Cal. Health and Safety Code § 25173

The department shall establish procedures to ensure that trade secrets used by a person regarding methods of hazardous waste handling and disposal are utilized by the director, the department, or any authorized representative of the department only in connection with the responsibilities of the department pursuant to this chapter and that such trade secrets are not otherwise disseminated by the director, the department, or any authorized representative of the department without the consent of the person. However, any information shall be made available to governmental agencies for use in making studies and for use in judicial review or enforcement proceedings involving the person furnishing the information. “Trade secrets,” as used in this section, may include, but are not limited to, any formula, plan, pattern, process, tool, mechanism, compound, procedure, production data, or compilation of information which is not patented, which is known only to certain individuals within a commercial concern who are using it to fabricate, produce, or compound an article of trade or a service having commercial value, and which gives its user an opportunity to obtain a business advantage over competitors who do not know or use it.