California Code, Public Utilities Code - PUC § 4465

(a) If any operator subject to this chapter is in default of the payment of the surcharge required by this chapter for a period of 30 days or more, the commission may estimate from all available information the appropriate fee and may add to the amount of the estimated fee a penalty not to exceed 25 percent of the amount on account of the failure, refusal, or neglect to pay the fee, and the operator shall be estopped to complain of the amount of the commission's estimate.

(b) The commission may bring an action, in its own name or in the name of the people of the state, in any court of competent jurisdiction, for the collection of delinquent fees estimated under subdivision (a) of this section, together with a penalty of 25 percent for the delinquency.