OSHA 29 CFR 1926.51 requires toilets on construction sites: one for a crew of 20 or fewer, with more as the headcount grows under the standard's table, and handwashing available. The site manager confirms what a job requires. A provider supplies, services and removes the units but does not certify compliance.
Key takeaways
- OSHA's construction sanitation rule, 29 CFR 1926.51, sets one toilet for a crew of 20 or fewer and adds toilets as the headcount grows, using a table in the standard.
- Handwashing facilities are expected near the toilets, which is why a handwash station is usually ordered with the first unit on a job site.
- Count the peak crew, including subcontractors, not the average, and recheck the number whenever the headcount changes.
- Servicing frequency is agreed with the provider, and heat, dust and crew size all raise it; the site manager checks the units daily.
- This site cannot say that any unit meets a code; the site manager or general contractor confirms what the job requires.
What does OSHA require on a construction site?
OSHA 29 CFR 1926.51 requires toilets for construction workers: one for a crew of 20 or fewer, and more as the headcount grows under a table in the standard. It also expects handwashing near the toilets. The standard sets a minimum, and the site manager confirms what the job needs.
The rule is aimed at employers, not at providers. It is the contractor's job to supply the facilities and to keep them usable, and the provider is the supplier. A unit on a site does not by itself prove compliance, and this site does not say that any unit meets a code.
Federal OSHA covers most private construction in Texas. If your job has a public owner or a lender with its own sanitation terms, they may add to it. Read the contract and ask the owner.
The standard's text is available from OSHA, and the site manager should read it rather than rely on a summary. This guide gives the first step, one toilet for a crew of 20 or fewer, and explains how the number grows. It does not reproduce the table, because the table is the regulator's to state and the contractor's to apply.
How many units does your crew need?
Count the largest number of workers on site at once, including subcontractors, then read the number off the standard's table with the site manager. A crew of 20 or fewer needs one unit. Larger crews need more, and the table below shows a cautious way to plan. Round up, and add margin in hot weather.
Use the peak. The day the concrete is poured, the day the framers and the electricians overlap and the day inspectors visit are the days the units are tested. A count based on average days will leave queues on the busiest ones.
The table below is a planning habit, not the OSHA table: it starts from about one unit per 20 workers, which is a cautious figure this site offers for planning. The site manager reads the actual requirement from the standard.
On a multi-employer site, each employer has responsibilities, and the general contractor often provides the facilities for everyone. Agree who supplies what at the start, so that no one assumes another trade has handled it. A quick line in the subcontractor agreement saves an argument later.
Ask the provider to tell you the count it would recommend for your crew, and then check that number against the standard yourself. If the two differ, ask why. A provider that works many job sites has seen what crews of different sizes actually need, and its advice is usually a useful cross-check on the table.
| Peak crew on site | Planning starting point | Planning note |
|---|---|---|
| Up to 20 | 1 unit (the OSHA minimum) | One unit may still be crowded in heat |
| 21 to 40 | 2 units | Add a handwash station |
| 60 | 3 units | Check again when subcontractors arrive |
| 100 | 5 units | Plan more than one bank on a spread-out site |
| 200 | 10 units | Confirm the requirement with the site manager |
| 300 or more | 15 units, then review | The standard's table changes with the headcount, so read it before you finalise |
What about handwashing?
OSHA expects handwashing facilities near construction toilets. On a site with no tap, a freestanding handwash station with a clean-water tank, a pump, soap and towels is the usual answer. Put it close enough to the toilets that using it is easier than skipping it.
Size the tank to the crew. A small tank empties quickly at lunch. Ask the provider how long the tank lasts at your headcount and how often it will refill and empty it.
Dust gets into pumps and onto towels, so ask about cleaning. The handwash station page explains what to ask for, and the supplies page covers soap and towels.
Positioning the handwash station matters as much as the tank size. A station at the far end of the site, or out of sight of the toilets, will not be used. Put it where workers walk after using the toilet and before they go to the break area. Add a second station at the break area on large sites.
How often should units be serviced?
The schedule is agreed with the provider and written into the quote. A small crew may need a weekly visit. A large crew, hot weather or dusty ground needs more. Texas regulates the hauling of the waste, and the provider handles it under those rules; you never empty a unit.
Heat raises use. Press reports put an ordinary year at roughly 20 days of 100 F or hotter at DFW Airport, and workers on a bare slab drink more and use the toilets more often. Ask the provider about extra visits in summer.
A site manager can check units each morning: door, latch, paper, sanitiser, smell and tank level. Report problems at once and keep a short log of what you find and when you called. The servicing page explains a visit.
Dust and heat both hit a cabin hard. Dust gets into latches and onto seats, and heat raises the temperature inside. Ask the provider for a daily clean-up of the door area if the site is very dusty, and for shade over units in summer where it is possible.
If a unit is knocked over, vandalised or left full, report it the same day. A unit out of service shrinks the count below the minimum, which matters on the busiest days. Ask the provider what it does to replace a unit and how it handles reports made at the end of the week.
- Daily check by site staff
- Extra visits in hot weather
- Report faults at once
- Keep a short log
Where should units stand on a Dallas County site?
Near the site entrance, on firm, level ground, away from active work and reachable by a service truck. Avoid low spots where water collects, haul roads and areas about to be excavated. On large sites, several banks near the work serve crews better than one bank at the gate.
Dallas County clay holds water after heavy rain, and a unit on a low patch can stand in mud. Ask the grading crew where water will run before you choose the spot.
As the job moves, units may need to move. Only the provider moves them. Tell it where and when, and ask what it needs from you. The delivery page covers access.
If a site has an active excavation, ask the surveyor or the foreman where the trench lines and utilities run. A unit placed over a future trench has to be moved, and each move is a truck visit. Mark the unit locations on the site plan at the start.
What should the site manager keep on file?
Keep the provider's quote, the unit list, the delivery date, the servicing schedule and a note of peak headcount. If an inspector, owner or lender asks about sanitation, you can show them. Update the file when the crew or the number of units changes.
A one-page record with the date, the peak crew and the number of units is enough. It also reminds you to recheck the count when the crew grows.
If a unit is damaged, take a photo and send it to the provider, and note when you called.
Owners and lenders sometimes ask for evidence of sanitation arrangements before they release a payment or sign off on a stage. A folder with the quote, the unit list and the servicing log answers the question in a minute. Without it, the same question can stop the site while someone calls the provider to ask for a copy.
What changes on long and large builds?
Long builds need a servicing routine and a periodic review of the count. Large builds need several banks and a handwash station at each. The long-term rental page and the warehouse page explain both.
As a building takes shape, the crew changes. Review the number of units at each phase. When the building gets its own plumbing, tell the provider the date so it can collect the units.
Keep the approach for the service truck clear. A unit that cannot be reached is a unit that cannot be serviced.
How do Dallas County conditions affect a job site?
Dallas County sites meet heat, dust and heavy clay. Summer brings roughly 20 days at 100 F or hotter in a typical year at DFW Airport, spring storms soften ground, and open sites in the south of the county have little shade. Each affects where units stand and how often they need service.
Heat raises use and strengthens odours, so ask the provider about extra visits in summer and about shade. Dust affects handwash pumps and towels, so ask about cleaning. Wet clay affects the truck route, so ask where water collects and keep the approach clear.
Large builds in the south of the county, such as logistics and warehouse sites, run for months and cross seasons. The warehouse page and the heat guide explain what to plan for in each.
- Plan for summer heat
- Keep the truck route dry
- Keep handwash pumps clean
- Review as the seasons change
Frequently asked questions
Is a handwash station required?
OSHA expects handwashing facilities near construction toilets. A freestanding station is the usual way to provide it where no tap is close. The site manager confirms what the job requires.
Do subcontractors count toward the ratio?
Yes. Count everyone who will be on site on the busiest day. If subcontractors bring their own units, tell your provider so the total matches the headcount.
What if the crew grows a lot?
The number of toilets OSHA expects rises with the headcount, so recheck the count and the layout. Ask the provider about adding units and banks.
Does this guide say my units meet OSHA?
No. It summarizes the ratio. The site manager or general contractor confirms what the job requires, and a provider supplies units but does not certify compliance.
Who empties the units?
The provider does, under Texas rules for hauling portable-toilet waste. You should never empty, move or repair a unit yourself.
Sources
This guide is general information for Dallas County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.