4 county-level rules, plus city-specific rules for 3 cities in Solano County, California.
Verified from official government sources
Solano County does not set a specific inch-limit for residential grass height. Tall dry grass and weeds are regulated indirectly through county fire-hazard weed abatement and the agricultural commissioner's noxious-weed program, and through California Public Resources Code Section 4291, which requires 100 feet of defensible space around buildings in State Responsibility Areas.
Unincorporated Solano County does not have a heritage-tree or general tree-removal ordinance in its County Code. Trees on private property may generally be removed without a county permit, subject to grading rules in Chapter 31 (Grading, Drainage, Land Leveling, and Erosion Control) and any tree-mitigation conditions attached through Chapter 28 (Zoning) discretionary permits. Incorporated cities differ sharply - Benicia and Vacaville each protect heritage or significant trees by permit.
Solano County controls weeds through two tracks: (1) the Solano County Agricultural Commissioner's Weed Management Area (WMA) program targeting state-listed noxious weeds under California Food & Agricultural Code Section 5004, and (2) general nuisance abatement under California Government Code Section 39561 et seq. for overgrown lots. Defensible space under PRC 4291 layers in on rural parcels. There is no single 'weed ordinance' chapter in the County Code.
Solano County enforces a Water Efficient Landscape Ordinance (WELO) consistent with California's Model Water Efficient Landscape Ordinance (Cal. Code Regs. Title 23, Section 490 et seq.). New residential landscapes over 500 sq ft and rehabilitated landscapes over 2,500 sq ft must submit landscape and irrigation plans to Solano County Planning Services. Statewide prohibitions on runoff irrigation, hose-washing without a shutoff nozzle, and decorative non-recirculating fountains also apply.
3 cities in Solano County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.
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