10 county-level rules, plus city-specific rules for 3 cities in Rock County, Wisconsin.
Verified from official government sources
Rock County sets no countywide quiet-hours schedule. Loud or annoying noise is handled by each city or town plus Wisconsin's disorderly-conduct law. In Janesville, making unnecessary and annoying noise is prohibited at any hour.
Rock County has no countywide construction-hours limit. Cities and towns set their own daytime windows. Janesville does restrict aircraft used for construction, barring helicopter or aircraft construction work between 8:00 p.m. and 8:00 a.m.
Rock County regulates dogs mainly through licensing and dangerous-animal rules under Wis. Stat. Ch. 174. Habitual barking is treated as a noise nuisance by the cities and towns, and can trigger Wisconsin's disorderly-conduct law.
Neither Rock County nor Wisconsin sets a leaf-blower decibel limit or time restriction. Leaf-blower noise is governed by local nuisance rules. In Janesville, it must not become 'unnecessary and annoying noise' under section 9.42.020.
Rock County has no countywide amplified-sound ordinance. In Janesville, using sound amplifiers to emit loud or raucous noise in public streets, parks, or places is prohibited under Municipal Code section 9.42.020.
Aircraft-in-flight noise is regulated by the FAA, not Rock County. Locally, Janesville bans helicopter or aircraft use for construction between 8:00 p.m. and 8:00 a.m. under Municipal Code section 9.42.025.
Rock County zones unincorporated towns and can address industrial nuisances there, but sets no countywide industrial dB limit. Cities like Janesville regulate factory noise through nuisance and zoning rules, backed by state disorderly-conduct law.
Rock County sets no numeric decibel limit, and Wisconsin has no statewide dB standard. Noise is judged by a nuisance test: whether it is 'unnecessary and annoying' or 'loud or raucous,' as in Janesville's Municipal Code 9.42.020.
Rock County has no countywide outdoor-music ordinance. Cities and towns control it through nuisance rules and event permits. In Janesville, loud or raucous outdoor amplified sound in public places is barred under 9.42.020.
Rock County sets no vehicle-noise decibel limit. Loud mufflers and exhaust are governed statewide by Wis. Stat. 347.39, which requires an adequate muffler that prevents excessive or unusual noise. Cities add local nuisance rules.
3 cities in Rock County have their own noise ordinances rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Rock County — parking, noise, fences, fires, animals, pools, and more.
Rock County Ordinance Hub →