California Code, Public Utilities Code - PUC § 5413.5

(a) Whenever the commission, after hearing, finds that any person or corporation is operating as a charter-party carrier of passengers, including a charter-party carrier operating a limousine, without a valid certificate or permit, or fails to include in any written or oral advertisement the number of the certificate or permit required by Section 5386, the commission may impose a fine of not more than seven thousand five hundred dollars ($7,500) for each violation.  The commission may assess the person or corporation an amount sufficient to cover the reasonable expense of investigation incurred by the commission.  The commission may assess interest on any fine or assessment imposed, to commence on the day the payment of the fine or assessment becomes delinquent.  All fines, assessments, and interest collected shall be deposited at least once each month in the General Fund.

(b) Whenever the commission, after hearing, finds that any person or corporation is operating a charter-party carrier of passengers as a taxicab without a valid certificate or permit in violation of an ordinance or resolution of a city, county, or city and county, the commission may impose a fine of not more than five thousand dollars ($5,000) for each violation.  The commission may assess the person or corporation an amount sufficient to cover the reasonable expense of investigation incurred by the commission.  The commission may assess interest on any fine or assessment imposed, to commence on the day the payment of the fine or assessment becomes delinquent.  All fines, assessments, and interest collected shall be deposited at least once each month in the General Fund.