Cal. Health & Saf. Code § 25204.5
Any action taken by the department pursuant to this article shall be consistent with all applicable regulations adopted by the State Water Resources Control Board, all applicable water quality control plans adopted pursuant to Section 13170 of the Water Code and Article 3 (commencing with Section 13240) of Chapter 4 of Division 7 of the Water Code, and all applicable 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, to the extent the department determines that those regulations, plans, and policies are not less stringent than this chapter and the regulations adopted pursuant to this chapter. The department shall also incorporate, as a condition of any permit issued, amended, or renewed under this chapter, any waste discharge requirements issued by the State Water Resources Control Board or a California regional water quality control board and any conditions imposed pursuant to Section 13227 of the Water Code, to the extent the department determines those waste discharge requirements, requirements, and limitations are not less stringent than this chapter and the regulations adopted pursuant to this chapter. The department may set more stringent requirements or limitations which the department determines are necessary or appropriate to carry out this chapter.
Ca. Health and Saf. Code § 25204.5