Cal. Wat. Code § 12232 : CALIFORNIA WATER CODE — CONSERVATION, DEVELOPMENT, AND UTILIZATION OF STATE WATER RESOURCES — SAN JOAQUIN RIVER — No causation of further degradation of quality of water

The State Water Resources Control Board, the State Department of Water Resources, the California Water Commission, and any other agency of the state having jurisdiction, shall do nothing, in connection with their responsibilities, to cause further significant degradation of the quality of water in that portion of the San Joaquin River between the points specified in Section 12230.