1. (a) An OTNWS with a UV disinfection process must be equipped with a built-in automatic reliability feature that is triggered when the measured UV dose is below the required minimum UV dose. If the measured UV dose goes below the required minimum UV dose, the SCADA system must automatically start up the next available UV lamp bank or reactor. If no redundant lamp bank or reactor is available, the SCADA system must initiate automatic diversion pursuant to section 60672.

2. (b) An OTNWS with a chlorine disinfection process must have reliability features for uninterrupted chlorine feed listed in this subsection. In the absence of these reliability features, the SCADA system must be capable of initiating automatic diversion pursuant to section 60672.

   1. (1) Standby chlorine supply;
   2. (2) Chlorine metering pump; and
   3. (3) Automatic residual control of chlorine dosage and automatic measuring and recording of chlorine residual.
3. (c) An OTNWS using a disinfection unit process other than a chlorine disinfection process or UV disinfection process must describe and propose reliability features to ensure uninterrupted pathogen inactivation or removal in the engineering report pursuant to section 60680.

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).