California Code, Public Resources Code - PRC § 13215

The district may, pursuant to the notice, protest, and hearing procedures in Section 53753 of the Government Code, fix by ordinance or resolution, on or before the first day of July in each calendar year, water or sewer standby or immediate availability charges.  Each such charge shall not individually exceed twelve dollars ($12) per year for each acre of land, or eight dollars ($8) per year for each parcel of land of less than an acre within the district to which water or sewerage could be made available for any purpose by the district, whether the water or sewerage is actually used or not, unless the standby charge is imposed pursuant to the Uniform Standby Charge Procedures Act (Chapter 12.4 (commencing with Section 54984) of Part 1 of Division 2 of Title 5 of the Government Code). The district board may establish schedules varying the charges depending upon factors such as the uses to which the land is put, the cost of supplying such services to the land, and the amount of services used on the land.  The district board may restrict the imposition of such charges to lands lying within one or more improvement districts within the district.

The limitations contained in this section shall not apply to any district which levied a standby charge pursuant to the County Service Area Law (Chapter 2.5 (commencing with Section 25210) of Part 2 of Division 2 of Title 3 of the Government Code) prior to January 1, 1977.  Any such district shall be subject to Section 25215.6 of the Government Code.