Mosinee, WI Outdoor Lighting: Light Trespass & Shielding (2026)

Section 42-739, "External lighting," is one of seven performance standards Mosinee applies only to industrial developments, grouped in Division 5 of Chapter 42's zoning article (§§ 42-736 through 42-743). " The lighting rule itself is narrow but absolute: no operation on M-1 (light industrial) or M-2 (heavy industrial) zoned land may run a light source that is directly visible once you are standing outside that district's boundary line, whether that boundary faces a residential block, a road, or another business. and 65 dBA overnight at the property line, and § 42-738 bars vibration perceptible at the property line, both carved out with exemptions for construction noise and things outside the operator's control.

Because § 42-739 lives inside the industrial performance-standards division, it does not reach a residential floodlight, a store's parking-lot pole light, or landscape lighting anywhere outside the M-1 and M-2 districts; Mosinee's code has no general outdoor-lighting or dark-sky ordinance covering the rest of the city. A proposed industrial building's lighting plan is reviewed up front through the zoning permit (§ 42-64) and site plan approval (§ 42-66) process before the zoning administrator, giving the city a chance to flag glare issues before construction rather than only after a complaint.