Operation of the GSWC-Los Osos South Bay Treatment Plant Water Supply Permit Amendment (Project)

The State Water Resources Control Board is overseeing the Operation of the GSWC-Los Osos South Bay Treatment Plant Water Supply Permit Amendment project. This initiative involves operating a manganese treatment system at an existing public water utility facility located at 2082 S. Bay Blvd., Los Osos, California, in San Luis Obispo County. The primary objective is to utilize drinking water treatment devices for health protection to address water quality levels that currently exceed secondary drinking water standards. The project is categorized as a forecast under NAICS code 221320. It has been granted a Notice of Exemption under Class 1 of the California Code of Regulations, as the work occurs within existing facilities with no change in use. Key points of contact include District Engineer Jason Cunningham and Water Quality Engineer David Schultise. A domestic water supply permit amendment for the project was issued on June 8, 2026.