§ 22-64654. Disinfection.

(a) All approved surface water utilized by a supplier shall be provided with continuous disinfection treatment sufficient to insure that the total treatment process provides inactivation ofGiardia lamblia cysts and viruses, in conjunction with the removals obtained through filtration, to meet the reduction requirements specified in section 64652(a).

(b) Disinfection treatment shall comply with the following performance standards:

(1) Water delivered to the distribution system shall not contain a disinfectant residual of less than 0.2 mg/l for more than four hours in any 24 hour period.

(2) The residual disinfectant concentrations of samples collected from the distribution system shall be detectable in at least 95 percent of the samples taken each month that the system serves water to the public, except as provided in subsection (c). At any sample point in the distribution system, the presence of heterotrophic plate count (HPC) at concentrations less than or equal to 500 colony forming units per milliliter shall be considered equivalent to a detectable disinfectant residual.

(c) Paragraph (b)(2) shall not apply to suppliers serving fewer than 500 persons provided:

(1) The system is in compliance with 17 CCR sections 7583 through 7605, and with 22 CCR sections 64602, 64570(b), 64572, and 64580;

(2) The supplier has no means for having a sample transported and analyzed for HPC by a certified laboratory under the appropriate time and temperature conditions; and

(3) The supplier is providing adequate disinfection in the distribution system.

(d) No exemptions from the requirement in paragraph (b)(1) are permitted.

HISTORY

1. New section filed 5-6-91; operative 6-5-91 (Register 91, No. 25).

2. Change without regulatory effect amending section filed 6-28-91, pursuant to section 100, title 1, California Code of Regulations; operative 6-28-91 (Register 91, No. 40).

3. Amendment of subsections (a) and (b)(2)-(c)(2), new subsection (d) and amendment of Note filed 6-8-98; operative 7-8-98 (Register 98, No. 24).

4. Amendment of subsections (a), (b)(2) and (c)(1)-(3) and amendment of Note filed 12-13-2007; operative 1-12-2008 (Register 2007, No. 50).

5. Amendment of subsection (c)(1) and Note filed 2-8-2008; operative 3-9-2008 (Register 2008, No. 6).

6. Editorial correction removing duplicate article heading and amending History 5 (Register 2008, No. 7).

Note

Note: Authority cited: Sections 100275, 116350, 116375 and 131200, Health and Safety Code. Reference: Sections 116270, 116275, 116365, 116375, 116385, 116390, 116400, 116525, 116530, 116535, 116540, 116550, 116555, 116625, 116735, 116750 and 131051, Health and Safety Code.