Los Angeles County Municipal Code § 507.2 Type of water supply

A water supply shall consist of reservoirs, pressure tanks, elevated tanks, water mains or other fixed systems capable of reliably providing the required fire flow. Facilities, buildings, or portions of buildings that are hereafter constructed or moved into or within the jurisdiction, that are located within a water district's or water utility's service area, and that can receive a

fire-flow certificate upon satisfactory completion of facilities improvements from the applicable water district or water utility, shall obtain their required fire flow from that water district's or water utility's system.

Water tanks, and associated structures and piping, for private fire protection shall be installed and maintained in accordance with NFPA 22, and as specified by the fire code official.