Health & Saf. Code, § 42405.5

(a) If any state or local government agency provides assistance in the investigation, data collection, or monitoring, preparation, or prosecution of an action to recover civil penalties pursuant to Section 42401, 42402, 42402.1, or 42402.2, and that assistance is provided in coordination with the state board or a district prosecuting the action, that agency shall be reimbursed out of the proceeds of the penalty collected for its costs and expenses incurred in providing the assistance.

(b) If the penalty collected is insufficient to fully reimburse the state board or district for the costs and expenses incurred in preparing and prosecuting the case and another agency or agencies for the costs and expenses incurred in assisting in the case, the amount collected shall be prorated among the state board or district and the assisting agency or agencies, on the basis of costs and expenses incurred by each.

(c) This section does not apply where there is an express agreement between the state board or district and another agency or agencies regarding reimbursement for assistance services and expenses.