California Code, Health and Safety Code - HSC § 25205.18

(a) If a facility has a permit or an interim status document which sets forth the facility's allowable capacity for treatment or storage, the facility's size for purposes of the annual facility fee pursuant to Section 25205.2 shall be based upon that capacity, except as provided in subdivision (d).

(b) If a facility's allowable capacity changes or is initially established as a result of a permit modification, or a submission of a certification pursuant to subdivision (d), the fee that is due for the reporting period in which the change occurs shall be the higher fee.

(c) The department may require the facility to submit an application to modify its permit to provide for an allowable capacity.

(d) A facility may reduce its allowable capacity below the amounts specified in subdivision (a) or (c) by submitting a certification signed by the owner or operator in which the owner or operator pledges that the facility will not handle hazardous waste at a capacity above the amount specified in the certification. In that case, the facility's size for purposes of the annual facility fee pursuant to Section 25205.2 shall be based upon the capacity specified in the certification, until the certification is withdrawn. Exceeding the capacity limits specified in a certification that has not been withdrawn shall be a violation of the hazardous waste control law and may subject a facility or its operator to a penalty and corrective action as provided in this chapter.

(e) This section shall have no bearing on the imposition of the annual postclosure facility fee.