Guides and regulations
Wisconsin PortableRestroom Guides
The rules that decide how many units you need, who is legally allowed to service them, and what changes below freezing. Every figure here is traced to a named authority and dated, because sizing a job site or an event on a half-remembered rule of thumb is how orders go wrong.
U.S. Occupational Safety and Health Administration · 29 CFR 1926.51(c)
OSHA Porta Potty Requirements for Wisconsin Construction Sites
OSHA 29 CFR 1926.51(c) requires one toilet for 20 or fewer workers on a construction site, one toilet seat and one urinal per 40 workers for crews of 21 to 199, and one of each per 50 workers at 200 or more. The count is based on the maximum number of workers on site at any one time, and a unit only counts if it is clean and functional.
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Individual Wisconsin municipalities; Portable Sanitation Association International · Municipal special event ordinances; PSAI event guidance
Wisconsin Special Event Restroom Requirements and Permit Guide
Wisconsin has no statewide portable restroom ratio for public events. Requirements are set by each municipality, and only a minority publish a binding numeric table. The City of Waukesha publishes one of the state's most detailed tables, requiring 4 toilets for a 1,000-person two-hour event and 72 toilets for a 10,000-person ten-hour event, counted at peak attendance rather than aggregate.
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Individual Wisconsin municipalities; Portable Sanitation Association International · Municipal special event ordinances; PSAI event guidance
How Many Porta Potties Do I Need? Wisconsin Sizing Guide
For events, plan one standard portable restroom per 50 guests over an 8-hour period, then add 10 to 20 percent if alcohol is served. For construction sites, OSHA requires one toilet for 20 or fewer workers, then one toilet seat and one urinal per 40 workers. Both figures are minimums that assume units are serviced often enough to stay clean.
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Portable sanitation industry standard practice · Industry winterization practice
Winter Porta Potty Rental in Wisconsin: Freeze Protection Guide
Portable restrooms placed in Wisconsin between roughly late November and March require antifreeze charging at every service visit, because freezing waste expands and can crack the holding tank. Winter rental typically runs $195 to $340 per unit per month against $150 to $275 in summer, and hand-wash stations are normally pulled and replaced with sanitizer dispensers.
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Wisconsin Department of Natural Resources; Wisconsin Department of Safety and Professional Services · Wis. Admin. Code ch. NR 113 and ch. NR 114; Wis. Admin. Code ch. SPS 391
How to Verify a Wisconsin Porta Potty Company Is Licensed
In Wisconsin, any business that services or disposes of portable restroom waste must hold a septage servicing license under Wis. Admin. Code ch. NR 113, administered by the Department of Natural Resources, and must designate a certified operator-in-charge under ch. NR 114. Ask any supplier for the NR 113 license number of the business that will actually service your units.
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