10 county-level rules, plus city-specific rules for 1 city in Polk County, Iowa.
Verified from official government sources
Unincorporated Polk County has no countywide decibel-based quiet-hours ordinance. Noise is handled as a nuisance and, for zoned uses, must not be excessive at the lot line. Inside Des Moines, Ankeny, or other cities, the city's noise ordinance and its nighttime quiet hours apply.
Polk County Zoning Ordinance, Public Services performance standard
No odor, noise, glare, vibration, dust or electrical interference shall be excessive at the lot lines.
Polk County's zoning code does not set countywide construction start/stop hours for ordinary building. Construction noise must not be excessive at the lot line, and specific uses carry their own hours. Cities within Polk County set their own construction-hour limits.
A persistently barking dog can be treated as a nuisance in unincorporated Polk County and reported to Polk County animal control, contracted through the Animal Rescue League of Iowa. Rabies and dangerous-dog matters follow Iowa Code Chapter 351.
Polk County has no ordinance specifically restricting leaf blowers in the unincorporated area. Leaf-blower noise is governed only by the general rule that noise not be excessive at the lot line. Any leaf-blower time or gas-model restrictions come from individual cities.
Outdoor events in unincorporated Polk County must meet the Polk County Noise Ordinance and obtain a sound permit if required, per the zoning code. Everyday amplified music is governed by the lot-line noise standard and nuisance rules; cities set their own amplified-sound limits.
Polk County Zoning Ordinance, outdoor event use conditions
The event(s) shall meet the Polk County Noise Ordinance requirements and obtain a sound permit if necessary.
Aircraft-in-flight noise is regulated federally by the FAA, not by Polk County. The county's zoning code references a 75-decibel noise cone defined by the Iowa DOT around airports and may require additional berm buffering to reduce airport noise. Des Moines International Airport is the metro's hub.
Polk County Zoning Ordinance, airport use standards
the 75 decibel noise cone as defined by the Iowa Department of Transportation.
Industrial and utility uses in unincorporated Polk County must keep noise from being excessive at the lot line, and heavy-industrial and extractive/disposal uses require conditional-use permits with noise-abatement plans. Home occupations must produce no noise detectable at the property line.
Polk County Zoning Ordinance, Home Occupations criteria
No odor, noise, vibration, dust and electrical interference shall be detectable at the property line.
Polk County does not set numeric decibel limits for general noise in the unincorporated area. Its zoning code uses a qualitative lot-line standard instead: noise must not be excessive at the property boundary. Cities in the county may set numeric dBA limits.
Polk County Zoning Ordinance, Public Services performance standard
No odor, noise, glare, vibration, dust or electrical interference shall be excessive at the lot lines. If deemed necessary, the Zoning Administrator may require certification from either a civil, mechanical, structural or electrical engineer licensed in the State of Iowa, that none of the above annoyances will be or are present at the lot line.
Outdoor music events in unincorporated Polk County must meet the Polk County Noise Ordinance, obtain a sound permit if needed, keep noise limited to the site, and are reviewed by the Sheriff's Department. Home-based outdoor music is governed by the lot-line standard.
Polk County Zoning Ordinance, outdoor event use conditions
light, noise and dust from the activity shall be limited to the site... The event(s) shall meet the Polk County Noise Ordinance requirements and obtain a sound permit if necessary... The event(s) shall be reviewed by the Polk County Sheriff's Department.
Statewide Iowa law requires every motor vehicle to have a working muffler and bans muffler cutouts and bypass devices. This applies on all highways in Polk County. The Sheriff and city police enforce it; a scheduled fine applies.
Iowa Code 321.436
Every motor vehicle shall at all times be equipped with a muffler in good working order and in constant operation to prevent excessive or unusual noise and annoying smoke, and no person shall use a muffler cutout, bypass or similar device upon a motor vehicle on a highway.
1 cities in Polk County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
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