California Code, Health and Safety Code - HSC § 25299.74

(a) No indemnification, hold harmless, conveyance, or similar agreement shall be effective to preclude any liability for costs recoverable under this article. This section does not bar any agreement to insure, hold harmless, or indemnify a party to the agreement for any costs under this chapter.

(b) The entry of judgment against any party to the action does not bar any future action by the fund against any person who is later discovered to be potentially liable for costs paid from the fund.

(c) Payment of any claim by the fund pursuant to this chapter shall be subject to the state acquiring by subrogation the rights of the claimant to recover those costs of corrective action for which it has compensated the claimant from the person responsible or liable for the unauthorized release.