Landscaping Rules in Napa County, CA (2026)

Napa County Code Sec. 8.36.060 (Duty to maintain defensible space and abate public nuisances)

Property owners shall maintain a defensible space as defined by this chapter and in the Defensible Space Guidelines. The following conditions within the unincorporated area of Napa County are declared to be nuisances and shall be abated by the owner of each parcel or property where such conditions exist, at the [owner's] sole expense: A. The presence of prohibited materials within the defensibl...

Napa County Code Sec. 8.36.030 (Definitions)

'Weeds' means and includes any of the following: 1. Weeds that bear seeds of a downy or wingy nature; 2. Sagebrush, chaparral, and any other brush or weeds that attain such hard growth as to become, when dry, a fire hazard; 3. Weeds and grasses that are otherwise noxious; 4. Poison oak when the conditions of growth are such as to constitute a menace to the public health; or 5. Dry grass, stubbl...

Napa County Water Efficient Landscaping Application and Guidance, Section A1 (Applicability) - implementing Napa County Code Chapter 18.118

Use the table below to determine if the Water Efficient Landscape Ordinance (WELO) applies to your project. 1. Does the project require a building permit from the County? 2. Is new or rehabilitated landscaping either provided and/or required as part of the building plans or conditions of approval for the project? 3. Is this a public agency, private development, or developer installed project wi...