Noise Ordinances in St. Clair County, IL (2026)
6 rules for unincorporated St. Clair County, Illinois.
Verified from official government sources
Quiet Hours
Unincorporated St. Clair County sets no fixed clock quiet hours. Nighttime noise is handled through the county nuisance/zoning code and Illinois disorderly-conduct law. Belleville, O'Fallon and other cities set their own night rules, so check your municipality.
Quiet Hours in St. Clair County, Illinois
Some Restrictions35 Ill. Adm. Code 901.105
Nighttime hours means the 8 hours between 10:00 p.m. and 7:00 a.m. that are not part of the 16 continuous daytime hours.
Construction Hours
Unincorporated St. Clair County's Zoning Ordinance sets no specific construction-hour window; loud work is limited only as a nuisance beyond the property line. Cities such as Belleville and O'Fallon set their own construction-hour limits, so verify with your municipality.
Construction Noise Hours in St. Clair County, Illinois
Some RestrictionsSt. Clair County Zoning Ordinance Sec. 40-8-2
No use of land, building or structure shall be permitted which creates a nuisance or detrimental or hazardous condition.
Amplified Music & Outdoor Sound
Unincorporated St. Clair County has no dedicated outdoor-music ordinance. Live or amplified outdoor sound is handled through the county nuisance code and Illinois disorderly-conduct law. Cities often require event permits and set sound limits.
Outdoor Music Rules in St. Clair County, Illinois
Some RestrictionsSt. Clair County Zoning Ordinance Sec. 40-2-2
Creation or maintenance of any unreasonably distracting or objectionable vibration and/or electrical disturbances discernible at or beyond the property line of the premises on which the aforesaid vibration or electrical disturbance is created or maintained.
Aircraft Noise
New or redeveloped buildings in the Airport Overlay AO-4 Noise Zones Area, the airfield noise footprint around Scott Air Force Base and MidAmerica St. Louis Airport, fall into one of four noise zones under Zoning Code Sec. 40-4-128(C): NZ-1 (65-69 dB day-night level), NZ-2 (70-74 dB), NZ-3 (75-79 dB) and NZ-4 (over 80 dB, federal land only). Each zone carries its own attenuation and land-use limits.
Aircraft Noise Zone Rules in St. Clair County, IL
Some RestrictionsSt. Clair County Zoning Code Sec. 40-4-128(C)
40-4-128 PURPOSE AND GENERALLY. (A) The purpose of this section is to require that new or redeveloped buildings within the Noise Zones Area, Airport Overlay (AO-4) District, be constructed with materials and in such manner that aircraft noise is reduced by the structure to an interior level which has no adverse impact on the health, safety, and general welfare of the residents. ... (C) Establis...
Decibel Limits
St. Clair County sets no local decibel ordinance. Measurable noise is judged against the Illinois Pollution Control Board's octave-band sound limits (35 Ill. Adm. Code 901), which are lower at night between 10:00 p.m. and 7:00 a.m.
Noise Decibel Limits in St. Clair County, Illinois
Some Restrictions35 Ill. Adm. Code 901.102(b)
No person shall cause or allow the emission of sound during nighttime hours from any property-line noise source located on any Class A, B or C land to any receiving Class A land that exceeds any allowable octave band sound pressure level specified in the following table.
Vehicle Noise
Illinois law requires every vehicle to have a working muffler that prevents excessive or unusual noise and bans exhaust cutouts and loud modifications, enforced statewide including throughout St. Clair County by the sheriff and local police.
Vehicle Noise Rules in St. Clair County, Illinois
Some Restrictions625 ILCS 5/12-602
Every motor vehicle driven or operated upon the highways of this State shall at all times be equipped with an adequate muffler or exhaust system in constant operation and properly maintained to prevent any excessive or unusual noise.
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