Propane/LP-gas tanks in unincorporated Boulder County follow the adopted 2021 International Fire Code. Tanks up to 500 gallons must be at least 10 feet from buildings and property lines; larger tanks need 25-50 feet. Keep vegetation within 10 feet of the tank cleared and never place a tank under a
Boulder County publication B23 applies IFC Section 6104 clearance requirements. Above-ground tanks up to 500 gallons need a minimum 10-foot separation from buildings and property lines; 501-2,000 gallon tanks need 25 feet; and 2,001-30,000 gallon tanks need 50 feet. Underground tanks require at least 10 feet from buildings or adjoining lot lines at all points. For wildfire safety the county requires keeping combustible materials away, clearing vegetation within 10 feet of the tank, and not placing the tank directly under a tree. Tanks are typically set on a concrete pad.
Enforced through building/mechanical permit inspections; noncompliant installations must be corrected before approval.
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See how Boulder County's propane storage rules stack up against other locations.
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