2 rules for unincorporated Waukesha County, Wisconsin.
Verified from official government sources
Waukesha County has no countywide dark-sky ordinance. Its town zoning code controls glare only for commercial/parking lighting, requiring cut-off fixtures that don't throw light onto neighbors. Residential dark-sky standards, where they exist, are set by individual cities and villages.
Waukesha County Basic Zoning Ordinance Sec. 3.13(5)
Lights provided in any parking area shall be hooded or beamed so as not to create undesirable glare or illumination of adjacent residential properties.
Waukesha County's town zoning code limits light spillover for parking/commercial lighting: no more than 0.2 footcandles at residential property lines and 0.5 footcandles at other property lines, using cut-off fixtures. There is no residential-to-residential light-trespass rule; that is handled by municipal nuisance law.
Waukesha County Basic Zoning Ordinance Sec. 3.13(5)(b)
Lights levels shall not exceed 0.2 footcandles at residential property lines and 0.5 footcandles at all other property lines.
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