How many porta potties do I need for a construction site?
OSHA 1926.51(c) sets the real bracket: 1 toilet seat for 20 workers or fewer, then 1 seat and 1 urinal per 40 workers once you cross 20, and 1 seat and 1 urinal per 50 workers once you hit 200 or more. That is a floor, not a comfort number. A 15-person framing crew in Provo needs one standard porta potty rental parked near the trailer. A 60-person crew crosses the 40-worker line twice, so you are looking at 2 units minimum, maybe 3 if the site spans several acres and walking time eats into breaks. Multi-week jobs usually run on monthly porta potty rental pricing rather than day rates, since the math favors it past about 3 weeks. If you are bidding a job and need the ratio spelled out for a permit packet, our OSHA portable toilet requirements page walks through the table line by line. Also budget potable water under 1926.51(a)(1); a jobsite that fails on toilets almost always fails on water too.
How many porta potties do I need for an event?
Events run on headcount and hours, not worker counts, so the math looks different than a jobsite.
| guests | hours | units | notes |
|---|---|---|---|
| 50 | 4 | 2 | baseline daytime event |
| 100 | 4 | 3 | add 1 if alcohol served |
| 150 | 6 | 4 | add 1 per extra 2 hours |
| 300 | 8 | 6 | consider 1 ADA accessible porta potty |
| 500 | 8 | 10 | pair with a restroom trailer rental |
Alcohol service pushes usage up fast; plan an extra unit for every 100 guests once a bar opens. Multi-day festivals need servicing between days, not just more units up front, so check our festival restroom rental guide before you lock a headcount. A backyard wedding restroom rental in Provo with 120 guests over 5 hours lands around 3 to 4 standard units plus one accessible unit if the venue has no permanent ADA restroom nearby.
What does OSHA actually require on a jobsite?
The 1926.51(c) table is the whole rule for construction toilet counts: 1 for 20 or fewer workers, 1 seat and 1 urinal per 40 from 20 up, and 1 seat and 1 urinal per 50 once the crew hits 200. It does not care about job length, only headcount. Separate from toilets, 1926.51(a)(1) requires an adequate supply of potable water on site at all times, and 1926.51(f)(1) requires washing facilities specifically where workers apply paints, coatings, herbicides or insecticides, or handle other harmful contaminants. That last one gets misquoted as a general handwash rule; it is not. A general industry shop in Provo, as opposed to a construction site, falls under 1910.141(c)(1)(i) instead, which uses its own employee-count ratio. Farm crews doing hand labor fall under a third standard, 1928.110, which calls for one facility per 20 workers within a quarter mile walk. If your site mixes trades, a general contractor should default to whichever standard applies to the majority of daily headcount and staff up from there; our construction site services page covers bundling toilets with fencing and a dumpster on one delivery.
Do I need an ADA-accessible unit?
Yes, once you cluster portable toilets, ADA Standards 213.2 requires at least 5 percent of the cluster to be accessible units, with a minimum of one no matter how small the job. An accessible unit needs a 60 inch turning circle inside per section 304.3.1, a 32 inch clear door opening per 404.2.3, and a stable, slip-resistant floor per 302.1. A single porta potty on a small renovation still needs to be reachable; if it is the only unit on site, make it the accessible one. Our ADA restroom requirements page covers reach ranges and door hardware in more detail, and how many porta potties do i need planning for a public event should always include this unit in the base count, not as an add-on afterward.
How does a dumpster factor into the headcount math?
Toilets and dumpsters both scale with people and duration, so it helps to size them together on the same call. A 10 yard dumpster rental holds around 10 cubic yards, roughly 270 cubic feet, and suits a single-room renovation. A 20 yard dumpster rental runs about 540 cubic feet and typically carries 2 to 3 tons depending on material density. Step up to a 30 yard dumpster rental and you are near 810 cubic feet, often rated for 3 to 4 tons on a framing or roofing tear-off. A 40 yard dumpster rental tops out near 1,080 cubic feet and can carry 4 to 5 tons on lighter debris. Match your dumpster size to the same crew count you used for toilets: a 15-person crew clearing debris for two weeks usually pairs one standard toilet with a 20 yard unit. Check dumpster sizes and dimensions before ordering, since delivery trucks need about 60 feet of straight clearance behind the drop point, and confirm dumpster weight limits so you don't order a box that gets you an overage fee.
Should I adjust the count for a multi-day event?
Yes. A single-day count assumes servicing happens once, at the end. Stretch that same event to 3 days and each unit needs at least one mid-event service, sometimes two, based on the ANSI/PSAI Z4.3 baseline of one visit per week for up to 10 users over 40 hours; a high-traffic weekend event blows past that baseline fast. A county fair running Thursday through Sunday in Provo should plan servicing after day 2, not wait until teardown. Add 1 unit per 100 guests for each additional day past the first if you are not able to service more often. Our county fair restrooms and concert restroom rental pages both break this down by day count, and a marathon and race restrooms plan needs a different curve entirely since the crowd is moving, not seated.
What's a worked example I can copy?
Take a 250-person outdoor wedding in Provo running 6 hours with a full bar. Start at the 150-guest baseline of 4 units, add 1 for the extra 100 guests, then add 1 more for alcohol service; that lands at 6 standard units. Add one ADA unit per the 5 percent rule, bringing the total to 7. If the venue has no water hookup, add a handwashing station rental near the food line, since 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at any handwash point, not sanitizer alone. Budget delivery and pickup as separate line items; check porta potty rental cost for how delivery fees stack against the unit rate before you finalize a headcount-based order.
Pricing by unit and duration
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $200-$240 | - |
| deluxe | $85-$1200 | $150-$290 | - |
A weekend rental on a standard unit typically runs $125 to $400, which fits a Saturday event better than a full week's rate. For jobsite runs longer than a month, compare against porta potty rental per day pricing to see where the crossover point sits for your crew size.
How many porta potties do I need for 100 people?
Plan for 3 units over 4 hours, per the 1-per-50-guests-per-4-hours baseline. Add a fourth if alcohol is served or the event runs past 5 hours. A 100-guest backyard party in Provo with no bar usually gets by on 3 standard units plus a handwash station near the food table.
How many porta potties per person on a construction site?
OSHA 1926.51(c) sets 1 unit per 20 workers up to 20, then 1 seat and urinal per 40 from there. A 45-person crew needs 2 units minimum. Crews spread across a large lot in Provo sometimes add a third for walking distance, not headcount.
How many tons does a 30 yard dumpster hold?
A 30 yard dumpster typically carries 3 to 4 tons, depending on material density; concrete and shingles fill the weight limit long before the box looks full. Check dumpster weight limits before loading debris that dense.
How many cubic feet are in a 20 yard dumpster?
A 20 yard dumpster holds about 540 cubic feet of debris. That is roughly double a 10 yard box, which runs about 270 cubic feet, so match the size to your actual haul rather than guessing.
How many tons does a 40 yard dumpster hold?
A 40 yard dumpster typically holds 4 to 5 tons on lighter debris, though dense material like concrete will hit the weight limit well before the box fills up. It also holds about 1,080 cubic feet by volume, which is why light bulky debris like furniture fits better here than dense material does.
How many cubic feet are in a 10 yard dumpster?
A 10 yard dumpster holds about 270 cubic feet, which is enough for a single-room renovation or a small cleanout. It measures out to roughly 12 feet long on most standard boxes, so check clearance before delivery.
How many tons does a 20 yard dumpster hold?
A 20 yard dumpster typically carries 2 to 3 tons depending on material density, and it holds about 540 cubic feet by volume. That combination works well for a kitchen remodel or a mid-size cleanout.
Do I need more units for a multi-day festival?
Yes. Plan on servicing partway through instead of only at teardown, based on the weekly service baseline in ANSI/PSAI Z4.3. A 3-day fair in Provo should schedule a mid-event pump-out, not wait for the final day.
Can I combine toilets and a dumpster on one order?
Yes, most Provo Porta Pros jobsite deliveries bundle both, along with temporary fence rental if the lot needs a perimeter. Ordering together usually simplifies delivery scheduling since both trucks need similar site access and clearance.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.