Porta Potties for Construction Sites: What You Need to Know
Short answer
OSHA's 29 CFR 1926.51 requires toilets on construction sites: one for 20 or fewer workers, then one toilet seat and one urinal per 40 workers, and per 50 from 200. In practice, plan on about one unit per 10 workers with weekly service, placed near the work and moved as the site changes.
If you run a job site, restrooms are a requirement, not a nice extra. But meeting the rule is the easy part. The harder part is keeping units where people are working, clean enough that people use them, and moving them as the job changes.
This guide covers what the OSHA rule says, how many units to plan for, and the practical details that decide whether your crew uses the units or wanders off to find a gas station.
What does OSHA require?
OSHA's sanitation standard for construction is 29 CFR 1926.51. It requires employers to provide toilets at the job site, and the minimum number depends on the size of the crew:
- 20 workers or fewer: at least 1 toilet.
- 20 or more workers: 1 toilet seat and 1 urinal for every 40 workers.
- 200 or more workers: 1 toilet seat and 1 urinal for every 50 workers.
Is the OSHA minimum enough?
The OSHA table tells you the least you can get away with. It doesn't tell you how many units stay usable through the week.
Most contractors plan on about one unit per 10 workers with weekly service. A 30-person crew on one unit might be legal on paper, but by midweek nobody will want to use it. More units, more frequent service, or both, is what keeps the crew on site instead of driving off to find a restroom.
Do job sites need handwashing?
OSHA also requires washing facilities in some situations, for example where workers handle paints, coatings, herbicides or other substances that are harmful on the skin. Even where it isn't strictly required, a handwashing station next to the restrooms is cheap and appreciated, especially when crews eat on site.
Where should the units go?
Placement decides whether units get used. A few things to get right:
- Close to the work. A unit at the far gate costs every worker several minutes per trip, all day.
- On firm, level ground. A unit that rocks or leans doesn't latch properly and gets avoided.
- Where the service truck can reach. Servicing is done with a hose from the truck. If materials, a dumpster or a fence block the way, the unit doesn't get serviced.
- Away from traffic. Keep units out of the way of equipment and delivery routes.
- Out of low spots. Avoid areas that turn to mud or pond after rain.
When should units be moved?
On bigger projects, the active work area shifts. The spot that made sense during site work may be inside the building footprint by framing. Plan to move units a few times over a long job, and give your rental company notice so the move can be scheduled.
The same goes for access. A path the truck could use in month one might be fenced off by month three. Let us know when things change so no service visit is missed.
How often should job-site units be serviced?
Weekly service is the usual baseline for a unit shared by up to about 10 workers. Crews that are bigger than that, long shifts, weekend work and hot weather all call for more frequent service. On a long project, the schedule should change when the crew does.
What changes in winter?
In freezing weather, set units out of the wind where you can, and ask about cold-weather treatment so the tank doesn't freeze. Keep the path to the units clear of snow and ice, for the crew and for the service truck. It's much easier to sort out before the first hard freeze than after.
Quick answers
Do subcontractors need their own porta potties?
Can a porta potty go on the street in front of a job?
How often should job-site units be cleaned?
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