Cal. Water Code § 22123

Any district providing electric power to areas outside its boundaries shall be subject to reasonable rules, regulations, and orders of the governing body of the city or county area being served, but, in no event, more restrictive than the rules, regulations, and orders of the Public Utilities Commission upon utilities providing electric power to cities or counties. No district may impose rates, rules, regulations, or orders in any such area outside its boundaries which are different from rates, rules, regulations, or orders imposed within the district, except with the consent of the governing body of the affected area.