Industrial-source noise received on residential property in unincorporated Snohomish County is capped at 60 dB(A) daytime (SCC 10.01.030(2)), dropping 10 dB(A) at night. Washington's WAC 173-60-040 mirrors this: Class C source into Class A residential receiving is limited to 60 dBA, minus 10 dBA nighttime.
SCC 10.01.030(2) sets a 60 dB(A) daytime limit for industrial-source noise received on residential property (65 dB(A) for commercial receiving, 70 dB(A) for industrial receiving). The state standard, WAC 173-60-040, provides identical numbers by EDNA class: Class C (industrial) source into Class A (residential) receiving is 60 dBA, into Class B is 65, into Class C is 70. Both cut the residential/Class A limit by 10 dBA between 10:00 p.m. and 7:00 a.m. New commercial and industrial builders are advised of the ordinance and urged to design in noise abatement (SCC 10.01.070).
County civil infractions carry a $100/$250 penalty, doubled for repeats within three years. The state Noise Control Act (Chapter 70.107 RCW) and Department of Ecology also enforce WAC 173-60 limits.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
Snohomish County, WA
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See how Snohomish County's industrial noise rules stack up against other locations.
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