Water Code § 13286.9
ARTICLE 5. Individual Disposal Systems
On and after the date determined by the Santa Ana Regional Water Quality Control Board, or January 1, 2013, whichever is earlier, all wastewater discharged by the Orange County Sanitation District into the Pacific Ocean shall be subject to at least secondary treatment requirements pursuant to subparagraph (B) of paragraph (1) of subsection (b) of Section 301 of the Clean Water Act (33 U.S.C. Sec. 1311(b)(1)(B)), and any more stringent requirements determined to be appropriate by the state board or that regional board.