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St. Clair County, IL Noise Ordinances: Quiet Hours (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

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.

Key Facts

County clock curfew
None (nuisance-based)
State nighttime window
10:00 p.m. to 7:00 a.m.
Backstop statute
720 ILCS 5/26-1(a)(1)
Numeric backstop
35 Ill. Adm. Code 901
City rules control
Belleville, O'Fallon, etc.

Summary

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.

These county ordinances apply to unincorporated areas of St. Clair County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

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.

View official code

Full Breakdown

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.

Violations & Fines

Disorderly conduct under 720 ILCS 5/26-1(a)(1) is a Class C misdemeanor. Zoning nuisance violations draw county citations and abatement orders.

Frequently Asked Questions

Does the county have set quiet hours?
No. Unincorporated St. Clair County uses nuisance and disorderly-conduct enforcement, not a fixed clock curfew. Your city may set specific evening quiet hours.
What counts as nighttime for state noise limits?
The Illinois Pollution Control Board defines nighttime as the 8 hours between 10:00 p.m. and 7:00 a.m., when its lower octave-band limits apply.

Sources & Official References

Other rules in St. Clair County

Construction HoursSome RestrictionsFence Regulations: Height LimitsSome RestrictionsAmplified Music & Outdoor SoundSome RestrictionsAircraft NoiseSome RestrictionsVehicle NoiseSome RestrictionsDecibel LimitsSome RestrictionsParking Rules: Driveway RulesSome RestrictionsFence Regulations: Material RestrictionsSignificant RestrictionsFence Regulations: Retaining WallsSome RestrictionsFence Regulations: Fence Permit RequirementsSome RestrictionsFire Regulations: Smoke DetectorsSome Restrictions

All St. Clair County rules

How St. Clair County compares: Cities with the Strictest Noise Ordinances·Compare St. Clair County to another location·View the Illinois noise ordinances overview

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