Cal. Pub. Res. Code § 5566

It is the intent of the Legislature to provide a district with authority to impose special taxes. A district may impose special taxes pursuant to the procedures set forth in Article 3.5 (commencing with Section 50075) of Chapter 1 of Part 1 of Division 1 of Title 5 of the Government Code. In exercising that authority, a district may establish a zone or zones and a rate of tax for each zone, which is to be applied uniformly to all taxpayers within the zone. All revenue from a tax levied in a zone shall be expended in connection with land and facilities that are located in that zone, including a reasonable amount thereof allocated for general administrative expenses of the district.