OSHA Portable Restroom Requirements for Construction Sites
The short answer: OSHA 29 CFR 1926.51(c)(1) requires one toilet facility for 20 or fewer workers, one toilet seat and one urinal per 40 workers once you have 20 or more, and one toilet seat and one urinal per 50 workers at 200 or more. Facilities must be kept sanitary and be readily accessible to the crew.
Those minimums are the floor, not the plan. This guide covers the table itself, what OSHA means by a toilet being "provided", how to size restrooms for a real crew, and the practical decisions (servicing, accessibility, placement) that keep a site compliant and usable.
How many portable toilets does OSHA require on a construction site?
OSHA sets the minimum number of toilet facilities by the number of employees on site. This is Table D-1 in 29 CFR 1926.51(c)(1).
| Number of employees | Minimum facilities required |
|---|---|
| 20 or fewer | One toilet facility |
| 20 or more | One toilet seat and one urinal per 40 workers |
| 200 or more | One toilet seat and one urinal per 50 workers |
Under temporary field conditions, provisions must be made to ensure at least one toilet facility is available. State and local requirements can be stricter than the federal minimum, so confirm the rules for your jurisdiction.
What does it mean for a toilet to be "provided"?
A toilet that exists but is not usable does not satisfy the standard. OSHA has interpreted 1926.51(c)(1) to mean that a toilet in an unsanitary condition is not "provided" for compliance purposes. In practice that makes the servicing schedule part of compliance, not just comfort.
Access matters too. OSHA guidance indicates facilities should be close enough that workers have prompt access, generally understood as reachable in under about ten minutes. On a large or spread-out site, that usually means several placements rather than one bank of units at the gate.
How to size restrooms for your crew
Start with the OSHA minimum, then adjust for how the site actually runs. Factors worth weighing:
- Crew size at peak, not average, since headcount often climbs mid-project.
- Shift length and whether crews overlap.
- How spread out the site is, and travel time from the far end.
- Whether the crew includes workers who need an ADA-accessible unit.
- Whether hand-wash stations are needed alongside the units.
Sizing to the legal floor on a growing site is how crews end up out of compliance halfway through a job. Building in headroom is cheaper than a mid-project scramble.
Servicing and accessibility
Standard practice on most construction sites is weekly servicing, which covers cleaning, restocking, and waste removal. High-traffic sites and large crews commonly move to twice weekly, and short-duration high-use situations sometimes need daily service. Because sanitary condition is tied to compliance, the right cadence is the one that keeps units usable between visits, not the cheapest one on paper.
ADA-accessible units provide a larger interior with handrails and support bars for sites that need to accommodate workers with disabilities. It is worth confirming what your project and jurisdiction require rather than assuming standard units are sufficient. We deploy portable restrooms across multi-site programs and coordinate placement and servicing through a single point of contact, and you can see where we work on the service areas page.
Frequently asked questions
How many portable toilets does OSHA require on a construction site?
Under 29 CFR 1926.51(c)(1), one toilet facility for 20 or fewer workers, one toilet seat and one urinal per 40 workers once you have 20 or more, and one toilet seat and one urinal per 50 workers at 200 or more. Under temporary field conditions at least one facility must be available.
Does a dirty portable toilet count as compliant?
No. OSHA has interpreted the standard to mean a toilet in an unsanitary condition is not "provided" for compliance purposes, which makes your servicing schedule part of staying compliant rather than just a comfort decision.
How close do portable restrooms need to be to workers?
OSHA guidance indicates facilities should allow prompt access, generally understood as reachable in under about ten minutes. On large or spread-out sites that usually means multiple placements rather than a single bank of units.
How often should portable restrooms be serviced on a job site?
Weekly servicing is standard on most construction sites, with twice weekly common for high-traffic sites or large crews, and daily service used for short-duration high-use situations. The correct cadence is whatever keeps units sanitary between visits.
Do construction sites need ADA-accessible portable restrooms?
Sites that must accommodate workers with disabilities need wheelchair-accessible units with a larger interior, handrails, and support bars. Confirm what your project and jurisdiction require rather than assuming standard units are sufficient.
Source: OSHA 29 CFR 1926.51, Sanitation. Requirements can vary by state and local jurisdiction. Confirm the rules that apply to your site.