Industrial Noise: Downers Grove vs Naperville
How do industrial noise rules compare between Downers Grove, IL and Naperville, IL?
Naperville has fewer restrictions than Downers Grove.
Downers Grove, IL
DuPage County
Illinois sets uniform statewide decibel limits for stationary industrial and commercial noise sources through Pollution Control Board rules under the Environmental Protection Act.
View full Downers Grove rules →Naperville, IL
DuPage County
Naperville sets specific decibel thresholds for industrial and commercial zones under Title 6, Chapter 14. Light industrial zones may not exceed 70 dBA and industrial zones may not exceed 80 dBA measured at the property line.
View full Naperville rules →Key Facts Comparison
| Fact | Downers Grove | Naperville |
|---|---|---|
| Statute | 415 ILCS 5/24 | - |
| Rules | 35 Ill. Adm. Code 900-901 | - |
| Regulator | Illinois Pollution Control Board | - |
| Max penalty | $50,000 plus $10,000/day | - |
| Land classes | Class A, B, and C | - |
| Light Industrial | - | 70 dBA maximum |
| Industrial | - | 80 dBA maximum |
| Measurement | - | At property line |
| Code | - | Title 6, Chapter 14 |
Highlighted rows indicate differences between cities.
Downers Grove FAQ
Can an Illinois municipality allow louder industrial noise than state rules?
No. The Environmental Protection Act sets a floor; cities may impose stricter local limits but cannot authorize emissions exceeding IPCB octave-band standards at residential or commercial property lines.
How do I file an industrial noise complaint in Illinois?
Submit a complaint to the Illinois EPA Bureau of Air, which investigates noise under 35 IAC 900. Citizens may also file enforcement petitions directly with the Pollution Control Board under 415 ILCS 5/31.
Naperville FAQ
What are the industrial noise limits in Naperville?
Industrial zones cannot exceed 80 dBA and light industrial zones cannot exceed 70 dBA, measured at the property line using ANSI-standard sound level meters.
Do industrial noise limits change at night?
Yes. Stricter limits apply during quiet hours from 7 PM to 7 AM. Operations near residential zones must meet the more restrictive residential limits at those boundaries.
Compare other topics
See how Downers Grove and Naperville compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool