18 AAC 80.035. Disinfection of a nonsurface water source

(a) This section applies to public water systems with a source of water that is not surface water or GWUDISW, including

(1) water haulers;

(2) repealed 3/25/2001;

(3) seawater systems; and

(4) groundwater systems.

(b) The department will require the owner or operator of a public water system to install and maintain continuous disinfection if the department determines that continuous disinfection is necessary to protect public health and

(1) the department is aware of a sanitary defect;

(2) the system is in violation of the MCL for total coliform bacteria set by 18 AAC 80.300(b) (5); or

(3) the department determines that a significant potential exists for violation of the MCL for total coliform bacteria set by 18 AAC 80.300(b) (5).

(1) monitor the system daily to maintain a residual disinfectant concentration of not less than 0.2 mg/l in the water entering the distribution system; if the residual disinfectant concentration in a system using grab sampling instead of continuous monitoring falls below 0.2 mg/l, the owner or operator shall take a grab sample at least every four hours until the concentration is raised to 0.2 mg/l or higher;

(2) maintain a detectable residual disinfectant concentration in the distribution system, as follows:

(A) the concentration must be measured at the same frequency and locations required for total coliforms in 18 AAC 80.405;

(B) the concentration may not be undetectable in more than five percent of the samples each month for two consecutive months during which the system serves water to the public;

(C) the heterotrophic plate count (HPC) may be measured as described in 18 AAC 80.1100(k) instead of residual disinfectant concentration; water in the distribution system with a heterotrophic bacteria density less than or equal to 500 per ml is considered a detectable residual for purposes of determining compliance with this paragraph; and

(3) report the monitoring results required by this section to the department within 10 days after the last day of each month during which the system serves water to the public, subject to the report certification requirements of 18 AAC 80.1900.

History: Eff. 10/1/99, Register 151; am 3/25/2001, Register 157

Authority: AS 46.03.020

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