Spokane County applies Washington's WAC 173-60 environmental noise limits. Sound crossing into a residence (Class A EDNA) may not exceed 55 dBA during the day, dropping to 45 dBA between 10 p.m. and 7 a.m. Higher limits apply to commercial (57-60) and industrial (60-70) receiving property.
WAC 173-60-040 sets maximum permissible noise levels by the environmental designation (EDNA) of both the source and receiving property. For residential (Class A) receiving property: 55 dBA from a residential source, 57 dBA from commercial, and 60 dBA from industrial sources. Between 10:00 p.m. and 7:00 a.m. these residential-receiving limits drop 10 dBA. Short exceedances are allowed: 5 dBA for 15 minutes, 10 dBA for 5 minutes, or 15 dBA for 1.5 minutes in any hour.
Exceeding WAC 173-60 limits is a noise nuisance enforceable by the county and the Department of Ecology. Complaints route through Crime Check (509) 456-2233 and county code enforcement.
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