Snohomish County has adopted the 2018 International Fire Code (SCC 30.53A.010), which governs liquefied-petroleum (propane) gas storage, container sizes, and installation. Small residential grill and heater cylinders are exempt from permits, but larger LP-gas storage requires code compliance and, above thresholds, a fire-code permit.
The county does not write its own propane rules; instead SCC 30.53A.010 adopts the 2018 International Fire Code (except chapter 1) as amended by the Washington State Building Code Council. IFC Chapter 61 sets LP-gas requirements for container placement, separation distances, and aggregate quantities. Typical backyard grill and patio-heater cylinders (roughly 20-100 lb capacity) are handled under manufacturer and IFC installation rules without a permit; larger residential or bulk LP-gas storage triggers IFC permitting and separation standards. For a specific installation, contact the Snohomish County Fire Marshal, who administers the adopted fire code in the unincorporated county.
Enforced under the adopted fire code; fire-code violations are subject to penalties as prescribed by law and chapter 30.85 SCC, and the fire marshal may order correction or removal of non-compliant storage.
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See how Snohomish County's propane storage rules stack up against other locations.
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