Peoria, IL Noise Ordinances: Decibel Limits (2026)

The table applies to every use established in an industrial district after the Development Code's effective date and is enforced as part of the building and occupancy permit process under Section 4.5.7.B, which requires a state-licensed professional engineer to certify that a proposed industrial building complies with these performance standards before a permit issues. The limits are broken out by octave band center frequency, from 31.5 Hz through 8,000 Hz, and by four receiving-use categories: a residential district receiving noise from an industrial district during daytime hours (72 dB at 31.5 Hz), the same residential receiving district at night (a stricter 63 dB), a business or commercial district receiving industrial noise (up to 79 dB), and one industrial lot receiving noise from a neighboring industrial lot (up to 80 dB, the most permissive category).

Measurements for the residential-daytime and residential-nighttime columns must be taken at least 25 feet from the noise source. Separate provisions in the same section, Sections 4.5.7.C.1.d and .e, set additional limits on impulsive sound and prohibit prominent discrete tones that stand out from the ambient octave band level. Test procedures must substantially conform to American National Standards Institute practices, including ANSI S1.1-1960 and the other ANSI standards named directly in the code, giving both the city and an applicant's engineer a fixed, repeatable measurement protocol rather than a subjective nuisance standard.