Gov. Code, § 65596.5

(a) On or before January 1, 2020, and at least every three years thereafter, the department, after holding one or more public hearings, shall do one of the following:

(1) Update the model water-efficient landscape ordinance adopted pursuant to Chapter 1145 of the Statutes of 1990.

(2) Make a finding that an update to the model water-efficient landscape ordinance at that time is not a useful or effective means to improve either the efficiency of landscape water use or the administration of the ordinance.

(b) On or before January 1, 2020, and at least every three years thereafter, the department shall consider and propose revisions to the publication “Water Use Classification of Landscape Species” and its associated database as the director deems necessary or desirable to add unlisted plant taxa being offered for sale in California and to correct errors in existing listings.

(c) When the model water-efficient landscape ordinance has been updated, the department shall submit the update to the Building Standards Commission for consideration during the triennial revision process of the California Green Building Standards Code.