How many porta potties do I need for a jobsite?
Start with OSHA 1926.51(c). It's the baseline every general contractor in Westminster should already know: 1 toilet facility for 20 workers or fewer, 1 toilet seat and 1 urinal per 40 workers once you're between 20 and 200 people, and 1 seat plus 1 urinal per 50 workers at 200 or more. A crew of 15 needs just one unit. A crew of 60 needs two, sometimes three once you account for breaks clustering around lunch. If your trailer or office has running water, that can offset one fixture, but most Westminster sites we serve are running straight portable toilet rental setups with no plumbing at all. For bigger builds, pair the count with a construction site services plan that also covers a dumpster and fencing, since inspectors tend to check all three at once.
How many porta potties do I need for an event?
Events run hotter than jobsites because everyone shows up in a short window instead of trickling in over 8 hours. Use headcount and duration together, not headcount alone.
| Guests | Event length | Units needed |
|---|---|---|
| 50-100 | Up to 4 hours | 2 |
| 100-200 | Up to 4 hours | 3-4 |
| 100-200 | 4-8 hours | 4-6 |
| 200-350 | 4-8 hours | 6-9 |
| 350-500 | 4-8 hours | 9-12 |
Add one unit per 100 guests if you're serving alcohol. Drinking events see roughly double the bathroom traffic of a dry one, so a 150-guest wedding reception with a bar should sit closer to 6 units than 4. Multi-day festivals need service scheduled between days, not just at the end, since ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users over a 40-hour week, well short of what a Saturday-Sunday festival demands. If you're planning something with a beer garden or late crowd, look at festival restroom rental or concert restroom rental pages for setups built around that load.
What if my event serves alcohol?
Bump your count up by roughly 20 to 30 percent over the dry-event table above. Alcohol increases both frequency and duration of visits, and lines form fast once the bar opens. A 200-guest reception with an open bar for 5 hours should run 8 to 9 units instead of the 6 you'd plan for a dry lunch event. Wedding restroom rental planning almost always factors this in, and it's worth adding one ada-accessible-porta-potty to the group regardless of headcount, since ADA Standards 213.2 requires at least 5 percent of clustered single-user units to be accessible, and never fewer than one.
How do I count units for a multi-day job?
Multi-day construction and multi-day festivals both need a service plan, not just a delivery count. A 4-day music festival with 300 daily attenders needs the same 6 to 9 units as a single 8-hour event, but serviced once or twice mid-run instead of once at strike. A 3-week residential job in Westminster with a 6-person crew needs just 1 unit under OSHA 1926.51(c), but it should be serviced weekly at minimum per the ANSI/PSAI Z4.3 baseline interval. Renting by the week instead of by the day usually pencils out cheaper once you pass the 5 or 6 day mark; check the porta potty rental per day numbers against monthly porta potty rental pricing before you commit to a duration.
Worked example: a Westminster jobsite
Say you've got a remodel crew of 18 working a house near the Federal Heights line, about 3.9 miles southeast of central Westminster. Eighteen workers falls under the 20-or-fewer bracket in OSHA 1926.51(c), so one standard unit covers the requirement. Add a handwashing station if the crew is doing exterior paint or coatings work, since OSHA 1926.51(f)(1) specifically requires washing facilities where employees apply paints, coatings, herbicides or insecticides. A handwashing station rental or portable sink rental pairs with the toilet order, and 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at that station, not just sanitizer. Round out the site with a 10 yard dumpster rental for debris, since a 10-yard box answers how many feet is a 10 yard dumpster at about 10 to 12 feet long and holds roughly 1,500 cubic feet, answering how many cubic feet in a 10 yard dumpster question most remodel crews ask, plenty for a single-family remodel.
Worked example: a Westminster wedding
A 150-guest wedding at an outdoor venue with a 5-hour reception and an open bar should plan for 6 to 7 standard units, or step up to 2 to 3 deluxe flushable porta potty units if the couple wants sink and flush features. Add one ADA unit regardless of guest count. If the venue sits toward Broomfield, about 5.6 miles north of Westminster, confirm delivery access early, since porta potty placement guide rules around firm, level ground and truck access matter more on grass venues than on paved lots. A restroom trailer is worth pricing out too: an 8 stall restroom trailer can replace 6 to 8 standard units for a nicer guest experience, though it costs more. Check restroom trailer rental cost against standard unit pricing before deciding.
Does dumpster size change how many units I need?
Not directly, but the two often get ordered together, and mixing them up costs time. A 10-yard dumpster runs about 1,500 cubic feet, a 20-yard about 3,000 cubic feet, and a 20-yard box is roughly 22 feet long. Asked how many tons does a 20 yard dumpster hold, the answer is typically 2 to 3 tons of debris depending on material, while the answer to how many tons can a 30 yard dumpster hold runs closer to 3 to 4 tons, and a 30-yard unit runs about 22 feet long as well, just taller-sided. For how many tons does a 40 yard dumpster hold, figure around 4 to 5 tons, and how many cubic feet in a 40 yard dumpster comes out to roughly 6,000 cubic feet. None of that changes your toilet count under OSHA 1926.51(c), but a bigger dumpster usually signals a bigger crew, which does. Compare 20 yard dumpster rental, 30 yard dumpster rental and 40 yard dumpster rental against your crew size and debris volume together, and check dumpster weight limits before you load anything unusually heavy like concrete or shingles.
What about placement and access once I've picked a count?
Every unit needs a stable, level pad and clear delivery access; the truck typically needs about 60 feet of straight clearance to drop a roll-off, and a similar clear approach helps for restroom trailers. Standard units measure about 44 by 48 inches on the ground and stand roughly 92 inches tall, so plan clearance accordingly on tight residential lots. If you're serving Westminster proper or a nearby town like Northglenn, 7.4 miles northeast, or Wheat Ridge, 11.0 miles south, delivery access changes site to site, so it's worth a quick placement check before delivery day. See the porta potty placement guide and how many porta potties do i need guidance together, and if you're unsure whether the right of way needs a permit, placement in the public right of way needs confirming with the city; we don't have a Westminster-specific rule to cite here, so check with the city before final placement.
How many porta potties do I need for 100 guests?
Plan for 3 to 4 standard units for a 100-guest event running up to 4 hours. Stretch that event to a full 8 hours and you're closer to 4 to 6 units. Add one ADA-accessible unit and bump the count if alcohol's involved.
How many porta potties per person is the real ratio?
There's no single fixed ratio; it depends on hours and alcohol. Roughly one unit per 10 guests for a standard daytime event is a reasonable starting point, tightening to one per 7 or 8 guests if drinks are served.
How many tons does a 30 yard dumpster hold?
A 30-yard dumpster typically holds around 3 to 4 tons, depending on the material. Concrete, shingles and dirt weigh far more per yard than general construction debris, so check dumpster weight limits before loading heavy material.
How many cubic feet are in a 20 yard dumpster?
A 20-yard dumpster holds about 3,000 cubic feet, roughly a box 22 feet long. That's typically enough for a mid-size remodel or a moderate cleanout job in Westminster.
Do I need an ADA unit even for a small event?
Yes, if you're clustering single-user units at all. ADA Standards 213.2 requires at least 5 percent of a cluster to be accessible, and never fewer than one unit, regardless of total guest count.
How many porta potties do I need for a construction crew of 40?
Forty workers crosses into the 20-to-200 bracket under OSHA 1926.51(c), requiring 1 toilet seat and 1 urinal per 40 workers. That's typically 2 combination units, plus a handwashing setup if coatings or chemicals are in use.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.