Noise Ordinances in O'Fallon, MO (2026)
7 verified noise ordinances for O'Fallon, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
Quiet Hours
O'Fallon Code § 215-237(L) sets a lower nighttime noise ceiling for residential areas: 55 dB from 7:00 a.m. to 10:30 p.m., dropping to 50 dB from 10:30 p.m. to 7:00 a.m. The same clock governs the ordinance's ban on prolonged yelling or shouting on public streets under Subsection (G)(3). Measurements are taken at the front building line of the property receiving the sound, and a violation can draw a fine of up to $500.00.
O'Fallon's 10:30 P.M.-7 A.M. Noise Curfew
Some RestrictionsO'Fallon Code § 215-237(L)
L. In addition to the subjective standards established above, it shall be presumed that the allowable noise level limits have been violated whenever any noise or sound is projected from one property in the City onto another if such sound, measured at the front building line on the property receiving the sound, exceeds the following decibel standards at a location appropriate to determine the le...
Construction Hours
O'Fallon Code Section 500.420 restricts construction work to set daily windows that shift with the season, running earlier and later in summer than in winter. Work outside those hours needs written sign-off from the City Administrator or City Engineer before it starts, giving neighbors a predictable, code-backed limit on early-morning and late-night job site noise.
O'Fallon Sets Fixed Construction Work Hours
Some RestrictionsO'Fallon Code § 500.420
Construction work shall only be allowed during the following hours: October 1 – May 31 7:00 A.M. to 7:00 P.M. June 1 – September 30 6:00 A.M. to 8:00 P.M. Monday – Friday 7:00 A.M. to 8:00 P.M. Saturday and Sunday. Construction work to be done outside of these hours requires prior written approval from the City Administrator or City Engineer.
Barking Dogs
O'Fallon's noise ordinance singles out barking dogs and other noisy animals as a violation when the sound is frequent or long-continued and disturbs a neighbor's comfort or repose. The keeping of such an animal on residential premises is one of the enumerated disturbing-noise offenses under City Code § 215.237.
O'Fallon Bars Persistent Animal Noise
Some RestrictionsO'Fallon Code § 215.237(G)(4)
Animals, Birds, Etc. The keeping of any animal or bird on residential premises that causes frequent or long continued noise which disturbs the comfort or repose of any persons in the vicinity.
Amplified Music & Outdoor Sound
In O'Fallon's parks and declared festival districts, amplified music and sound equipment cannot exceed 75 decibels measured 15 feet from the source without a written permit from the Parks Director, under City Code § 225.070(7)(a). Citywide, loudspeakers used for commercial advertising are separately restricted under § 215.237(G)(2).
O'Fallon Park Amplified Sound 75 dB Cap
Some RestrictionsO'Fallon Code § 225.070(7)(a)
Musical Instruments, Sound Equipment. No person shall operate or play any musical instrument, radio, mechanical or electronic audio or video device, loudspeaker, public address system or sound-amplifying equipment of any kind within the boundaries of any City park or declared festival district in such a manner as to cause the sound emanating therefrom to exceed a loudness of seventy-five (75) d...
Aircraft Noise
O'Fallon's noise ordinance does not regulate aircraft: § 215.237(M)(7) expressly exempts 'all noises coming from the normal and legal operations of properly equipped aircraft' from the chapter's decibel limits and disturbance standards.
O'Fallon Exempts Lawful Aircraft Noise
Few RestrictionsO'Fallon Code § 215.237(M)(7)
All noises coming from the normal and legal operations of properly equipped aircraft.
Decibel Limits
O'Fallon sets objective decibel ceilings by zoning district and time of day: 55/50 dB in residential zones, 65/60 dB in commercial zones, and 70/65 dB in industrial zones, measured at the receiving property's front building line under City Code § 215.237(L).
O'Fallon's Zone-Based Decibel Noise Limits
Some RestrictionsO'Fallon Code § 215.237(L)
Objective Noise Standards—Allowable Levels In residentially zoned districts: 7:00 A.M. to 10:30 P.M. 55 dB 10:30 P.M. to 7:00 A.M. 50 dB In commercially zoned districts: 7:00 A.M. to Midnight 65 dB Midnight to 7:00 A.M. 60 dB In industrially zoned districts: 7:00 A.M. to Midnight 70 dB Midnight to 7:00 A.M. 65 dB
Vehicle Noise
O'Fallon requires every vehicle's exhaust to run through a properly attached muffler sized to quiet the exhaust as completely as a modern gas engine, and bans muffler cutouts entirely. Horns and signaling devices may only be used as warnings, never to make unnecessary noise.
O'Fallon Bans Muffler Cutouts, Excess Noise
Some RestrictionsO'Fallon Code § 370.140(B)
Muffler Cutouts. Muffler cutouts shall not be used and no vehicle shall be driven in such manner or condition that excessive and unnecessary noises shall be made by its machinery, motor, signaling device, or other parts, or by any improperly loaded cargo. The motors of all motor vehicles shall be fitted with properly attached mufflers of such capacity or construction as to quiet the maximum pos...
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