OSHA 1926.51: 85 workers, how many toilets and urinals?
For 85 workers on a construction site, OSHA 1926.51 requires at least three standard portable toilets and two portable urinals. The OSHA standard specifies that for 20 to 199 workers, you must provide one toilet seat and one urinal per 40 workers. With 85 workers, you must have at least 85/40 = 2.125 toilet seats and the same number of urinals, so you round up to three toilets and three urinals. However, when both toilets and urinals are provided, OSHA allows one urinal to substitute for one toilet seat in the required number of facilities. This means you can provide three toilets and two urinals to meet the requirement for five total facilities.
Planning for the crew
Rent a cluster of three standard units and two portable urinals. Place them on level ground with good truck access for the vacuum truck. For a long-term site, schedule weekly service as the minimum. In Phoenix heat, consider a mid-week check for paper and deodorizer.
Accessibility is mandatory
The ADA 5 percent cluster rule applies when you have multiple units. A cluster of five units requires at least one ADA-compliant unit. Include it in your count. The ADA-compliant unit provides the required turning space.
Beyond the minimum
The OSHA count is a legal floor. For crew satisfaction on an 8 to 10-hour shift, I always add one extra standard unit. It cuts down on line complaints, especially after breaks. With that, your order becomes four standard units, two urinals, and one ADA-compliant unit.
Post your specific site details if you want a check on the setup.