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.
There is no countywide Rock County ordinance on vehicle noise. Statewide, Wis. Stat. 347.39(1) requires every motor vehicle to have a muffler in good working order that prevents excessive or unusual noise, and bars muffler cutouts or bypasses on highways. Loud car stereos or revving in public also fall under Janesville's 9.42.020 ban on loud or raucous amplified and unnecessary noise. Enforcement is by local police and the county sheriff on the roads. For chronic vehicle-noise disturbances not on a highway, the disorderly-conduct statute 947.01 can apply.
A defective-muffler or excessive-noise violation under Wis. Stat. 347.39 is a non-criminal traffic forfeiture. Local nuisance-noise citations in Janesville run about $25 to $500 plus costs.
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