Des Moines's Noise Ordinances: The Rules That Matter

Every city handles noise ordinances a little differently. In Des Moines, Iowa, 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.

Vehicle Noise

Des Moines caps car-stereo noise at 50 feet by day and 25 feet at night, and sets drive-by dBA limits by vehicle class and speed under Municipal Code § 42-259. Police and community development enforce citywide.

Key details: Stereo audibility (day): Not detectable beyond 50 feet. Stereo audibility (night): Not detectable beyond 25 feet, 7pm-7am. Ordinary vehicle dBA limit: 76 dBA ≤35 mph / 82 over. Heavy truck idling limit: 20 minutes max within 150 feet. Penalty: Simple misdemeanor or municipal infraction.

Violating any noise-limit or sound-system provision in article IV is a simple misdemeanor or municipal infraction, punishable by criminal or civil penalty under § 1-15 (Municipal Code § 42-268).

Leaf Blower Rules

Des Moines exempts electric power tools and motor-powered, muffler-equipped lawn and garden equipment, leaf blowers included, from its citywide noise limits only between 7 a.m. and 10 p.m. Run one outside that window and it must meet the same decibel cap as any other noise source.

Key details: Exempt hours: 7:00 a.m. to 10:00 p.m.. Outside those hours: must meet standard dBA cap. Residential night limit: 50 dBA. Enforced by: Community Development + Police. Max civil penalty: $750 first offense.

Violating the noise ordinance is a simple misdemeanor or municipal infraction under Sec. 42-268, carrying a civil penalty up to $750 per violation, or $1,000 for a repeat offense, under Municipal Code Sec. 1-15.

Amplified Music & Outdoor Sound

Des Moines requires a sound permit for amplified music or speech that creates a noise disturbance, capping most outdoor events at 85 dBC and limiting the hours and zoning districts where it's allowed.

Key details: Standard cap: 85 dBC at property line. Standard hours: 9 a.m.–10 p.m.. Permit issuer: Community development dept.. Zoning limit: Industrial/commercial/mixed-use only. Penalty: Simple misdemeanor / infraction.

Operating unpermitted sound equipment, exceeding the permit's dBC limit, or violating permit conditions is a simple misdemeanor or municipal infraction under § 42-268; a second violation within 12 months can trigger permit revocation under § 42-258(h).

Decibel Limits

Des Moines caps outdoor sound at the receiving property's boundary: 60 dBA daytime and 50 dBA nighttime in residential zones, 65 dBA in mixed-use/commercial zones and the flood district, and 75 dBA in industrial zones under Municipal Code § 42-254.

Key details: Residential daytime limit: 60 dBA, 7 a.m.–10 p.m.. Residential nighttime limit: 50 dBA, 10 p.m.–7 a.m.. Mixed-use/commercial limit: 65 dBA at all times. Industrial zone limit: 75 dBA at all times. Noise-sensitive area limit: 55 dBA at all times.

Sound above the Table 1 limits is a violation of Municipal Code § 42-254, enforced by the noise control division as a civil infraction or criminal citation.

Construction Hours

Des Moines bans construction, drilling, and demolition noise between 10 p.m. and 7 a.m. citywide, with narrow variances for utility maintenance and city-approved nonprofit housing projects working under an expedited construction schedule.

Key details: Quiet hours: 10:00 p.m. to 7:00 a.m.. Covers: construction, drilling, demolition tools. Also covers: preventive utility maintenance work. Night exception: Type "J" permit, nonprofit housing only. Penalty: simple misdemeanor or municipal infraction.

Violating the construction quiet hours is a simple misdemeanor or municipal infraction under section 1-15, punishable by criminal or civil penalty, enforced by community development and police on complaint.

Barking Dogs

Des Moines bans owning or keeping any animal or bird whose frequent, sustained sounds create a noise disturbance across a residential property line or in a noise-sensitive area.

Key details: Governing section: Municipal Code § 42-262. Standard: Frequent/continued noise disturbance. Enforcement: Complaint-driven, § 42-263. Penalty: Simple misdemeanor or municipal infraction.

Violations are enforced on a resident complaint filed with the city or by police direction, per § 42-263(b). Under § 42-268, violating the noise article is a simple misdemeanor or a municipal infraction, carrying a criminal or civil penalty as set by Municipal Code § 1-15.

Quiet Hours

Des Moines residential zones face a stricter nighttime noise limit, 60 dBA and 50 dBC from 10 p.m. to 7 a.m., under the city's sound-level ordinance, enforced by the community development and police departments.

Key details: Nighttime limit: 60 dBA / 50 dBC. Curfew hours: 10 p.m.–7 a.m.. Zones covered: Residential (P1, N1-N5, etc.). Enforced by: Community Development & Police. Max penalty: $750 (repeat: $1,000).

A violation is a simple misdemeanor or municipal infraction under § 42-268, punishable by a civil penalty of up to $750 per violation, or up to $1,000 for a repeat offense, per § 1-15(c).

The Bottom Line

Des Moines'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 Des Moines is broadly strict or permissive.

All of the above reflects Des Moines'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.