Quiet hours in St. Clair County, IL — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
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.
Illinois counties zone unincorporated land under 55 ILCS 5/5-12001, but St. Clair County's Zoning Ordinance regulates noise as a nuisance rather than by a numeric curfew. Outside the cities, a loud late-night disturbance is enforced under 720 ILCS 5/26-1(a)(1) disorderly conduct and, for measurable sources, the Illinois Pollution Control Board's lower nighttime limits (35 Ill. Adm. Code 901). If you live inside Belleville, O'Fallon, Fairview Heights or East St. Louis, the city ordinance controls and typically defines evening quiet hours. Contact the St. Clair County Building & Zoning Department in Belleville for the unincorporated rule.
Disorderly conduct under 720 ILCS 5/26-1(a)(1) is a Class C misdemeanor. Zoning nuisance violations draw county citations and abatement orders.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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