Cal. Wat. Code § 35410.1
In addition to and as an alternative procedure to the levy and collection of assessments and standby charges, a district may fix and collect acreage assessments in an amount determined by the board for each acre of land and for parcels less than one acre within a district or improvement district. These acreage assessments shall be levied only for the payment of the whole or any part of a metropolitan water district tax. The resolution fixing the acreage assessment shall be adopted by the board only after adoption of a resolution setting forth the schedule of such acreage assessments proposed to be established and after notice and hearing in the form and manner prescribed by the board. The acreage assessment shall be levied, collected and enforced in the same manner as provided in Article 4 (commencing with Section 35470) of this chapter for standby charges.
Ca. Water Code § 35410.1