OSHA Porta Potty Requirements for Job Sites, in Plain English
What the federal rules actually say about toilets and hand-washing on construction, oilfield and farm sites, with the official text linked and the legal minimum kept separate from practical advice.
What does OSHA require for porta potties on a construction site?
OSHA 29 CFR 1926.51(c) requires toilets on every construction site based on crew size: 1 toilet for 20 or fewer workers, 1 seat and 1 urinal per 40 workers from 21 to 199, and 1 seat and 1 urinal per 50 workers at 200 or more. Sites with a mobile crew and nearby transport are exempt.
| Workers on site | OSHA minimum (29 CFR 1926.51 Table D-1) | Our recommendation with weekly service |
|---|---|---|
| 1–10 | 1 toilet | 1 standard unit |
| 11–20 | 1 toilet | 2 standard units |
| 21–40 | 1 toilet seat + 1 urinal (1 standard unit) | 3–4 units |
| 41–80 | 2 seats + 2 urinals | 5–8 units |
| 81–120 | 3 seats + 3 urinals | 9–12 units |
| 121–199 | 4–5 seats + urinals | 13–20 units, or half with twice-weekly service |
| 200+ | 1 seat + 1 urinal per 50 workers | 1 unit per 10–15 workers, serviced 2–3 times a week |
Read the official text: OSHA 1926.51 Sanitation.
Does a standard porta potty count as a seat and a urinal?
Yes. A standard porta potty has both a toilet seat and a urinal inside, so one unit counts as 1 seat and 1 urinal for the OSHA table. A crew of 40 is covered by one standard unit at the legal minimum, although that unit would fill in about two days.
That gap between the legal minimum and real use is why we recommend 1 unit per 10 workers with weekly service. The minimum keeps you compliant; the recommendation keeps the unit usable all week.
When does OSHA require hand-washing on a job site?
OSHA 1926.51(f) requires adequate washing facilities when workers apply paint, coatings, herbicides or insecticides, or work with other harmful contaminants. The facilities must be close to the work area and supplied with water, soap and towels. A two-sink hand-wash station covers this on most sites.
Sanitizer alone does not meet the washing-facility rule when it applies. See our hand-wash stations.
What are the OSHA rules for farm field crews?
OSHA 1928.110 requires agricultural employers with 11 or more hand-labor field workers to provide 1 toilet and 1 hand-wash facility for every 20 workers, located within a quarter-mile walk of the work. Toilets must be cleaned and kept stocked, and water must be potable.
Read OSHA 1928.110 Field Sanitation. In Lea County and Gaines County, this matters most during harvest and dairy hiring.
Do oilfield sites follow the same rules?
Oilfield construction such as pad building, pipeline and facility work generally falls under 1926.51, while ongoing production operations fall under general industry rule 1910.141, which also requires toilets based on headcount. Many operators set stricter company standards, which we match on request.
How do you stay compliant without overpaying?
Stay compliant by counting your peak crew, not your average, checking the OSHA table, then choosing service frequency instead of extra units where you can. Ten workers on one unit serviced weekly is compliant and practical; forty workers on one unit is compliant on paper and unusable by Wednesday.
Use the crew calculator or call and we size it with you. We do not give legal advice; confirm with your safety officer for your site.
Questions people ask before booking
Is hand sanitizer enough on a construction site?
For most crews, sanitizer in each unit is fine. When workers handle paint, coatings, pesticides or other harmful materials, OSHA 1926.51(f) calls for real washing facilities.
Do small crews of 2 or 3 need a porta potty?
Yes, unless they are a mobile crew with transport to nearby toilets. One unit covers any crew of 20 or fewer.
Does OSHA say how often to clean portable toilets?
OSHA requires toilets to be kept sanitary and supplied. Weekly service is the industry norm for 10 users; busier units need more.
Get a written quote
Six quick fields. Connor texts back an itemized price with the unit, delivery, pickup, servicing and tax on separate lines. Quotes go out by text in about 15 minutes during business hours.
In a hurry? Calling is faster.
Call now(575) 213‑3495Phone: (575) 213-3495 · Mon–Sat, 7 a.m.–7 p.m. Mountain