Ames, IA Noise Ordinances: Decibel Limits (2026)
Key Facts
- Residential daytime limit
- 60 dB, 7 a.m. to midnight
- Residential nighttime limit
- 55 dB, midnight to 7 a.m.
- Commercial / park zones
- 65 dB
- Industrial zones
- 80 dB
- First-violation penalty
- $50 municipal infraction
Summary
In the City of Ames, Iowa, sound measured at the property line or right-of-way is capped by neighborhood type under Ames Municipal Code Sec. 16.4(4)(c): 60 decibels in residential areas from 7 a.m. to midnight, dropping to 55 overnight, 65 in commercial and park or agricultural zones, and 80 in industrial areas. Exceeding these levels is unlawful and enforced under Chapter 16, Noise Control.
(c) A sound measured or registered in excess of the maximum permitted levels according to the following table, is declared to be excessive and unusually loud and is unlawful. Neighborhood Characteristic Maximum Permitted Residential 60 between 7 a.m. to Midnight 55 between Midnight to 7 a.m. Commercial 65 Industrial 80 Park or Agriculturally Zoned 65
Full Breakdown
Chapter 16 of the Ames Municipal Code, Noise Control, sets objective decibel ceilings rather than a subjective disturbance standard. Sec. 16.4(4)(a) directs that sound be measured at the edge of the city street or alley right-of-way nearest the source, or about 25 feet away if the source sits in a park or agriculturally zoned area, using an A-weighted, slow-response sound level meter under Sec. 16.3. Sec. 16.4(4)(c) then sets the ceiling by neighborhood characteristic: 60 dB in residential areas between 7 a.m. and midnight, falling to 55 dB overnight from midnight to 7 a.m.; 65 dB in commercial areas; 80 dB in industrial areas; and 65 dB in parks or agriculturally zoned land.
A reading above the applicable number is declared excessive and unusually loud, and is unlawful under Sec. 16.4(1), unless the sound is made under a permit issued under Sec. 16.6. Sec. 16.4(2) and (3) put an affirmative duty on anyone who owns, possesses, or controls premises, and on anyone leading an assembly or gathering, to keep sound on that site under the applicable limit; failing that duty is itself a violation. Sec. 16.9 makes any breach of Chapter 16 a municipal infraction carrying a $50 penalty for a first violation and $100 for each repeat violation, and a peace officer may instead charge it as a simple misdemeanor. Emergency vehicles, licensed parades and fireworks displays, government-property activities, nonprofessional athletic contests, and construction work are excused from the chapter under Sec. 16.8.
Violations & Fines
A sound reading above the table in Sec. 16.4(4)(c) is unlawful under Sec. 16.4(1) and punishable under Sec. 16.9 as a municipal infraction: $50 for a first violation and $100 for each repeat violation, with each day of an ongoing exceedance counting separately. A city peace officer may instead charge the noise as a simple misdemeanor rather than issue a civil infraction.
Frequently Asked Questions
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Sources & Official References
Other rules in Ames
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