OSHA Porta Potty Requirements for Construction Sites
The exact OSHA counts for job-site toilets and handwashing, what counts as a toilet, and how contractors around Yonkers and NYC usually set up their sites.
By Robert, owner. Reviewed October 22, 2026.
What does OSHA require for porta potties on a job site?
OSHA's construction sanitation rule, 29 CFR 1926.51(c), requires toilets at every job site based on crew size. Sites with 20 or fewer workers need at least 1 toilet. Sites with 20 or more need 1 seat and 1 urinal per 40 workers, and 200 or more need 1 seat and 1 urinal per 50.
| Number of workers | Minimum facilities (OSHA Table D-1) | Example |
|---|---|---|
| 20 or fewer | 1 toilet | A 12-person framing crew: 1 unit |
| 20 or more | 1 toilet seat and 1 urinal per 40 workers | A 45-person crew: 2 units |
| 200 or more | 1 toilet seat and 1 urinal per 50 workers | A 220-person site: 5 units |
Official text: OSHA 29 CFR 1926.51.
Does OSHA require handwashing stations on construction sites?
OSHA 1926.51(f) requires washing facilities when workers handle paints, coatings, herbicides, insecticides or other harmful contaminants. The facilities must be close to the work and kept clean. Painters, roofers, demolition crews and anyone working with lead or concrete should plan a handwashing station.
Rent a portable handwashing station.
Do mobile crews need a porta potty?
OSHA's toilet table doesn't apply to mobile crews that have quick transportation to nearby toilets, under 1926.51(c)(4). Road, utility and landscaping crews that move several times a day often rely on that exception. Crews that stay at one spot for more than a short while should have a unit on site.
For crews that move every few days, a towable unit on a trailer is an option. See construction porta potty rental.
What are OSHA's porta potty rules for farms?
OSHA's field sanitation rule, 29 CFR 1928.110, requires 1 toilet and 1 handwashing facility for every 20 farmworkers. The units must be within a quarter-mile walk of the workers, or at the nearest vehicle access point if fields are farther. The rule applies to farms with 11 or more hand-labor workers.
Official text: OSHA 1928.110.
What is the legal minimum vs. what works on a real site?
The OSHA minimum is a floor, not a service plan. One unit for 20 workers fills in two or three days, so we recommend 1 unit per 10 workers with weekly service, or twice-weekly service for bigger crews. Your contract or GC may set a higher standard than OSHA.
This guide explains federal rules; it is not legal advice. Check your contract, the GC's safety plan and any city requirements.
Keep planning: rent construction site units, add handwashing stations, rent by the month, or see what weekly service covers.
Questions renters ask
Do OSHA rules require separate toilets for men and women?
OSHA's general sanitation rule, 29 CFR 1910.141(c), does not require separate facilities when each toilet is single-occupancy and locks from the inside. A standard porta potty is single-occupancy with an inside lock, so one row can serve a mixed crew. Confirm with your safety officer.
Is a porta potty required if the house has a bathroom?
OSHA allows workers to use an existing toilet only if it is available to them and meets the rule. Many homeowners don't want crews in the house, so contractors bring a unit to keep the peace and stay compliant.
How often must job-site porta potties be cleaned?
OSHA requires toilets to be kept sanitary but doesn't set a schedule. Weekly service is the industry norm. Large crews often need twice-weekly service to stay clean.