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.
Neither the county Zoning Ordinance nor county nuisance code lists numeric dBA thresholds. Instead, Illinois applies statewide octave-band sound-pressure limits set by the Illinois Pollution Control Board under 35 Ill. Adm. Code 900-901. Those limits vary by land class (residential land is Class A) and are stricter during nighttime hours. Enforcement of the state limits runs through the Illinois EPA and Pollution Control Board rather than the county. For everyday disturbances the county relies on its nuisance provisions and 720 ILCS 5/26-1 disorderly conduct rather than a meter reading. Cities may adopt their own decibel ordinances.
Exceedances of IPCB limits are enforced by the Illinois EPA/Pollution Control Board with cease-and-desist orders and civil penalties, not county fines.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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