Cal. Wat. Code § 71631.5
Notwithstanding Section 71631, in any improvement district situated within the Eastern Municipal Water District, the Western Municipal Water District of Riverside County, the Elsinore Valley Municipal Water District, the Rincon Del Diablo Municipal Water District, the Ramona Municipal Water District, the Rainbow Municipal Water District, or the Lake Hemet Municipal Water District, the standby assessment or availability charge shall not exceed thirty dollars ($30) per acre per year for land on which the charge is levied or thirty dollars ($30) per year for a parcel less than one acre. In any such improvement district, the proceeds from any standby assessment or availability charge in excess of ten dollars ($10) per acre per year or ten dollars ($10) per year for a parcel less than one acre shall only be used for the purposes of such improvement district.
This section, applicable only to the Eastern Municipal Water District, the Western Municipal Water District of Riverside County, the Elsinore Valley Municipal Water District, the Rincon Del Diablo Municipal Water District, the Ramona Municipal Water District, the Rainbow Municipal Water District, and the Lake Hemet Municipal Water District, is necessary because of the unique and special water management problems of those areas included within those districts.
Ca. Water Code § 71631.5