California Code, Health and Safety Code - HSC § 39687

(a) The state board or the administering agency shall require that fleet purchasers receiving an incentive sign contracts conditioning any incentive received on compliance with this chapter.

(b) The contract entered into pursuant to subdivision (a) shall state a timeframe for fleet purchasers' compliance with standards under this chapter, that includes the application process and a multiyear period after receiving the incentive of at least three years or the duration of the loan, grant, or incentive received, whichever is longer.