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New or revised landscaping for commercial buildings and homes in the unincorporated areas of Sonoma County, Calif., will need to comply with new rules on water efficiency.
The Water Efficient Landscape Ordinance applies to users of public water systems and groundwater. It requires landscape plan checks and inspections for commercial and industrial buildings, wineries, apartment complexes, new homes, and residences with additions larger than 400 feet.
It limits landscape irrigation to 60 percent of the water required by a similar-sized landscape composed entirely of lawn, a measurement of plant water demand called evapotranspiration, or ETo.
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Ordinance exemptions include home landscapes smaller than 5,000 square feet, designs with less than 600 square feet of turf and systems with a weather-based irrigation controller.
Source: www.northbaybusinessjournal.com
Francisco Uviña, University of New Mexico
Hardscape Oasis in Litchfield Park
Ash Nochian, Ph.D. Landscape Architect
November 12th, 2025
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