Cal. Pub. Resources Code § 3771
In case of the failure or neglect on the part of any person to comply with any order of the supervisor or the director, or any subpoena, or upon the refusal of any witness to testify to any matter regarding which the person may lawfully be interrogated, or upon refusal or neglect to appear and attend at any proceeding or hearing on the day specified, after having received a written notice of not less than 10 days prior to the proceeding or hearing, or upon the person's failure, refusal or neglect to produce books, papers, or documents as demanded in the order or subpoena upon that day, that failure, refusal or neglect constitutes a misdemeanor. Each day's further failure, refusal, or neglect is a separate and distinct offense.
The district attorney of the county in which the proceeding, hearing, or investigation is to be held, shall prosecute any person guilty of violating this section by continuous prosecution until the person appears or attends or produces the books, papers, or documents, or complies with the subpoena or order of the supervisor or the director.
Ca. Pub. Res. Code § 3771