Cal. Health & Safety Code § 25180.5

(a) The department, the State Water Resources Control Board, and the California regional water quality control boards shall notify the local health officer and director of environmental health of a county, city, or district, and the CUPA for the jurisdiction as specified in subdivision (b), within 15 days after any of the following occur:
1. (1) The department’s or board’s employees are informed or discover that a disposal of hazardous waste has occurred within that county, city, or district and that the disposal violates a state or local law, ordinance, regulation, rule, license, or permit or that the disposal is potentially hazardous to the public health or the environment.
2. (2) The department or board proposes to issue an abatement order or a cease and desist order, to file a civil or criminal action, or to settle a civil or criminal action, concerning a disposal of hazardous waste within that county, city, or district.
(b) The notice given by the department or board pursuant to subdivision (a) shall include all test results and any relevant information which the department or board has obtained and which do not contain trade secrets, as defined by Section 25173, as determined by the department or board. If the department or board determines that the test results or information cannot be disseminated because of current or potential litigation, the department or board shall inform the local health officer, the director of environmental health, and the CUPA for the jurisdiction that the test results and information shall be used by the local health officer, the director of environmental health, and the unified program agencies, only in connection with their statutory responsibilities and shall not otherwise be released to the public.
(c) The department, the State Water Resources Control Board, and the California regional water quality control boards shall coordinate with the unified program agencies regarding violations of this chapter, or violations of regulations adopted pursuant to this chapter, at a unified program facility.