California Code, Health and Safety Code - HSC § 43020

(a) Any person who knowingly violates any regulation adopted pursuant to this part by the state board pertaining to motor vehicle fuels is guilty of a misdemeanor and is subject to a fine of not more than one thousand dollars ($1,000) or imprisonment in the county jail for not more than six months, or both, for each violation.

(b) The recovery of civil penalties pursuant to Section 43016 precludes prosecution pursuant to this section for the same offense. When the executive officer refers a violation to a prosecuting attorney, the filing of a criminal complaint is grounds requiring the dismissal of any civil action brought pursuant to Section 43016 for the same offense.