Fire Regulations in Walla Walla County, WA (2026)
7 rules for unincorporated Walla Walla County, Washington.
Verified from official government sources
Fire Pits & Backyard Fires
Permanent outdoor fireplaces and barbecues built as part of a new structure inside the Mill Creek Wildfire Protection Area of unincorporated Walla Walla County must carry a screen over the outlet and keep a five-foot clearance of bark, mulch and other flammable material around the unit. Trees and vegetation also must stay fifteen feet back from the stovepipe or heat-producing vent outlet.
Outdoor Fireplace Rules, Walla Walla County
Some RestrictionsWalla Walla County Code § 15.04.520(E)
E.Permanent outdoor fireplaces and barbeques shall be equipped with a screen over the outlet. No portion of a tree or other vegetation may extend to within fifteen feet of the outlet of the stovepipe/heat producing vent/chimney. An area of five feet around permanent outdoor fireplaces and barbecues shall be cleared of flammable material including bark and mulch.
Fireworks
In unincorporated Walla Walla County, only a permitted fireworks sale stand may sell fireworks, and discharge is legal only during two narrow windows around July 4th and New Year's, each with its own set hours under the adopted International Fire Code.
Fireworks Rules in Walla Walla County
Significant RestrictionsWalla Walla County Code § 15.04.140(C)
Every applicant for a fireworks sale stand shall first obtain a permit and pay the fee established in Chapter 3.08. Fireworks may be offered for sale by permittees, and may be discharged only between the hours of nine a.m. and eleven p.m. on July 1st, 2nd and 3rd, between the hours of nine a.m. on July 4th and twelve a.m. on July 5th. Fireworks may be offered for sale by permittees between the ...
Brush Clearance
New structures built inside the Mill Creek Wildfire Protection Area of unincorporated Walla Walla County must keep a thirty-foot fire break clear around the entire building and hold trees and other vegetation back at least fifteen feet from any chimney, heat-producing vent or stovepipe outlet. The county building official can waive or reduce the fire break only, not the vegetation setback, if it proves impractical.
Brush Clearance Rules, Walla Walla County
Some RestrictionsWalla Walla County Code § 15.04.520(C)-(D)
C.A fire break of not less than thirty feet shall be created around all new structures. This requirement may be waived or reduced by the building official if deemed impractical.D.No portion of a tree or any other vegetation shall extend to within fifteen feet of the outlet of a chimney, heat producing vent or stovepipe.
Outdoor Burning
Unincorporated Walla Walla County bans burning garbage, treated wood, plastics, tires and other listed materials outright, and limits legal residential yard-debris burns to permit holders using piles no bigger than four feet across and three feet high, kept 500 feet from forest slash, under Code §§ 15.04.141-143.
Outdoor Burning Rules in Walla Walla County
Significant RestrictionsWalla Walla County Code §§ 15.04.141, 15.04.142, 15.04.143
None of the following materials shall be burned: garbage, dead animals, asphalt, petroleum products, paints, rubber products, plastics, treated wood, paper products, cardboard, metal, construction debris, demolition debris, rubbish, or any substances which emit dense smoke or obnoxious odors. ... 2.A responsible person at least eighteen years of age must be present to monitor and control the fi...
Wildfire Zones
New structures built within the Mill Creek Wildfire Protection Area of unincorporated Walla Walla County must use non-combustible, fire-resistant or fire-retardant roofing and exterior materials, and every chimney or vent connected to a fuel-burning device needs a spark-arresting screen. The area was defined by the 2006 Mill Creek Community Wildfire Protection Plan under County Resolution 06-069. Re-roofing and re-siding of existing homes must meet the material standard too.
Mill Creek Wildfire Rules, Walla Walla County
Some RestrictionsWalla Walla County Code §§ 15.04.510, 15.04.520(A)-(B)
"Mill Creek Wildfire Protection Area" means that area described in the 2006 Mill Creek Community Wildfire Protection Plan, adopted by Walla Walla County Resolution 06-069, that lies within the Walla Walla County Portion of the study area. ... All new structures requiring a building permit hereafter constructed within the Mill Creek Wildfire Protection Area, shall make the entire structure confo...
Smoke Detectors
Walla Walla County requires any dwelling or accessory building moved into the unincorporated area to meet current fire and life-safety standards after relocation, including smoke alarms installed and interconnected wherever technically feasible, plus egress windows, stair guardrails and fire-rated assemblies, verified by a pre-move inspection.
Smoke Alarms for Moved Dwellings, Walla Walla County
Some RestrictionsWalla Walla County Code § 15.04.060(A)
Any dwelling or accessory building proposed to be moved into Walla Walla County must be structurally sound. Structural defects must be corrected. After relocation, the dwelling must be in substantial conformance with fire and life safety requirements of the current building code. This may include, but is not limited to: 1.Smoke alarms installed and interconnected where technically feasible;2.Eg...
Propane Storage
Recreational vehicles used as a primary residence in a mobile or manufactured home park in unincorporated Walla Walla County cannot add an external propane tank unless the RV's onboard tank is disabled and the external tank carries a pressure valve matched to the onboard tank's rating. External tanks must stay clear of pathways and parking pads and be secured to the ground.
RV Propane Tank Rules, Walla Walla County
Some RestrictionsWalla Walla County Code § 15.08.075(E)-(F)
Recreational vehicles may not be used as a primary and/or permanent residence unless located in a mobile/manufactured home park. ... E.No external propane tanks will permitted unless the onboard propane tank is disabled and the external tank is fitted with a pressure valve installed by a propane supplier to equal the pressure value rating of the onboard propane tank.F.External propane tanks mus...
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