Much of unincorporated Solano County β including the Vaca Mountains, the western hills around Green Valley and Cordelia, the area around Lake Berryessa, and rural land north and east of Vacaville β is mapped in CAL FIRE's State Responsibility Area (SRA) and Local Responsibility Area (LRA) as Moderate, High, or Very High Fire Hazard Severity Zones (FHSZ). On February 24, 2025 the State Fire Marshal released updated LRA FHSZ maps for Solano; the County adopted them with enforcement beginning July 2025. Map zone determines defensible-space requirements (PRC Β§4291 / Govt. Code Β§51182), Chapter 7A ignition-resistant construction standards, and Real-Estate disclosure (Civil Code Β§1103).
Fire Hazard Severity Zones in Solano County are split between two responsibility categories. CAL FIRE LNU is the State Responsibility Area (SRA) agency: SRA covers most rural and wildland portions of the county and is mapped under PRC Β§4201 et seq. The Local Responsibility Area (LRA) is everything inside city boundaries plus areas where the County or a local fire district provides primary structural protection; LRA FHSZ maps were updated by the Office of the State Fire Marshal on February 24, 2025 and adopted locally. Within SRA, all three classifications (Moderate, High, Very High) trigger PRC Β§4291 100-foot defensible space and California Building Code Chapter 7A wildland-urban-interface (WUI) construction standards for new construction and substantial remodels β ignition-resistant exterior siding, ember-resistant vents, Class A roofing, decking, and dual-pane tempered windows. Within LRA, only the Very High FHSZ historically triggered the same standards; the updated 2025 maps expand mapped Moderate and High zones, and Solano County's adopted ordinance now extends building requirements as listed in its Chapter 6.3 amendments. Real-estate transfer disclosures under California Civil Code Β§1103 require sellers to disclose if a property is in a designated SRA or VHFHSZ. The 2020 LNU Lightning Complex fires (which originated in Solano and adjacent counties on Aug 17, 2020 and ultimately burned ~363,000 acres) drove this expanded mapping effort.
Building or substantially remodeling in a mapped FHSZ without complying with Chapter 7A WUI standards is a building-code violation: Solano County Building & Safety can issue a stop-work order and require corrective construction. Failure to maintain PRC Β§4291 defensible space carries CAL FIRE civil penalties up to $500 (first offense) and $1,500 (second offense). Sellers who fail to deliver the required FHSZ disclosure can face civil liability under Civil Code Β§1103.
Solano County, CA
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Solano County, CA
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Solano County, CA
Solano County Code Β§4-73 declares any dog, cat, fowl, or other animal that 'by habitual howling, yelping, barking or other noise disturbs or annoys persons i...
Solano County, CA
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Solano County, CA
Unincorporated Solano County enforces nighttime quiet hours through Solano County Code Β§21-10 (Disturbing the Peace). Any non-agricultural noise that exceeds...
Solano County, CA
In unincorporated Solano County, commercial vehicles associated with a home-based business are limited by Solano County Code Β§28.72.40 (Home Occupations). Ty...
See how Solano County's wildfire zones rules stack up against other locations.
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