Pub. Resources Code, § 40055

(a) This division, or any rules or regulations adopted pursuant thereto, is not a limitation on the power of any state agency in the enforcement or administration of any provision of law which it is specifically authorized or required to enforce or administer, including, but not limited to, the exercise by the state water board or the regional water boards of any of their powers and duties pursuant to Division 7 (commencing with Section 13000) of the Water Code, the exercise by the Department of Toxic Substances Control of any of its powers and duties pursuant to Chapter 6.5 (commencing with Section 25100) of Division 20 of the Health and Safety Code, and the exercise by the State Air Resources Board or any air pollution control district or air quality management district of any of its powers and duties pursuant to Division 26 (commencing with Section 39000) of the Health and Safety Code.

(b) The exercise of authority under this division, including, but not limited to, the adoption of regulations, plans, permits, or standards or the taking of any enforcement actions shall not duplicate or be in conflict with any determination relating to water quality control made by the state water board or regional water boards, including requirements in regulations adopted by or under the authority of the state water board.

(c) Any plans, permits, standards, or corrective action taken under this division shall be consistent with all applicable water quality control plans adopted pursuant to Section 13170, and Article 3 (commencing with Section 13240) of Chapter 4 of Division 7, of the Water Code and the state policies for water quality control adopted pursuant to Article 3 (commencing with Section 13140) of Chapter 3 of Division 7 of the Water Code existing at the time of the action or proposed action.