Backyard bands, patio speakers and outdoor events are regulated by your city, village or town, not the county. Waukesha County has no noise chapter. Outdoor music that unreasonably disturbs neighbors is a public nuisance and may need a local amplified-sound or event permit.
The county code is silent on outdoor music, so rules come from your municipality. The City of Waukesha's Code 12.05 nuisance standard reaches outdoor music, live performances and speakers that unreasonably disturb the peace and quiet of the vicinity. Municipalities frequently pair this with special-event or amplified-sound permits and quiet-hours limits (often 10 p.m.–7 a.m.). In consenting unincorporated towns, the county zones property but leaves outdoor-music noise to the town, with Wis. Stat. 947.01 disorderly conduct as the fallback for unreasonably loud performances that provoke a disturbance. Coordinate large outdoor events with your municipal clerk in advance.
Local nuisance and permit-violation forfeitures apply, set by your municipality. Unreasonably loud outdoor music that provokes a disturbance can be disorderly conduct under Wis. Stat. 947.01.
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