OSHA Porta Potty Requirements for Construction Sites, Explained

OSHA requires toilets on every construction jobsite under 29 CFR 1926.51(c). A crew of 20 or fewer needs at least one toilet. Larger crews need one toilet seat and one urinal per 40 workers, and crews of 200 or more need one of each per 50 workers. Handwashing is also required.

What does OSHA 1926.51 say about toilets?

OSHA 1926.51 says employers must provide toilets at construction jobsites for their employees. The rule sets a minimum number of toilets based on crew size in Table D-1. The rule is part of OSHA 29 CFR 1926.51, the sanitation section for construction work.

Here is Table D-1 in plain terms:

The rule also covers sites without sewer service. Job sites with no sanitary sewer must have privies, chemical toilets, recirculating toilets, or combustion toilets, unless local codes say otherwise. That is why portable toilets are common on jobsites.

There is one more exception. The toilet rule does not apply to mobile crews that have quick transportation to nearby toilet facilities.

How do you count toilets for your crew size?

To count toilets for your crew, start with the number of workers on site at the busiest time. Divide that number by 40 for crews over 20, then round up to a whole number. Each result means one toilet seat and one urinal. A standard porta potty has both a seat and a urinal.

Here are worked examples using Table D-1:

1. 12 workers: 20 or fewer, so 1 toilet is the minimum.
2. 35 workers: 35 divided by 40 rounds up to 1. That is 1 seat and 1 urinal.
3. 60 workers: 60 divided by 40 rounds up to 2. That is 2 seats and 2 urinals.
4. 150 workers: 150 divided by 40 rounds up to 4. That is 4 seats and 4 urinals.
5. 250 workers: 250 divided by 50 is 5. That is 5 seats and 5 urinals.

Count all trades on site, not just your own crew, if you are the one providing the toilets. Ask your general contractor who supplies units for subs.

What are the handwashing rules under 1926.51(f)?

The handwashing rules under 1926.51(f) say employers must provide washing facilities when workers handle paints, coatings, herbicides, insecticides, or other harmful materials. The washing facilities must be close to the work area. The washing facilities must have soap, water, and towels or air dryers.

Many jobsites add a hand-wash station even when the rule does not strictly call for one. Clean hands help crews eat lunch on site without spreading dirt or chemicals. A portable hand-wash station has two foot-pump sinks, soap, and paper towels. See our hand-washing station rental page.

What about farm workers?

Farm worker sanitation falls under a different OSHA rule, 29 CFR 1928.110, the field sanitation standard. The field sanitation standard covers hand-labor farm work with 11 or more workers. The field sanitation standard requires one toilet and one handwashing facility for each 20 workers.

The field sanitation standard also covers drinking water and how close facilities must be to the work. You can read the full text on the eCFR page for 1928.110. Check the rule for your farm type and crew size.

What does OSHA say about keeping toilets clean?

OSHA expects jobsite toilets to be kept sanitary, not just placed on site. A porta potty that is full, out of paper, or broken does not serve the crew. Regular pumping and restocking keep the porta potty usable and help the site pass a safety walk-through.

Weekly service is the usual baseline for a small crew. Bigger crews, long shifts, and summer heat can call for more visits or more units. Keep the service tag inside the door up to date so anyone can see the last cleaning date.

Is the legal minimum enough?

The legal minimum is the floor, not always the best fit for a busy jobsite. The OSHA count assumes the toilets are serviced and kept clean. A crew that is right at the 40-worker line can fill a porta potty fast, especially with long shifts or hot weather.

Long shifts, hot weather, and spread-out sites all call for more units. Our how many porta potties guide covers more cases. See our construction porta potty rental page for jobsite setups.

Do jobsites need accessible units?

Accessible units on jobsites depend on who uses the site, and OSHA's Table D-1 does not set a count for accessible units. Accessibility rules come from other laws. Public events, visitor areas, and some project contracts may call for wheelchair-accessible units.

The U.S. Access Board ADA guide covers rules for toilet rooms and portable units in public settings. Check your contract and local rules. Our wheelchair-accessible porta potty page explains the unit we rent.

Is this legal advice?

This article is not legal advice. This article is a plain summary of OSHA sanitation rules as written in the federal standards. Rules can change, and some states, towns, or contracts add their own requirements. Always check the current rule text and ask a safety professional about your site.

Read the full construction rule on the OSHA 29 CFR 1926.51 page. Read federal rule text on eCFR.

Need units for your jobsite?

Call (603) 956-9127 with your crew size, site address, and start date. We will help you match the OSHA count for your jobsite. Weekly service is included on 28-day rentals, and we can add hand-wash stations or extra visits for bigger crews.