Cal. Pub. Resources Code § 3359
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 he 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 such proceeding or hearing, or upon his failure, refusal, or neglect to produce books, papers, or documents as demanded in the order or subpoena upon such day, such failure, refusal, or neglect shall constitute 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 such books, papers, or documents, or complies with the subpoena or order of the supervisor or the director.
Ca. Pub. Res. Code § 3359