What Does OSHA 1926.51(c) Actually Require?
The rule is a straight ratio table. Crews of 20 or fewer need 1 toilet seat, full stop. Once you cross 20 workers, OSHA 1926.51(c)(1) calls for 1 toilet seat and 1 urinal per 40 workers, and that ratio shifts to 1 per 50 once the crew hits 200. There's a separate rule for potable water too: 1926.51(a)(1) requires an adequate supply on every site, regardless of crew size, and a portable sink rental or handwashing station rental can cover that alongside your toilets. Most Davenport contractors we work with round up rather than down, because a sub-count on a Friday afternoon site walk is a bad time to discover you're short. If you're not sure how your headcount lands, our guide to how many porta potties you need breaks the math down by crew size and shift length. For most residential jobs around Davenport, a single standard portable toilet covers the crew through the whole build, and a porta potty placement guide will save you a callback for site access issues later, and our porta potty rental checklist covers the rest of the setup.
Note that Cal OSHA runs a similar but not identical standard for California job sites, so a Cal OSHA portable toilet requirements construction ratio isn't the one governing anything here in Iowa. Davenport contractors follow the federal 1926.51(c) table, whether you're renting a porta john for a small crew or a full portable restroom rental fleet for a large one.
How Many Porta Potties Do I Need for OSHA Compliance?
Take your peak headcount on the busiest single day, not your average crew size, and run it against the 1926.51(c) ratio. A 15-person framing crew needs one unit. A 45-person crew crosses into the urinal-per-40 tier, which usually means two full-size units plus a urinal-only fixture, or three standard units if you'd rather simplify service logistics, an option worth pricing against a deluxe flushable porta potty if your crew wants better fixtures. Multi-trade sites in Davenport often stack subs on the same days, so the real number can run higher than the general contractor's roster suggests. Request a quote with your actual peak-day count and we'll size it correctly the first time, or check our FAQ if you want to sanity-check the math yourself first. If your project also needs an ADA-accessible unit, ADA Standards section 213.2 requires at least 5 percent of a clustered bank to be accessible, with a minimum of one unit regardless of cluster size.
Rental duration matters for budgeting too. A standard unit runs in the 100 to 350 dollar range per day depending on service frequency, 130 to 500 dollars per week, and 125 to 325 dollars per month for longer jobs. Compare those bands on our porta potty rental cost page before you commit to a term, and see porta potty rental per day or monthly porta potty rental pricing for the exact duration you need.
| Duration | Low | Typical | High |
|---|---|---|---|
| Day | $100 | $150 | $350 |
| Week | $130 | $200 | $500 |
| Month | $125 | $200 | $325 |
Are There OSHA Portable Toilet Distance Requirements?
OSHA's construction standard doesn't set a hard distance number the way some agricultural rules do. Field sanitation under 1928.110 requires toilets within a quarter mile walk for hand-labor ag workers, but that's a farm labor rule, not a construction one. For jobsites, the practical guidance is placement that doesn't force workers to cross active traffic lanes, excavation, or material staging to reach the unit. A porta potty placement guide matters more on tight urban lots, and Davenport sites near downtown or riverfront work often have limited placement options because of sidewalk and right-of-way constraints. If a unit needs to sit in the public right of way, that placement needs confirming with the City of Davenport before delivery, since we don't have a published local ordinance number to cite here; our porta potty permit requirements page covers what to ask the city. A roll-off delivery truck needs about 60 feet of straight clearance behind it, which matters if you're staging a dumpster alongside the toilets on the same access route.
Do OSHA Rules Cover Handwashing, Not Just Toilets?
Yes, but only in specific contexts. OSHA 1926.51(f)(1) requires washing facilities where workers apply paints, coatings, herbicides or insecticides, or handle other harmful contaminants. It is not a blanket handwashing mandate for every construction task. General industry sites fall under 1910.141(c)(1)(i) for toilet ratios instead of the construction table, and 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at washing stations. Hand sanitizer alone doesn't satisfy that rule. A handwashing station rental or portable sink rental covers painting crews and food-adjacent work sites. Full requirement details live on our handwashing requirements page, and a hand sanitizer station rental can supplement but not replace soap-and-towel washing under the rule. Crews working near the Rock Island Arsenal, about 6.1 miles southeast of Davenport, often need documentation ready for federal site access, so keeping your washing station compliant matters more there than on a typical residential job.
Frequently asked questions
How many workers before I need a second porta potty?
Once your peak-day headcount passes 20, OSHA 1926.51(c)(1) adds a urinal per 40 workers. Most contractors add a second full unit at that point rather than a urinal-only fixture, since it simplifies servicing and covers ADA needs too.
Does Davenport require a permit for portable toilet placement?
Permit rules vary by placement and lot type, and we don't have a confirmed municipal code to cite here. Check with the City of Davenport before placing a unit in a right-of-way, driveway apron, or sidewalk easement.
What's the difference between OSHA and Cal OSHA toilet rules?
Cal OSHA's portable toilet requirements construction standard applies only in California and includes some differences from the federal table. Davenport sites follow 1926.51(c) exclusively, so Cal OSHA specifics don't apply here.
Can one ADA unit cover my whole site?
Usually yes for smaller sites. ADA Standards 213.2 requires at least one accessible unit in any cluster, and 5 percent of a larger cluster. See our ADA restroom requirements page for cluster sizing.
How far is Davenport from Bettendorf for delivery?
Bettendorf sits about 7.9 miles east of Davenport. We service both cities along with Rock Island and Moline on regular delivery routes.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.