California Code of Regulations
Title 22 - Social Security
Division 4 - Environmental Health
Chapter 15 - Domestic Water Quality and Monitoring Regulations
Article 3 - Primary Standards-Bacteriological Quality
Section 64426.1 - E. Coli Maximum Contaminant Level (MCL)

Universal Citation: 22 CA Code of Regs 64426.1

Current through Register 2024 Notice Reg. No. 38, September 20, 2024

(a) A public water system shall determine compliance with the E. coli MCL for each month in which it is required to monitor for total coliforms. Results of all samples collected in a calendar month pursuant to Sections 64423, 64424, and 64425 that are not invalidated by the State Board or the laboratory shall be included in determining compliance with the E. coli MCL. Special purpose samples such as those listed in Section 64421(b) and special purpose samples collected by a public water system during special investigations shall not be used to determine compliance with the E. coli MCL.

(b) A public water system is in violation of the E. coli MCL when any of the following occurs:

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

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

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

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

(c) If a public water system is not in compliance with subsections (b)(1) through (4), during any month in which it supplies water to the public, the system shall notify the State Board by the end of the day on which this is determined. The system shall also notify the public pursuant to Sections 64463, 64463.1, and 64465.

(d) A public water system in violation of the reporting requirement in subsection (c) to notify the State Board shall notify the public pursuant to Sections 64463, 64463.7, and 64465.

(e) A public water system shall not be eligible for a variance or exemption from the E. coli MCL.

1. New section filed 7-1-92; operative 7-31-92 (Register 92, No. 28).
2. Amendment of subsection (c) and new subsection (d) filed 9-8-94 as an emergency; operative 9-8-94 (Register 94, No. 36). A Certificate of Compliance must be transmitted to OAL by 1-6-95 or emergency language will be repealed by operation of law on the following day.
3. Amendment of subsection (c) and new subsection (d) refiled 1-3-95 as an emergency; operative 1-3-95 (Register 95, No. 1). A Certificate of Compliance must be transmitted to OAL by 5-3-95 or emergency language will be repealed by operation of law on the following day.
4. Amendment of subsection (c) and new subsection (d) refiled 4-26-95 as an emergency; operative 4-26-95 (Register 95, No. 17). A Certificate of Compliance must be transmitted to OAL by 8-24-95 or emergency language will be repealed by operation of law on the following day.
5. Certificate of Compliance as to 4-26-95 order including repealer of subsection (d) transmitted to OAL 5-5-95 and filed 6-19-95 (Register 95, No. 25).
6. Amendment of subsection (c) and amendment of NOTE filed 8-2-2006; operative 9-1-2006 (Register 2006, No. 31).
7. Change without regulatory effect amending subsections (a) and (c) and NOTE filed 6-2-2015 pursuant to section 100, title 1, California Code of Regulations (Register 2015, No. 23).
8. Amendment of section heading, section and NOTE filed 5-28-2021; operative 7-1-2021 (Register 2021, No. 22).

Note: Authority cited: Sections 116271 and 116375, Health and Safety Code. Reference: Sections 116375 and 116450, Health and Safety Code.

Disclaimer: These regulations may not be the most recent version. California may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.