OSHA Toilet Requirements for Construction Sites
The federal rule for job-site toilets is 29 CFR 1926.51, “Sanitation”. Here is what paragraphs (c) and (f) require, quoted from the regulation, and what it means for how many porta potties you rent.
1926.51(c)(1): the Table D-1 ratios
“Toilets shall be provided for employees according to the following table”:
| Number of employees | Minimum number of facilities (Table D-1) |
|---|---|
| 20 or less | 1 |
| 20 or more | 1 toilet seat and 1 urinal per 40 workers |
| 200 or more | 1 toilet seat and 1 urinal per 50 workers |
A standard porta potty has one seat and usually one urinal, so in practice crews rent one unit per 40 workers (per 50 at 200 or more), rounding up. Worked examples:
| Crew size | Table D-1 minimum |
|---|---|
| 10 workers | 1 toilet |
| 20 workers | 1 toilet |
| 40 workers | 1 toilet seat + 1 urinal |
| 80 workers | 2 toilet seats + 2 urinals |
| 120 workers | 3 toilet seats + 3 urinals |
| 200 workers | 4 toilet seats + 4 urinals |
| 300 workers | 6 toilet seats + 6 urinals |
These are federal minimums. Your state plan or contract may require more, and heavy use may need more frequent servicing rather than more units.
1926.51(c)(2)–(4): field conditions, types and mobile crews
- (c)(2): “Under temporary field conditions, provisions shall be made to assure not less than one toilet facility is available.”
- (c)(3): job sites without a sanitary sewer must have privies (where they won't contaminate ground or surface water), chemical toilets, recirculating toilets or combustion toilets, “unless prohibited by local codes”. A rented porta potty is a chemical toilet.
- (c)(4): paragraph (c) does not apply to “mobile crews having transportation readily available to nearby toilet facilities.”
1926.51(f): washing facilities
- (f)(1): crews applying paints, coatings, herbicides or insecticides, or doing other work with harmful contaminants, need adequate washing facilities near the worksite.
- (f)(3)(i): “Lavatories shall be made available in all places of employment,” except mobile crews or normally unattended locations with transport to nearby washing facilities.
- (f)(3)(ii)–(iv): each lavatory needs hot and cold or tepid running water, hand soap or a similar cleanser, and individual towels or air blowers.
Many rental handwash stations use fresh-water tanks and foot pumps. Whether a particular station satisfies (f)(3) for your site is worth confirming with your safety lead, especially in freezing weather.
ADA and job sites
Under §203.2 of the 2010 ADA Standards, portable toilets used only by construction personnel don't need to be accessible. Units the public can use, such as at events or public works open to visitors, fall under §213.2 Exception 3, which requires “no more than 5 percent” of each cluster to be accessible. In practice, plan at least one accessible unit per cluster.
Next: price it with the construction porta potty cost guide, size it with the calculator, check unit dimensions, or find providers near you.
Frequently asked questions
How many toilets does OSHA require on a construction site?
29 CFR 1926.51(c)(1), Table D-1: 20 or fewer employees, 1 toilet. 20 or more employees, 1 toilet seat and 1 urinal per 40 workers. 200 or more employees, 1 toilet seat and 1 urinal per 50 workers.
Does OSHA require handwashing stations on construction sites?
Yes. 1926.51(f)(3) requires lavatories to be made available, with hot and cold or tepid running water, hand soap or a similar cleanser, and individual towels or air blowers. Mobile crews and normally unattended locations are exempt if workers have transport to nearby washing facilities.
Are construction porta potties required to be ADA accessible?
No. §203.2 of the 2010 ADA Standards says portable toilets provided only for construction personnel on a construction site don't have to comply with the accessible-toilet rules (§213) or be on an accessible route.