Vehicle Idling Restrictions: Redmond vs Seattle
How do vehicle idling restrictions rules compare between Redmond, WA and Seattle, WA?
Redmond and Seattle have similar restriction levels.
Redmond, WA
King County
King County and Washington state limit unnecessary diesel idling, particularly near schools, hospitals, and Metro bus bases, to protect air quality in the central Puget Sound airshed.
View full Redmond rules →Seattle, WA
King County
Washington RCW 70A.15 and Puget Sound Clean Air Agency Reg I limit commercial vehicle idling, while Seattle SMC Title 22 noise rules effectively cap residential engine idling. Diesel trucks face a five-minute idle limit in most cases.
View full Seattle rules →Key Facts Comparison
| Fact | Redmond | Seattle |
|---|---|---|
| Default limit | Five minutes diesel idling | - |
| Enforcer | Puget Sound Clean Air Agency | - |
| Focus areas | Schools, hospitals, transit | - |
| Exceptions | Loading, defrost, safety | - |
| State law | - | RCW 70A.15 |
| PSCAA limit | - | 5 minutes |
| Penalty | - | Up to $1,000/day |
| Exempt | - | EVs, hybrids |
Highlighted rows indicate differences between cities.
Redmond FAQ
Does this apply to passenger cars?
State idling rules focus on diesel commercial vehicles, but local school districts often post no-idling signs that apply to all parents and visitors.
How do I report idling trucks?
Contact the Puget Sound Clean Air Agency complaint line, which handles idling and other air pollution reports across King, Pierce, Snohomish, and Kitsap counties.
Seattle FAQ
Does Seattle ban personal car idling?
No outright ban, but sustained idling that creates noise or fumes can trigger SMC 25.08 noise complaints or nuisance enforcement, especially in residential zones.
How do I report an idling truck?
File a complaint with the Puget Sound Clean Air Agency at pscleanair.gov or call 1-800-552-3565 with location, time, and license plate.
Compare other topics
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