Residential propane storage in King County follows the Washington-adopted International Fire Code under RCW 19.27, capping non-permitted home cylinders and requiring permits for larger tanks from the Washington State Patrol Fire Marshal or local fire authority.
Propane storage in King County is governed by the International Fire Code (IFC) Chapter 61 as adopted statewide under RCW 19.27 (Washington State Building Code). Residential properties may keep limited propane (typically up to a few hundred pounds aggregate) without a permit; larger stationary tanks require approval from the local fire authority, which in unincorporated King County is the serving fire district, and in cities like Seattle is the Seattle Fire Department. Tanks must meet clearance distances from buildings, ignition sources, and property lines. The Washington State Patrol Office of the State Fire Marshal sets statewide LPG handling standards.
Storing propane above the IFC residential threshold without a permit, or violating clearance and labeling rules, is a fire-code violation that can trigger fines and required tank removal.
See how King County's propane storage rules stack up against other locations.
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