Propane (LP-gas) storage in Kennewick is regulated by the Washington State Fire Code (WAC 51-54A, adopting the 2021 IFC) and the Washington State Building Code's Fuel Gas Code (WAC 51-52, adopting the 2021 IFGC), as enforced locally under Kennewick Municipal Code (KMC) Chapter 15.30 (Fire Prevention Code) and KMC 15.08 (Building Code). IFC Chapter 61 references NFPA 58 (Liquefied Petroleum Gas Code) for tank setbacks, and IFC Section 6109.13 caps residential aggregate LP-gas storage on Group R-3 lots at 500 pounds water capacity (approximately 125 gallons of propane).
Kennewick adopts the Washington State Fire Code at WAC 51-54A through KMC Chapter 15.30, and the Washington State Building Code and Fuel Gas Code through KMC Chapter 15.08. IFC Chapter 61 (Liquefied Petroleum Gases) is the operative chapter for propane. IFC Section 6101.2 incorporates NFPA 58 (Liquefied Petroleum Gas Code) by reference, and NFPA 58 Table 6.4.1.1 governs tank setbacks: an above-ground propane tank with a water capacity of 125 gallons or less must be at least 10 feet from any important building; a 125 to 500-gallon tank must be at least 10 feet from the building and 10 feet from any other property line; and a 501 to 2,000-gallon tank must be at least 25 feet from buildings and property lines. IFC Section 6109.13 caps the aggregate amount of LP-gas stored on Group R-3 (one- and two-family) lots at 500 pounds water capacity (approximately 125 gallons of propane). IFC Section 6109.7 prohibits LP-gas storage inside dwelling units and restricts cylinders on combustible balconies of Group R-2 multifamily structures to a single 20-pound cylinder serving a listed grill. Gas piping and appliance installation must additionally comply with the Washington State Fuel Gas Code at WAC 51-52 (adopting the 2021 IFGC). Building permits for tank installations and gas piping are issued by the Kennewick Building Safety Division (509-585-4276). LP-gas installers must hold the appropriate Washington Department of Labor and Industries certification, and a Washington gas piping installer endorsement is required for piping work. Tanks must be set on a non-combustible pad, protected from vehicle impact where exposed, and labeled with the proper NFPA 704 placard. Underground tanks must additionally comply with NFPA 58 Section 6.6 burial-depth and corrosion-protection requirements. The Kennewick Fire Marshal may require an IFC operational permit under IFC Section 105.6 for any LP-gas storage above the residential aggregate threshold or for any commercial use.
Failure to obtain a required IFC operational permit, exceeding the 500-pound aggregate residential limit, or violating NFPA 58 setbacks are IFC violations enforced by the Kennewick Fire Marshal under KMC Chapter 15.30 and IFC Section 109. Civil and criminal penalties under KMC 15.30 and RCW 19.27 (State Building Code Act) are available, and tanks installed without permits may be ordered removed at the owner's expense. Gas-piping violations under WAC 51-52 are enforced through the Washington State Building Code permit process administered by the Kennewick Building Safety Division. Negligently or recklessly causing a fire or explosion through unlawful LP-gas storage can support criminal charges under RCW 9A.48.040 or RCW 9A.48.050 (Reckless burning), and an unlicensed installer may be subject to L&I civil penalties.
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