Spokane County, WA Noise Ordinances: Vehicle Noise (2026)
Key Facts
- Governing rule
- WAC 173-62 (state)
- Car limit (<=45 mph)
- 72 dBA at 50 ft
- Motorcycle (<=45 mph)
- 78 dBA at 50 ft
- Heavy truck (<=35 mph)
- 86 dBA at 50 ft
- County code
- Exempts WAC-173-62 vehicles
Summary
Motor-vehicle noise in Spokane County is governed by statewide standards in WAC 173-62, not the county noise ordinance (SCC 6.12 exempts vehicles regulated by WAC 173-62). Cars under 10,000 lbs are capped at 72 dBA at 35 mph or less, measured at 50 feet.
Automobiles, light trucks and all other motor vehicles 10,000 pounds (4536 kg) GVWR or less: 45 mph (72 kph) or less - 72 dBA; over 45 mph (72 kph) - 78 dBA. Motorcycles: 45 mph (72 kph) or less - 78 dBA; over 45 mph (72 kph) - 82 dBA.
Full Breakdown
SCC 6.12 expressly exempts sounds created by motor vehicles when regulated by WAC Chapter 173-62. Under WAC 173-62-030, in-use vehicle noise measured at 50 feet may not exceed: 72 dBA for autos and light vehicles (10,000 lbs GVWR or less) at 45 mph or less; 78 dBA over 45 mph; and 78 dBA for motorcycles at 45 mph or less, 82 dBA above. Heavy trucks over 10,000 lbs are capped at 86 dBA at 35 mph or less. Modified exhaust and loud stereos audible far away can be enforced.
Violations & Fines
Excessive vehicle noise and illegal/modified exhaust are enforced by the Sheriff and State Patrol under WAC 173-62 and RCW 46.37 (muffler/exhaust). Traffic infractions with fines apply.
Frequently Asked Questions
Are loud exhausts illegal in Spokane County?
Does the county noise ordinance cover cars?
Sources & Official References
Other rules in Spokane County
Compare Spokane County to another location·View the Washington noise ordinances overview
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