Washtenaw County sets no decibel limits. Ann Arbor caps property-line noise at 61 dB(A) daytime and 55 dB(A) overnight for residential areas, and 71/61 dB(A) for commercial areas.
Decibel limits are set by each Washtenaw city or township, not the county. Ann Arbor Chapter 119, Section 9:364, prohibits any activity that produces a dB(A) beyond the property line exceeding Table I: residential property receiving the sound is limited to 61 dB(A) from 7:00 a.m. to 10:00 p.m. and 55 dB(A) from 10:00 p.m. to 7:00 a.m.; commercial property is limited to 71 dB(A) daytime and 61 dB(A) overnight. The limit is judged by the use of the property receiving the sound. Ypsilanti and townships use their own standards, often a plainly-audible test rather than a meter.
Civil infraction: $50-$500 plus costs, escalating to $100 (second) and $200 (third) within two years; up to 240 hours community service.
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