Cal. Water Code § 13265
(b)
(c) Any person discharging hazardous waste, as defined in Section 25117 of the Health and Safety Code, in violation of Section 13264 is guilty of a misdemeanor and may be liable civilly in accordance with subdivision (d). That liability shall not be imposed if the discharger is not negligent and immediately files a report of the discharge with the board, or if the regional board determines that the violation of Section 13264 was insubstantial.
This subdivision shall not be applicable to any waste discharge which is subject to Chapter 5.5 (commencing with Section 13370).
(d)