Cowlitz County, WA Fire Regulations: Propane Storage (2026)
Key Facts
- Bulk LPG cap
- 2,000 gallons water capacity
- Allowed zones
- C-1, C-2, ML, MH only
- Permit-free cylinder size
- 25 gallons or less
- Enforcing agency
- Cowlitz County Fire Marshal
- Governing code
- 2021 IFC, CCC § 16.05.080
Summary
In unincorporated Cowlitz County, bulk liquefied petroleum gas storage is confined to property zoned Neighborhood Commercial (C-1), Urban Commercial (C-2), Light Manufacturing (ML) or Heavy Manufacturing (MH), and any single LPG installation is capped at 2,000 gallons water capacity. Home LP-gas cylinders over 25 gallons need a construction permit.
Section 105.6.15 is amended to read as follows: LP-gas. A construction permit is required for installation of or modification to an LP-gas system. Maintenance performed in accordance with this code is not considered to be an alteration and does not require a permit. Exception: Above-ground portable LP-gas cylinders not in excess of 25 gallons water capacity shall not require a permit. ... Section 6104.2 is amended to read as follows: The bulk storage of liquefied petroleum gas (LPG) in areas zoned pursuant to CCC Chapter 18.10, Land Use Ordinance, is permitted only on property zoned as Neighborhood Commercial (C-1), Urban Commercial (C-2), Light Manufacturing (ML), or Heavy Manufacturing (MH). The aggregate capacity of any one installation of LPG storage in zoned areas shall not exceed 2,000 gallons water capacity; except that in particular installations, this capacity limit may be altered at the discretion of the fire marshal, after consideration of special features such as topographical conditions, nature of occupancy and proximity to buildings, capacity of proposed tanks, degree of private fire protection to be provided, and facilities of the local Fire Department.
Full Breakdown
10. Any single LPG installation in one of those zones is capped at 2,000 gallons of water capacity. The Fire Marshal can raise that cap on a case-by-case basis after weighing topography, the type of occupancy nearby, the size of the proposed tanks, how much private fire protection the site already has, and what the local fire department can bring to bear, so a larger farm or industrial tank is possible only with that individualized review. Outside those four commercial and industrial zones, including the rural residential and unzoned areas that cover much of the county, bulk LPG storage does not have a path to approval under this section.
15 requires a construction permit before installing or modifying an LP-gas system, but the county carves out an exception for above-ground portable LP-gas cylinders holding 25 gallons of water capacity or less, the size of a typical grill or small barbecue tank, which need no permit at all. Anything larger, such as a standard 250-gallon or 500-gallon residential propane tank feeding a furnace or water heater, requires a permit through the Department of Building and Planning before the tank goes in or is modified. Maintenance performed under the code's own terms is not treated as an alteration and stays permit-free.
Violations & Fines
Installing or modifying an LP-gas system without the required construction permit, or siting bulk LPG storage outside the C-1, C-2, ML or MH zones, is a fire code violation enforced by the Cowlitz County Fire Marshal and Department of Building and Planning, which can require the installation reduced back to the 2,000-gallon cap absent a documented case-by-case exception, or relocated to a compliant zone.
Frequently Asked Questions
Can I store a large propane tank on rural residential property in unincorporated Cowlitz County?
Do I need a permit for my home's propane tank?
What is the maximum LPG storage allowed at one installation?
Sources & Official References
Other rules in Cowlitz County
Compare Cowlitz County to another location·View the Washington fire regulations overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.