California Code, Water Code - WAT § 6357.4

Before any certificate of approval is revoked by the department, the department shall hold a hearing.  Written notice of the time and place of the hearing shall be mailed, at least 20 days prior to the date set for the hearing, to the holder of the certificate.  Any interested persons may appear at the hearing and present their views and objections to the proposed action.  Any petition for a writ of mandate to inquire into the validity of action of the department revoking a certificate of approval shall be commenced within 30 days after service of notice of the revocation on the holder of the certificate.