10 county-level rules, plus city-specific rules for 1 city in Washtenaw County, Michigan.
Verified from official government sources
Washtenaw County has no countywide noise ordinance; hours are set by each city or township. In Ann Arbor, quiet hours run 10:00 p.m. to 7:00 a.m., and any unreasonably loud noise is prohibited at all times.
Ann Arbor Code § 9:362
It shall be unlawful for any person to create, assist in creating, permit, continue or permit the continuance of any unreasonably loud, disturbing, unusual or unnecessary noise which annoys, disturbs, injures, or endangers the comfort, repose, health, peace or safety of others within the limits of the City of Ann Arbor.
The county sets no construction-hour rule. In Ann Arbor, construction, demolition, drilling and excavation are prohibited at any time on Sundays and legal holidays, and between 8:00 p.m. and 7:00 a.m. Monday through Saturday.
Ann Arbor Code § 9:363(5)
Construction, repair, remodeling, demolition, drilling or excavation work at any time on Sunday or a legal holiday and between 8:00 p.m. and 7:00 a.m. Monday-Saturday, except as permitted by section 9:365(2).
There is no countywide barking-dog ordinance. Washtenaw County Animal Control (contracted to the Humane Society of Huron Valley) handles animal complaints, while Ann Arbor treats a barking-dog noise nuisance between 10:00 p.m. and 7:00 a.m. as a Chapter 119 violation.
Ann Arbor Code § 9:363(9)
A noise nuisance as defined in Chapter 107 (Animals) after 10:00 p.m. and before 7:00 a.m.
The county sets no leaf-blower rule. Ann Arbor bans gas-powered leaf blowers from June 1 to September 30 (effective 2024), and prohibits power equipment between 10:00 p.m. and 7:00 a.m. Daytime power equipment must stay under 90 dB(A) at the property line.
Ann Arbor Code § 9:365(1)
Operation, between 7:00 a.m. and 10:00 p.m., of power equipment that does not produce a sound level exceeding 90 dB(A) beyond the property line of the property on which the equipment is operated.
The county sets no amplified-sound rule. Ann Arbor prohibits operating any loudspeaker, sound amplifier or PA system between 10:00 p.m. and 7:00 a.m. Non-commercial amplified speech is allowed 7:00 a.m.-10:00 p.m.
Ann Arbor Code § 9:363(6)
The operation or use between 10:00 p.m. and 7:00 a.m. of any loudspeaker, sound amplifier, public address system or similar device used to amplify sounds.
Neither Washtenaw County nor its cities regulate aircraft noise. Ann Arbor's noise ordinance expressly excludes aircraft in flight or operating at an airport, and aircraft noise is governed by the FAA under federal law.
Ann Arbor Code § 9:360
The provisions of Article I apply to all sources of sound except: (1) Motor vehicles ... in operation on a public right-of-way; (2) Aircraft in flight or in operation at an airport; (3) Railroad equipment in operation on railroad rights-of-way.
Washtenaw County does not zone or set industrial-noise limits; cities and townships do. Ann Arbor caps noise received at commercial (non-residential) property at 71 dB(A) daytime and 61 dB(A) overnight, with no separate industrial tier.
Ann Arbor Code § 9:364
No person shall conduct or permit any activity that produces a dB(A) beyond his property line exceeding the levels specified in Table I. [Commercial 71 (7 a.m.-10 p.m.) / 61 (10 p.m.-7 a.m.). All limits expressed in dB(A).]
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.
Ann Arbor Code § 9:364
No person shall conduct or permit any activity that produces a dB(A) beyond his property line exceeding the levels specified in Table I. [Residential 61 (7 a.m.-10 p.m.) / 55 (10 p.m.-7 a.m.); Commercial 71 / 61. All limits expressed in dB(A).]
The county sets no outdoor-music rule. Ann Arbor bans playing any radio, TV, phonograph, drum or musical instrument between 10:00 p.m. and 7:00 a.m. if audible past your property line, and caps a single acoustic instrument at 67 dB(A) by day.
Ann Arbor Code § 9:363(4)
The operation or playing between 10:00 p.m. and 7:00 a.m. of any radio, television, phonograph, drum or musical instrument.
The county sets no vehicle-noise rule of its own. Ann Arbor prohibits any car stereo clearly audible more than 50 feet from the vehicle, and requires a working muffler with no cutouts or bypasses.
Ann Arbor Code § 9:390
No person operating or in control of a parked or moving motor vehicle (including motorcycles and mopeds) shall operate, or permit the operation of, an electronically amplified sound system in or on the vehicle so as to produce sound that is clearly audible more than 50 feet from the vehicle.
1 cities in Washtenaw County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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