Chicago, IL Noise from Specific Sources: Generator Noise (2026)
Key Facts
- Daytime/nighttime limit
- 55 dB(A) at 100 ft
- Close-range limit
- 70 dB(A) at 10 ft
- Restricted hours
- 8:00 p.m.–8:00 a.m.
- Emergency power use
- Exempt from dB limits
- Fine range
- $1,000–$5,000 per offense
Summary
Chicago caps generator noise at 55 dB(A) from 100 feet, but exempts emergency backup power use entirely.
No person shall operate or permit operation of any mechanical stationary equipment in such a manner as to generate sound having a sound pressure level greater than 55 dB(A) when measured from a distance of 100 feet or more... The limits set in subsection (a) of this section do not apply to sounds generated by a generator used during a loss of normal power supply to provide emergency electrical power.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-74: Current through Council Journal of June 17, 2026).
Full Breakdown
Chicago's noise ordinance treats a generator as "mechanical stationary equipment," and Section 8-32-090 caps the sound it can make at 55 dB(A) measured 100 feet away, or 70 dB(A) at 10 feet, measured from off the property where the generator sits. The cap runs nightly from 8:00 p.m. to 8:00 a.m. unless the Department of the Environment issued written authorization for different hours. Crucially, subsection (f) carves out any generator running because normal power has failed and it's supplying emergency electrical power, that use is exempt from the dB limits altogether. The Chief Sustainability Officer enforces the section and can adopt mitigation rules.
Violations & Fines
Fines of $1,000 to $5,000 per offense; each day of violation counts as a separate offense, and co-owners/operators of the same equipment are jointly and severally liable.
Frequently Asked Questions
Can I run a backup generator during a power outage without violating the noise limit?
How is generator noise measured for enforcement?
Sources & Official References
Other rules in Chicago
Compare Chicago to another location·View the Illinois noise from specific sources overview
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Generator Noise in Nearby Cities
How other cities in Cook County handle generator noise.