California Code of Regulations › Title 22 - Social Security › Division 4 - Environmental Health › Chapter 17 - Surface Water Treatment › Article 3 - Monitoring Requirements › Section 64656 - Disinfection Monitoring

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
				  To determine compliance with disinfection inactivation requirements specified
				  in section
				  64654(a), a
				  supplier shall develop and conduct a monitoring program to measure those
				  parameters that affect the performance of the disinfection process. This shall
				  include but not be limited to the temperature of the disinfected water, the
				  pH(s) of the disinfected water if chlorine is used as a disinfectant, the
				  disinfectant contact time(s) and the residual disinfectant concentration(s)
				  before or at the first customer. The monitoring program shall be described in
				  the operations plan required by section
				  64661.
(b) To determine compliance with the
				  performance standard specified in section
				  64654(b)(1), the
				  disinfectant residual concentration of the water being delivered to the
				  distribution system shall be measured and recorded continuously except as
				  provided in subsection (f).
(c) To
				  determine compliance with section
				  64654(b)(2), the
				  residual disinfectant concentration shall, at a minimum, be measured at the
				  same points in the distribution system and at the same time as total coliforms
				  are sampled in accordance with
				  22 CCR
				  sections 64423,
				  64424, and
				  64425, and described in the
				  operations plan required by section
				  64661, except as provided in
				  subsection (d).
(d) A supplier that
				  uses both an approved surface water and a groundwater may take disinfectant
				  residual samples at points other than those specified in subsection (c)
				  provided the supplier demonstrates to the State Board that such sampling points
				  are representative of the disinfected water in the distribution
				  system.
(e) If there is a failure
				  of continuous disinfectant residual monitoring equipment, grab sampling every
				  four hours may be conducted in lieu of continuous monitoring, but for no more
				  than five working days following the failure of the equipment.
(f) A supplier serving 3,300 or fewer persons
				  may collect and analyze grab samples of disinfectant residual each day as shown
				  below in lieu of the continuous monitoring specified in subsection (b),
				  provided that any time the residual disinfectant falls below 0.2 mg/L, the
				  supplier shall take a grab sample every four hours until the residual
				  concentration is equal to or greater than 0.2 mg/L:
System size by
								population
Samples/day
less than or equal to 500
1
501 - 1,000
2
1,001 - 2,500
3
2,501 - 3,300
4
(g)
				  A supplier shall describe the location and frequency of sampling to comply with
				  subsection (f) in the operations plan required by section
				  64661.
1. New
					 section filed 5-6-91; operative 6-5-91 (Register 91, No. 25).
2.
					 Amendment of section and NOTE filed 6-8-98; operative 7-8-98 (Register 98, No.
					 24).
3. Amendment of section heading, section and NOTE filed
					 5-22-2013; operative 7-1-2013 (Register 2013, No. 21).
4. Change
					 without regulatory effect amending subsection (d) and NOTE filed 6-2-2015
					 pursuant to section
					 100, title 1, California Code of
					 Regulations (Register 2015, No. 23).
5. Amendment of subsections
					 (c)-(d) filed 5-28-2021; operative 7-1-2021 (Register 2021, No.
					 22).
Note: Authority cited: Sections
						116271,
						116350
						and
						116375,
						Health and Safety Code. Reference: Sections
						116350,
						116375
						and
						116385,
						Health and Safety Code.