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 64423.1 - Sample Analysis and Reporting of Results

Universal Citation: 22 CA Code of Regs 64423.1

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

(a) A public water system shall designate (label) each sample as routine, repeat, replacement, or "other" pursuant to Section 64421(b), and have each sample analyzed for total coliforms. The system also shall require the laboratory to analyze the same sample for Escherichia coli (E. coli) whenever the presence of total coliforms is indicated. As a minimum, the analytical results shall be reported in terms of the presence or absence of total coliforms and E. coli, in the sample, whichever is appropriate. If directed by the State Board, based on an identified sanitary defect, exceedance of a Level 1 or Level 2 coliform treatment technique trigger, history of total coliform-positive samples within the past 12 consecutive months, or determination of a possible significant rise in bacterial count in accordance with Section 64426, the analytical results shall be reported in terms of coliform density of total coliforms and E. coli, in the sample, whichever is appropriate.

(b) A public water system shall require the laboratory to notify the system within 24 hours, whenever the presence of total coliform or E. coli is demonstrated in a sample or a sample is invalidated due to interference problems, pursuant to Section 64425(b), ensure that a contact person is available to receive these analytical results 24-hours a day, and provide the name(s) and contact information of the contact person(s) to the laboratory. The system shall also require the laboratory to immediately notify the State Board of any positive bacteriological results if the laboratory cannot make direct contact with the designated contact person within 24 hours.

(c) Analytical results of all required samples collected for a public water system in a calendar month shall be reported to the State Board not later than the tenth day of the following month, as follows:

(1) Systems serving more than 400 service connections or 1000 persons, or a wholesaler as defined in section 64402.20(a), shall submit a monthly summary of the bacteriological monitoring results to the State Board, which shall contain the following:
(A) Total number of samples collected;

(B) Number, sample collection date, and sample location of all total coliform and E. coli-positive samples;

(C) Number, sample collection date, sample location, and result of triggered groundwater source samples collected; and

(D) Sample collection date, sample location, and result for all repeat samples collected.

(2) Systems serving fewer than 10,000 service connections shall require the laboratory to submit copies of all required bacteriological monitoring results directly to the State Board; and

(3) Systems serving 10,000 or more service connections shall require the laboratory to submit copies of bacteriological monitoring results for all positive routine samples and all repeat samples directly to the State Board.

(d) A public water system in violation of the monitoring requirement of subsection (a) to test the same sample for E. coli following a total coliform-positive routine sample shall notify the State Board within 10 days after it learns of the violation and shall notify the public pursuant to Sections 64463, 64463.7, and 64465.

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

1. New section filed 7-1-92; operative 7-31-92 (Register 92, No. 28).
2. Amendment of subsection (b) and NOTE filed 5-15-2001; operative 6-14-2001 (Register 2001, No. 20).
3. Change without regulatory effect amending subsections (b)-(d) and NOTE filed 6-2-2015 pursuant to section 100, title 1, California Code of Regulations (Register 2015, No. 23).
4. Amendment of 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, 116385 and 116450, Health and Safety Code.

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