte Vista Water District 127
1910004 Southern California Water Company - Artesia 128
4210016 Southern California Water Company - Orcutt 129
4110008 California Water Service Company - San Mateo 130
1310038 Rancho California Water District 131
3410017 Citizens Utilities Company of California - Parkway 132
1910024 Southern California Water Company - Claremont 133
1910044 Glendora, City of 134
3010001 Anaheim, City of 135
5710001 Davis, City of 136
1910134 California Water Service Company-
Hermosa/Redondo 137
1010007 Fresno, City of 138
1910102 Palmdale Water District 139
4310012 Santa Clara, City of 140
2710010 California Water Service Company - Salinas 141
4910006 Petaluma, City of 142
1910036 California Water Service Company - East Los

Angeles 143
3410013 Citizens Utilities Company of California -
Lincoln Oaks 144
3310001 Coachella Valley Water District 145
5010019 Turlock, City of 146
5410016 California Water Service Company - Visalia 147
5610023 Waterworks District 8-Simi Valley 148
0410002 California Water Service Company - Chico 149
1910104 California Water Service Company - Palos Verdes 150
3410015 Southern California Water Company - Corodva 151
4910009 Santa Rosa, City of 152
1910194 Rowland Water District 153
1510003 California Water Service Company - Bakersfield 154
5610040 California American Water Company - Village
District 155
3310005 Desert Water Agency 156
0110003 California Water Service Company - Livermore 157
3010046 Tustin, City of 158
4310001 California Water Service Company - Los Altos
Suburban 159
4110007 California Water Service Company - San Carlos 160

1910070 Los Angeles, County Water Works District 4&34-
Lancaster 161
1510031 Bakersfield, City of 162
4110009 California Water Service Company - South San
Francisco 163
3010053 Huntington Beach, City of 164
4110006 California Water Service Company - Bear Gulch 165
1910034 Downey, City of 166
4110022 Redwood City 167




Note: Authority cited: Sections 100275, 116410 and 116415, Health and Safety Code. Reference: Sections 116410 and 116415, Health and Safety Code.








s 64435. Maximum Contaminant Levels.


Note: Authority cited: Sections 208 and 4023.3, Health and Safety Code. Reference: Sections 4010-4039.6, Health and Safety Code.








s 64437. Sampling of System Sources.


Note: Authority cited: Sections 208 and 4026, Health and Safety Code. Reference: Section 4024, Health and Safety Code.








s 64439. Requirements.
Community water systems shall comply with the National Interim Primary Drinking Water Regulations for the control of Trihalomethanes in Drinking Water, Sections 141.2(p), (q), (r), (s) and (t), 141.6, 141.12 and 141.30 of Title 40, Code of Federal Regulations, as published in the November 29, 1979, Federal Register (Vol. 44, No. 231) and revised in the March 11, 1980, Federal Register (Vol. 45, No. 49), the December 16, 1998, Federal Register (Vol. 63, No. 241) and the January 16, 2001, Federal Register (Vol. 66, No. 10).


Note: Authority cited: Sections 100275 and 116385, Health and Safety Code. Reference: Sections 100275 and 116385, Health and Safety Code.








s 64441. Natural Radioactivity.


Note: Authority cited: Sections 208 and 4026, Health and Safety Code. Reference: Section 4024, Health and Safety Code.








s 64442. MCLs and Monitoring - Gross Alpha Particle Activity, Radium-226, Radium-228, and Uranium.
(a) Each community and nontransient-noncommunity water system (system) shall comply with the primary MCLs in Table 64442 in the drinking water supplied to the public and use the DLRs for reporting monitoring results:
Table 64442

Radionuclide Maximum Containment Levels (MCLs) and Detection Levels for
Purposes of Reporting (DLRs)


(b) Each system shall monitor to determine compliance with the MCLs in table 64442, as follows:
(1) Monitor at each water source, or every entry point to the distribution system that is representative of all sources being used under normal operating conditions; conduct all monitoring at the same sample site(s) unless a change is approved by the Department, based on a review of the system and its historical water quality data;
(2) For quarterly monitoring, monitor during the same month (first, second or third) of each quarter during each quarter monitored;
(3) By December 31, 2007, complete initial monitoring that consists of four consecutive quarterly samples at each sampling site for each radionuclide in table 64442, except that nontransient-noncommunity water systems shall not be required to monitor radium-228 as a separate analyte, but shall monitor for compliance with the combined radium MCL using the analytical method described in Prescribed Procedures for Measurement of Radioactivity in Drinking Water, Section 6, Alpha-Emitting Radium Isotopes in Drinking Water, method 903.0 (EPA/600/4-80-032, August, 1980):
(A) Data collected for a sampling site between January 1, 2001, and December 31, 2004, may be used to satisfy the initial monitoring requirement, subject to the Department's approval based on whether the analytical methods, DLRs, sampling sites, and the frequency of monitoring used were consistent with this article.
(B) For gross alpha particle activity, uranium, radium-226 and radium-228, the Department may waive the final two quarters of initial monitoring at a sampling site if the results from the previous two quarters are below the DLR(s) and the sources are not known to be vulnerable to contamination.
(c) Any new system or new source for an existing system shall begin monitoring pursuant to Subsection (b) within the first quarter after initiating water service to the public.
(d) After initial monitoring, each system shall monitor for each radionuclide at each sampling site at a frequency determined by the monitoring result(s) [single sample result or average of sample results if more than one sample collected] from the most recent compliance period as follows:
(1) For nontransient-noncommunity water systems, the results for the total radium analyses shall be averaged.
(2) For community water systems, the results of radium-226 and radium-228 analyses shall be added and the average calculated.
(3) The values used for the radionuclide MCLs and DLRs shall be as specified in Table 64442.
(4) If the single sample result or average is:

A. Below the DLR, the system shall collect and analyze at least one sample every nine years (3 compliance periods).
B. At or above the DLR, but at or below 1/2 the MCL, the system shall collect and analyze at least one sample every six years.
C. Above 1/2 the MCL, but not above the MCL, the system shall collect and analyze at least one sample every three years.
(e) A system that monitors quarterly may composite up to four consecutive samples from a single sampling site if analysis is done within a year of the first sample's collection. If the result of the composited sample is greater than 1/2 the MCL, at least one additional quarterly sample shall be analyzed to evaluate the range and trend of results over time before allowing the system to reduce the monitoring frequency.
(f) A gross alpha particle activity measurement may be substituted for other measurements by adding the 95% confidence interval (1.65s, where sis the standard deviation of the net counting rate of the sample) to it; and if,
(1) For uranium and radium measurements (after initial radium-228 monitoring has been completed), the gross alpha measurement does not exceed 5 pCi/L; or
(2) For radium measurements (after initial radium-228 monitoring has been completed), the result obtained from subtracting the uranium measurement from the gross alpha measurement does not exceed 5 pCi/L.
(g) If any sample result is greater than an MCL:
(1) For a system monitoring less than quarterly, quarterly samples shall be collected and analyzed to determine compliance, pursuant to subsection (h);
(2) For a system that already has four consecutive quarterly results, compliance shall be determined pursuant to subsection (h).
(3) The system shall monitor quarterly until the results of four consecutive quarterly sample results do not exceed the MCL.
(h) A system with one or more sample results greater than an MCL shall determine compliance with the MCL as follows:
(1) At each sampling site, based on the analytical results for that site. Any confirmation sample result shall be averaged with the initial result.
(2) Using all monitoring results collected under this section during the previous 12 months, even if more than the minimum required number of samples was collected.
(3) By a running annual average of four consecutive quarters of sampling results. Averages shall be rounded to the same number of significant figures as the MCL for which compliance is being determined.
(A) If any sample result will cause the annual average at any sample site to exceed the MCL, the system shall be out of compliance immediately upon receiving the result;
(B) If a system has not analyzed the required number of samples, compliance shall be determined by the average of the samples collected at the site during the most recent 12 months; and
(C) If a sample result is less than the DLRin table 64442, zero shall be used to calculate the annual average, unless a gross alpha particle activity is being used in lieu of radium-226, total radium, and/or uranium. In that case, if the gross alpha particle activity result is less than the DLR, 1/2 the DLR shall be used to calculate the annual average. (continued)