Noxious weeds designated by the Contra Costa County Agricultural Commissioner under California Food and Agricultural Code Section 5004 must be controlled on private property. Common San Ramon targets include yellow starthistle, Italian thistle, French and Scotch broom, and artichoke thistle. Enforcement is handled by the county with city abatement backstop.
California Food and Agricultural Code Section 5004 gives the California Department of Food and Agriculture and each county agricultural commissioner authority to designate and enforce noxious weed controls. In Contra Costa County, the Department of Agriculture-Weights and Measures maintains a local noxious weed list and conducts inspections and educational outreach. Common noxious weeds found in and around San Ramon include yellow starthistle (Centaurea solstitialis), Italian thistle, milk thistle, artichoke thistle, French broom (Genista monspessulana), Scotch broom (Cytisus scoparius), and perennial pepperweed. These species spread aggressively, displace native vegetation, increase fire hazard, and reduce habitat value. Property owners are expected to prevent the spread of A-rated and B-rated noxious weeds. Where infestations threaten adjacent properties, open space, or agricultural lands, the County Agricultural Commissioner may issue a control order. Non-compliance can lead to county-directed abatement with costs recovered from the owner. At the local level, San Ramon can additionally treat noxious weed infestations as a public nuisance under Government Code Section 39561. Residents in hillside and open space-adjacent properties should coordinate with neighbors and groups like Save Mount Diablo for invasive plant removal. The East Bay Regional Park District runs volunteer restoration days in nearby Las Trampas and Bishop Ranch Regional Preserve.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Contra Costa County.
See how other cities in Contra Costa County handle weed ordinances.
See how San Ramon's weed ordinances rules stack up against other locations.
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