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Thurston County, WA Fire Regulations: Propane Storage (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Permit required: Operational permit for any LP-gas system install
Residential exemption: Up to 500 gallons water capacity, IRC dwellings
Unpermitted work fee: Doubled permit and plan review fee
Maximum penalty: $1,000 fine and/or 90 days jail
Governing code: International Fire Code as amended, TCC Ch. 14.32

Summary

Thurston County requires an operational permit under Fire Code § [A] 105.6.27 before installing any LP-gas system, administered by the Community Planning and Economic Development Department. Residential propane tanks are exempt from the permit up to 500 gallons of water capacity, single tank or combined, when serving a dwelling built under the International Residential Code.

These county ordinances apply to unincorporated areas of Thurston County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

[A] 105.6.27 LP-gas. An operations permit is required for the installation of an LP-gas system. Exception: Liquid petroleum gas (LP-gas) storage tanks of five hundred gallons or less or multiple containers systems having an aggregate quantity not exceeding 500 gallons water capacity used in conjunction with a dwelling unit constructed under the International Residential Code and their accessory structures.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 77).

Full Breakdown

27 to require an operational permit for installing any liquid petroleum gas (LP-gas) system in the county. 32 TCC. A residential exception exempts homeowners from the permit: LP-gas storage tanks of 500 gallons or less, or multiple-container systems with a combined water capacity not exceeding 500 gallons, used with a dwelling unit built under the International Residential Code and its accessory structures, do not need an operations permit. Anything above that threshold, or LP-gas installations serving commercial, industrial or multifamily buildings outside the residential exception, requires the permit before the system is installed. 2; permits are not transferable, so a change in occupancy, operation or ownership triggers a new application. 3. 17 TCC.

Violations & Fines

Installing an LP-gas system before obtaining the required operational permit triggers a fee equal to twice the applicable permit and plan review fees under Fire Code § [A] 113.3 (TCC 14.32.060). General fire code violations, including operating without a required permit, are a misdemeanor under § [A] 109.3 (TCC 14.32.050): a fine of up to $1,000, up to 90 days in jail, or both, with each day of continued violation charged as a separate offense.

Frequently Asked Questions

Do I need a permit to install a propane tank at my Thurston County home?

Not if it's a single tank of 500 gallons or less, or multiple tanks with a combined water capacity of 500 gallons or less, serving a dwelling built under the International Residential Code and its accessory structures. Larger systems, and any non-residential installation, need an operational permit under Fire Code § [A] 105.6.27 before the LP-gas system goes in.

What counts as an LP-gas system needing a permit?

Any liquid petroleum gas system installation that exceeds the residential exemption threshold, including tanks serving commercial, industrial, or larger residential setups. Fire Code § [A] 105.6.27, adopted at TCC 14.32.030, requires an operational permit before that installation begins, enforced by the Community Planning and Economic Development Department's fire prevention division.

What happens if I install LP-gas equipment before getting the permit?

You're charged a fee equal to twice the applicable permit and plan review fees once discovered, under § [A] 113.3 (TCC 14.32.060). Continuing to operate in violation of the fire code is also a misdemeanor under § [A] 109.3, punishable by up to $1,000 in fines, up to 90 days in jail, or both.

Sources & Official References

[1]Thurston County Code, Chapter 14.32 Fire Code (Municode)

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