OSHA Porta Potty Rules for Construction Crews
By Kurt, owner of Kurt Rental Works. Updated October 12, 2026. 6 min read.
How many job site toilets OSHA requires for your crew, what the handwashing rule says, and how to plan service on a Columbus-area site.
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OSHA porta potty requirements for construction come from 29 CFR 1926.51(c), Table D-1. A crew of 20 or fewer workers needs at least 1 toilet, and a larger crew needs 1 toilet seat and 1 urinal per 40 workers. At 200 or more workers, the ratio becomes 1 seat and 1 urinal per 50 workers.
What does OSHA Table D-1 say about job site toilets?
OSHA Table D-1 sets 3 tiers for construction toilets, starting with 1 toilet for sites with 20 or fewer workers. Sites with 20 or more workers need 1 toilet seat and 1 urinal per 40 workers. Sites with 200 or more workers need 1 toilet seat and 1 urinal per 50 workers.
The rule sits in OSHA standard 29 CFR 1926.51, the sanitation section for construction. Paragraph (c) covers toilets at job sites. The numbers below are copied from that table.
| Number of employees | Minimum number of facilities (Table D-1) |
|---|---|
| 20 or fewer | 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 |
The table counts people on site, not trades or companies. If three subs share one site, count every worker who will be there at the same time. Round up any partial result to the next whole number.
How many porta potties does a crew of 8, 25 or 60 need?
A crew of 8 workers needs 1 porta potty under OSHA Table D-1. A crew of 25 needs 1 seat and 1 urinal, which one standard unit with a built-in urinal covers. A crew of 60 needs 2 seats and 2 urinals, so plan on 2 standard units at minimum.
Here is the math for each crew size. A standard porta potty has a toilet seat and a small urinal inside, so one unit counts toward both numbers.
| Crew size | Table D-1 math | Legal minimum | What we suggest |
|---|---|---|---|
| 8 workers | 20 or fewer = 1 toilet | 1 unit | 1 standard unit, weekly service |
| 25 workers | 25 ÷ 40 = 0.6, round up to 1 seat + 1 urinal | 1 unit with urinal | 2 units, or 1 unit with 2x weekly service |
| 60 workers | 60 ÷ 40 = 1.5, round up to 2 seats + 2 urinals | 2 units with urinals | 3 units, or 2 units with 2x weekly service |
The right column is our recommendation, not the law. Meeting the minimum does not mean the units will stay usable all week. A busy crew fills a single unit fast, and lines at break time cost you labor hours.
Counting workers on a growing site
Plan for your peak crew, not your average. If framing brings 18 people and drywall brings 30, size for 30 during that phase. You can add units mid-job and remove them when the crew shrinks.
Does OSHA require handwashing stations on construction sites?
OSHA 29 CFR 1926.51(f) requires washing facilities when workers handle paints, coatings, herbicides, insecticides or other harmful contaminants. The facilities must be in near proximity to the work and kept sanitary. Many contractors add 1 handwashing station per site even when the rule does not strictly apply.
The handwashing rule is in paragraph (f) of the same 1926.51 standard. It ties the need to the type of work, not to crew size. Painting, concrete work, roofing tar and chemical spraying are common triggers.
A porta potty with hand sanitizer is not the same as a place to wash with water. If your work involves harmful substances, plan for real water. You can add a 2-sided handwashing station for your job site next to the toilets.
Does Ohio have its own porta potty rules for construction?
Ohio follows federal OSHA for private employers, so Table D-1 is the rule on most Ohio job sites. Ohio does not run its own OSHA plan for private businesses. Public employers in Ohio fall under a separate state program called PERRP, which you can check if you work for a city or school.
For a private builder in Columbus, Dublin, Delaware or anywhere in central Ohio, the federal numbers apply. A city or county contract may add its own site rules in the bid documents. Read your contract and ask your general contractor if anything stricter applies.
How often should construction porta potties be serviced?
Construction porta potties are usually serviced 1 time per week, and weekly service is included with our 28-day rentals. Each visit pumps the waste, cleans and disinfects the unit, and restocks toilet paper and hand sanitizer. Crews larger than the table minimum often add 2x or 3x weekly service.
OSHA asks that toilets be kept sanitary, but it does not name a service schedule. A unit that overflows before the next visit is not sanitary. Match service to how hard the units get used.
- Small crew, light use: weekly service is usually enough.
- Crew near the next Table D-1 tier: add a second unit or a second weekly visit.
- Hot summer weeks or long shifts: consider 2x weekly service to control odor.
Long jobs bill per 28-day cycle and renew until you call for pickup. See construction porta potty rental in Columbus for how the service visits and billing work.
Where should toilets go on a construction site?
Construction toilets should sit on flat, firm ground where the service truck can park within about 15 feet. Keep units out of the path of heavy equipment and away from trenches. Placing toilets in 1 central spot near the break area helps crews use them and keeps service visits fast.
Mark the spot with paint or a stake before delivery. Give us the gate code or lockbox details if the site is fenced. Nobody needs to be on site when the truck arrives.
Want help with the count for a mixed crew? Use the porta potty sizing guide for crews and events, then call (614) 295-9744 with your ZIP, start date and crew size for a quote.