Bolingbrook, IL Noise Ordinances: Decibel Limits (2026)

Sec. 54-144(1) governs noise from any use established on industrially zoned or industrially used property. m. 5 cycles per second down to 35 dB at 8,000 cycles per second; Level B runs several decibels higher at each band. Table 54-144-2 gives a simpler A-weighted screening standard: 50 dB(a) for Level A, 55 dB(a) for Level B. Table 54-144-3 assigns which level applies by district and boundary type: I-1 uses Level A at every boundary (adjacent lot line, commercial boundary, and residential boundary), while I-2 uses the louder Level B at the adjacent lot line and commercial boundary but drops to Level A at any residential district boundary.

value on the sound level meter. Instruments used to measure compliance must conform to current American National Standards Institute specifications. This performance standard is a land-use compatibility rule between industrial operations and their neighbors; it does not create a general nighttime quiet-hours ordinance for residential or commercial noise complaints such as loud parties or barking dogs, which fall under separate nuisance provisions.