1. (a) A free chlorine minimum residual of 0.5 mg/L must be maintained at the farthest end-use fixture(s). If chloramines are used to maintain disinfection residual, 0.7 mg/L total chlorine must be maintained at the farthest end-use fixture(s). The responsible entity must measure residual disinfectants weekly using a calibrated field meter.
2. (b) If the required disinfectant residual pursuant to subsection (a) is not met, the responsible entity must restore the disinfectant residual and retest within 48 hours upon discovery in accordance with the corrective action plan required in section 60686.

Note: Authority cited: Sections 13558 and 13558.1, Water Code; and Sections 116271 and 116350, Health and Safety Code. Reference: Sections 13558 and 13558.1, Water Code.

History

1. New section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).