California Code, Health and Safety Code - HSC § 78445

(a) The department may disclose information submitted pursuant to this article to authorized representatives, contractors, or other governmental agencies only in connection with the department's responsibilities pursuant to this part. The department shall establish procedures to ensure that information submitted pursuant to this article is used only in connection with these responsibilities and is not otherwise disseminated without the consent of the person who provided the information to the department.

(b) The department may also make available to the United States Environmental Protection Agency any information required by law to be furnished to that agency. The sharing of information between the department and that agency pursuant to this article does not constitute a waiver by the department or of any affected person of any privilege or confidentiality provided by law that pertains to the information.