29 CFR 1926.51(c)
Restrooms by crew size
Toilets are required by headcount: one for 20 or fewer employees, one toilet seat and one urinal per 40 workers above that, and one per 50 at 200 or more. Sites without a sanitary sewer use chemical, recirculating or combustion toilets or privies, unless local codes prohibit them.1 See the OSHA portable toilet guide.
