See the DWR web site for additional information on the State Model Ordinance:
DWR Water Efficient Landscape Ordinance website
In 1990, the California State Legislature passed AB 325 the Water Conservation in Landscaping Act, requiring all local agencies to adopt a Water Efficient Landscape Ordinance. The Department of Water Resources (DWR) developed a Model Water Efficient Landscape Ordinance. Jurisdictions could adopt the model or their own regulations.
In 2006, the legislature adopted the Water Conservation Landscaping Act (AB 1881) to improve State water efficiency requirements. AB 1881 ordered the Department of Water Resources to draft an updated Model Water Efficient Landscape Ordinance. All local agencies were required to adopt the Model Ordinance or an equivalent by January 1, 2010 (Government Code Section 65597).
In 2015, the State of California, through the Department of Water Resources (DWR) updated the State Model Water Efficient Landscape Ordinance per Governor’s Executive Order B-29-15. The Executive Order called for revising the Model Ordinance to increase water efficiency standards for new and retrofitted landscapes through more efficient irrigation systems, greywater usage, onsite storm water capture, and by limiting the portion of landscapes that can be covered in turf. It also requires reporting on the implementation and enforcement of local ordinances.
The Town of San Anselmo is required under state law to enforce the State model water efficient landscape ordinance since the town has not adopted its own ordinance that is at least as effective in conserving water as the department's updated model ordinance (California Government Code Section 65595(c)). Town residents are under the jurisdiction of the Marin Municipal Water District (MMWD) and MMWD has adopted a water conserving landscape ordinance that is more restrictive than the State model ordinance. Any landscape project at a site served by MMWD must comply with the Marin Municipal Water District (MMWD) Water Conserving Landscape requirements.