Maricopa, AZ Noise Ordinances: Vehicle Noise (2026)

Vehicle noise in Maricopa is governed by both city and state law. MCC 18.110.050(B)(3) prohibits using any automobile, motorcycle or other vehicle, engine or motor 'in such a manner as to create loud and unnecessary grating, grinding, rattling, or other noise.' The same ordinance requires operating any gasoline (or other) mechanical device only with a muffler in good working order and in constant operation to prevent excessive or unusual noise, and expressly bars use of any muffler cutout, bypass or similar device. The general public-peace ordinance MCC 9.20.010 also reaches motor-vehicle repair: within any residential area of the city it is unlawful to repair, rebuild or test any motor vehicle between 8:00 p.m. and 5:00 a.m. in a manner that causes a reasonable resident discomfort or annoyance. At the state level, A.R.S. 28-955 requires every motor vehicle to be equipped with a muffler in good working order to prevent excessive or unusual noise and prohibits muffler cutouts, bypasses and similar devices. Together these rules target loud exhaust, revving and after-hours vehicle work.