Amplified music rules in Rock County, WI — also called sound permit, PA system, or live music ordinances — set decibel limits, time-of-day restrictions, and when permits are required.
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.
Amplified music is regulated by cities and towns, not by a Rock County dB code. Janesville is explicit: section 9.42.020 states no person shall, through sound amplifiers or other instruments, make or emit loud or raucous noises in public streets, public parks, or other public places. That reaches PA systems, car stereos in public, and amplified performances. On private property, the same 'unnecessary and annoying noise' clause applies. Beloit and the towns use their own nuisance sections. Serious amplified disturbances can also be charged as disorderly conduct under Wis. Stat. 947.01.
Janesville forfeitures for amplified-noise nuisance run roughly $25 to $500 plus costs. A loud amplified disturbance that provokes a disturbance may be charged as a Class B misdemeanor under state law.
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