California Code, Health and Safety Code - HSC § 25202

(a) The owner or operator of a hazardous waste facility who holds a hazardous waste facilities permit or a grant of interim status shall comply with the conditions of the hazardous waste facilities permit or interim status document, the requirements of this chapter, and with the regulations adopted by the department pursuant to this chapter, including regulations which become effective after the issuance of the permit or grant of interim status.

Notwithstanding any term or condition in a hazardous waste facilities permit or interim status document, the department may adopt or amend regulations which impose additional or more stringent requirements than those existing at the time the permit or interim status document was issued. The department may enforce both the permit or interim status document and additional or more stringent requirements against the owner or operator of a facility.

(b) The amendment of this section made by Chapter 1126 of the Statutes of 1991 does not constitute a change in, but is declaratory of, the existing law.