Cal. Water Code - WAT § 535. Section 535.
(a)
A water purveyor shall require as a condition of new retail water service on and after January 1, 2008, the installation of separate water meters to measure the volume of water used exclusively for landscape purposes.
(b)
Subdivision (a) does not apply to either of the following:
(1)
Single-family residential connections.
(2)
Connections used to supply water for the commercial production of agricultural crops or livestock.
(c)
Subdivision (a) applies only to a service connection for which both of the following apply:
(1)
The connection serves property with more than 5,000 square feet of irrigated landscape.
(2)
The connection is supplied by a water purveyor that serves 15 or more service connections.
(d)
For the purposes of this section, “new retail water service” means the installation of a new water meter where water service has not been previously provided, and does not include applications for new water service submitted before January 1, 2007.