Residential propane storage in unincorporated Solano County follows the California Fire Code (Chapter 61) and NFPA 58, which the County adopted in its 2025 code. Above-ground tanks under 125 gallons must be at least 10 feet from buildings; larger tanks need greater setbacks. Containers may not be stored in basements or below-grade spaces, and large quantities require a fire-department permit.
Solano County adopted the 2025 California Fire Code, whose Chapter 61 (Liquefied Petroleum Gases), together with NFPA 58 (Liquefied Petroleum Gas Code as adopted by California), governs propane storage and equipment in the unincorporated area. Under CFC Table 6104.3, above-ground LP-gas containers must be separated from buildings and property lines based on water capacity: containers under 125 gallons and those in the 125-250 and 251-500 gallon ranges generally require at least 10 feet of separation, while 501-2,000 gallon containers require at least 25 feet. LP-gas containers must not be stored in pits, basements, or other below-grade spaces where heavier-than-air gas can collect. For portable container storage at consumer sites (Section 6109), limits apply - for example a maximum aggregate of about 735 pounds of LP-gas per storage location inside non-public buildings. An operational permit from the fire code official is required for larger installations (CFC 6101.2 sets permit thresholds, generally for a single container over 2,000 gallons or aggregate over 4,000 gallons; local fire authorities may set lower permit thresholds). In Very High Fire Hazard Severity Zones, defensible-space clearance (PRC 4291) around tanks is also expected. Typical BBQ-size cylinders (about 20 lb / nominal capacity) are not generally permit-regulated but must be stored and used safely outdoors.
Tanks installed without required setbacks, in prohibited below-grade locations, or without a required operational permit violate the adopted California Fire Code and may be ordered relocated or removed at the owner's expense. The fire code official may issue stop-use orders. An owner can be liable for response and suppression costs under California Health & Safety Code 13009 if a propane leak or fire spreads.
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