Kent County sets no countywide decibel limit; your city or township does. Grand Rapids uses octave-band and A-weighted sound-pressure limits along zoning-district boundaries, with nighttime (10 p.m.-7 a.m.) limits 7 dB lower than daytime steady-noise limits.
Grand Rapids Noise Control Ordinance Sec. 9.63(11) sets maximum sound-pressure levels in decibels for each octave-band center frequency measured at district boundaries. For monitoring it allows A-scale values of 55 dB(A) for residential and 62 dB(A) for business-commercial districts (slow response), and specifies that nighttime levels (10:00 p.m. to 7:00 a.m.) be 7 dB lower than the daytime steady-noise figures. Heavy-industrial districts use a higher table under Sec. 9.63(12). These numeric limits are Grand Rapids' own; other Kent County municipalities may use nuisance-based standards instead, so verify locally.
Exceeding the Grand Rapids limits is a Chapter 151 municipal civil infraction; the ordinance states any level above the 55/62 dB(A) monitoring values constitutes a violation. Fines are set by the city. Other jurisdictions enforce their own standards.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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