St. Louis's Noise Ordinances: The Rules That Matter

Every city handles noise ordinances a little differently. In St. Louis, Missouri, there are 7 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Decibel Limits

St. Louis caps stationary noise sources by zoning district and time of day, from 55 dB(A) daytime near "A" through "E" residential zones up to 80 dB(A) at all hours in "J" and "K" industrial districts.

Key details: Residential (A-E): 55 dB(A) day / 50 dB(A) night. Commercial (F-G): 65 dB(A) day / 60 dB(A) night. Commercial-industrial (H-I): 70 dB(A) all hours. Industrial/unrestricted (J-K): 80 dB(A) all hours. Penalty: $100-$500 fine or 90 days jail.

Violating the noise limits carries a fine of $100 to $500, up to 90 days imprisonment, or both; each day of continued violation is a separate offense, and unabated violations go to the City Counselor for prosecution.

Vehicle Noise

Vehicle noise in St. Louis is regulated under SLRC Chapter 17 and state RSMo 307.170. Modified exhaust, loud stereos, and engine revving are prohibited. SLMPD Traffic Division actively enforces on Kingshighway, Gravois, and downtown.

Key details: Muffler: Required - RSMo 307.170. Code: SLRC 17.70. Stereo: 50 ft audibility limit. Fine: $100-$500. Impound: Possible for takeovers.

$100 first offense, up to $500 for repeat. Vehicle impoundment possible for modified exhaust or street-takeover participation.

Construction Hours

St. Louis bars construction, demolition and excavation noise within 1,000 feet of homes before 6 a.m. and after dusk, Monday through Saturday, with only a 3-day emergency exception.

Key details: Permitted hours: 6:00 a.m. to dusk, Mon-Sat. Regulated zone: Within 1,000 feet of homes. Emergency exception: Max 3 days without permit. Permit issuer: Building Commissioner. First offense fine: $100 to $500.

Violating Section 15.50.081 draws a fine of $100-$500 for a first offense and $250-$500 for repeat offenses within a year, or community service in lieu, under Section 15.50.082.

Leaf Blower Rules

St. Louis exempts lawn care equipment, including leaf blowers and mowers, from its citywide noise limits only from 7 a.m. to sunset; use outside those hours loses the exemption and must meet the ordinary decibel standards.

Key details: Exempt hours: 7:00 a.m. to sunset. Outside those hours: exemption does not apply. Governing section: § 15.51.040(I). Fine range: $100–$500 per violation. Enforced by: Health Commissioner.

Fines of $100 to $500 per offense under § 15.51.090, plus possible imprisonment up to 90 days; each day a violation continues after a Health Commissioner notice is a separate offense.

Barking Dogs

St. Louis bans keeping any animal, bird, or fowl whose frequent noise disturbs neighbors' comfort and repose, with a 100-foot audibility threshold defining excessive noise.

Key details: Trigger distance: audible past 100 feet. Covers: any animal, bird, or fowl. Standard: frequent or long-continued noise. Penalty: $1–$500 fine and/or 90 days.

No specific penalty is set for this section, so the Code's general penalty under § 1.12.010 applies: a fine of $1 to $500, up to 90 days imprisonment, or both, with each day of continued violation a separate offense.

Quiet Hours

St. Louis defines nighttime hours as 10 p.m. to 7 a.m. and requires stationary noise sources in residential Districts A through E to stay at or below 50 dB(A) sustained then, five decibels under the daytime cap.

Key details: Nighttime hours: 10:00 p.m.–7:00 a.m.. Nighttime limit, Districts A–E: 50 dB(A) sustained. Daytime limit, Districts A–E: 55 dB(A) sustained. Enforcing official: Health Commissioner. Penalty: $100–$500 fine, up to 90 days jail.

Health Commissioner issues a written notice to abate; unresolved violations go to the City Counselor for prosecution. Fines run $100–$500 (or up to 90 days in jail), with each day of continued violation a separate offense; the City can also seek a court injunction.

Amplified Music & Outdoor Sound

St. Louis caps amplified sound on public property at audible beyond 75 feet and bars private-property playback louder than needed for on-site listeners.

Key details: Public property limit: audible beyond 75 feet. Private property standard: louder than necessary for listeners present. First offense fine: at least $100. Repeat offense (3rd+): at least $500. Community service option: 20-60 hours in lieu of fine.

Fine starts at $100 (first offense), $250 (second), $500 (third+) within a year; court may impose 20-60 hours community service instead.

The Bottom Line

St. Louis's noise ordinances rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming St. Louis is broadly strict or permissive.

All of the above reflects St. Louis's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.