How many porta potties do I need for a jobsite?
Start with your crew count and let OSHA do the math. Under OSHA 1926.51(c), a jobsite with 20 workers or fewer needs one toilet facility. From 20 up to 200 workers, the rule steps to one toilet seat and one urinal per 40 workers. At 200 or more, it drops to one seat and one urinal per 50 workers. A framing crew of 15 in Fair Haven needs one unit. A 60 person crew building out a warehouse near the harbor needs two units minimum, more if your super wants a buffer for breakdowns. Most New Haven contractors we work with order a standard porta potty rental for the base count and add a deluxe flushable porta potty for foremen and office trailers. If painters or anyone applying coatings or insecticides is on site, 1926.51(f)(1) requires washing facilities beyond a standard unit. Check our construction site services page for a fuller build-out, and see dumpster permit requirements if you are also ordering a roll-off.
OSHA jobsite table by crew size
| Workers | Toilets required | Typical order |
|---|---|---|
| 1 to 20 | 1 toilet facility | 1 standard unit |
| 20 to 40 | 1 seat + 1 urinal | 2 standard units |
| 40 to 80 | 2 seats + 2 urinals | 3 to 4 standard units |
| 80 to 160 | 4 seats + 4 urinals | 5 to 6 standard units |
| 200+ | 1 per 50 workers | scales with headcount |
This table follows OSHA 1926.51(c)(1) directly. It is written for construction sites. If your crew works in a fixed workplace rather than a jobsite, general industry uses 1910.141(c)(1)(i) instead, a different ratio table entirely. Agricultural crews doing hand labor fall under 1928.110, which calls for one facility per 20 workers within a quarter mile walk, plus potable water under 1926.51(a)(1). If your project mixes farm labor and construction trades, staff the higher of the two counts rather than guessing.
How many porta potties for an event?
Plan for one standard unit per 50 guests over a 4 hour event, then adjust up for alcohol, heat or a longer day. A wedding at 150 guests for 5 hours wants at least three standard units, plus one ADA accessible porta potty under ADA 213.2, which requires at least one accessible unit whenever units are clustered, five percent minimum. Add a second ADA unit past roughly 300 guests. Alcohol pushes usage up fast; treat a beer garden or open bar event like it has 25 percent more guests than the guest list says. A New Haven fall festival at 800 attendees for 8 hours, serving beer, should book closer to 20 standard units than the flat 16 the base ratio suggests. See our festival restroom rental and event restroom rental pages for setup notes, and wedding restroom rental if you want a nicer unit for photos.
Event table by headcount and hours
| Guests | 4 hours | 8 hours | With alcohol (4 hrs) |
|---|---|---|---|
| 100 | 2 units | 3 units | 3 units |
| 250 | 5 units | 6 units | 6 to 7 units |
| 500 | 10 units | 12 units | 13 units |
| 1000 | 20 units | 24 units | 25 units |
Multi-day events do not need extra units, but they do need more service visits. ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users across a 40 hour week; a 3 day festival at 500 guests a day blows past that baseline fast and needs daily pumping, not weekly. Standard unit day rates run in the $100 to $350 band and event rates commonly land between $200 and $800 per unit depending on duration and service frequency, so build service into your budget from day one, not as an afterthought. Full pricing detail lives on porta potty rental cost.
How many tons does a 20, 30 or 40 yard dumpster hold?
A 20 yard dumpster is roughly 22 feet long and holds about 2 to 3 tons of mixed debris, a 30 yard runs about 4 tons, and a 40 yard tops out near 4 to 5 tons depending on the material. Weight varies a lot with what you throw in; shingles and concrete fill the tonnage fast while lumber and drywall fill the cubic footage first. A 10 yard dumpster rental is about 12 feet long and holds around 400 cubic feet, useful for a single bathroom gut job. A 20 yard dumpster rental holds close to 800 cubic feet, and a 30 yard dumpster rental runs around 1,200 cubic feet. Step up to a 40 yard dumpster rental and you are near 1,600 cubic feet, sized for a full renovation or a small commercial strip-out. Check exact footprints on dumpster sizes and dimensions before you order, since a roll-off delivery needs about 60 feet of straight clearance behind the truck to swing in. Weekly dumpster rates run $426 to $778 depending on size and hauler, and dumpster weight limits explain the overage fees that hit when a load runs heavier than its rated tonnage.
Do I need an ADA unit and how many?
Yes, if you are clustering portable toilets for a public event, staff or festival grounds. ADA Standards 213.2 requires at least five percent of clustered single-user units to be accessible, and never fewer than one. That single unit also has to meet its own specs: ADA 403.5.1 calls for a 36 inch clear route to the door, ADA 404.2.3 sets a 32 inch minimum door opening, and ADA 304.3.1 requires a 60 inch turning circle inside. A downtown New Haven street festival with 12 standard units on site needs at least one ADA unit under that ratio; a stadium event with 40 units needs two. ADA day rates run $200 to $400, noticeably higher than a standard unit, because the footprint and hardware cost more to build and move. Weekly ADA rentals run $120 to $240, often cheaper per day than a short daily order if your event spans several days. Order early since ADA inventory is thinner than standard stock across most New Haven vendors.
How does a multi-day rental change the count?
It usually does not change the unit count, but it changes the service plan. A 3 day corporate event at the same headcount as a single afternoon still needs the same number of units calculated from the tables above; what changes is how often each one gets pumped and restocked. 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at wash stations, not just sanitizer, and that supply chain needs restocking daily on a multi-day run, not weekly. Weekend rentals in our price bands run $125 to $400 for standard units, distinct from the daily and weekly bands, so a 3 day festival often prices out as a weekend rate rather than three separate day rates. If your event runs into evening hours, check OSHA 1926.56(a) for area lighting if workers are servicing units after dark, and consider a handwashing station rental alongside your toilet count for food vendor compliance.
What is a worked example for a jobsite and an event?
Take a 45 person residential crew working in Hamden, 7.0 miles north of New Haven. Under OSHA 1926.51(c), that crew sits in the 40 to 80 worker bracket, so two seats and two urinals, typically ordered as three to four standard units with weekly service. Compare that to a county fair in West Haven, 4.3 miles southwest of New Haven, drawing 600 people over 6 hours with a beer tent. Base ratio calls for 12 units; alcohol pushes that to roughly 15, plus one ADA unit under the five percent rule. Both jobs get quoted differently: the jobsite runs a weekly rate, the fair runs an event day rate. Request a firm number through request a quote rather than guessing from a table alone, since site access and multi-day service change the final count. See service areas for coverage details, or browse porta potty rental in New Haven for local specifics.
How many porta potties do I need per 100 guests?
Plan on two standard units per 100 guests for a 4 hour event, rising to three if alcohol is served or the event runs past 6 hours. Add one ADA unit once your cluster passes 20 units total, per ADA 213.2's five percent rule.
How many porta potties for a 20 person crew?
One toilet facility covers a crew of 20 or fewer under OSHA 1926.51(c)(1). Most New Haven contractors still order a second unit as a buffer against pump truck delays or a broken lock, especially on longer jobs.
How many cubic feet in a 10 yard dumpster?
A 10 yard dumpster holds about 400 cubic feet, roughly matching a garage cleanout or single bathroom remodel. It runs about 12 feet long, short enough for driveways with tight turning room.
How many tons can a 30 yard dumpster hold?
A 30 yard dumpster typically holds around 4 tons of mixed construction debris. Heavier material like shingles or concrete fills the weight limit well before the cubic footage does, so check your hauler's tonnage cap first.
Does alcohol really change my porta potty count?
Yes. Alcohol increases restroom trips and slows turnover at each unit, so treat an event serving alcohol like it has about 25 percent more guests than the actual headcount when sizing your order.
Should I order extra units for a multi-day rental?
Usually not extra units, but definitely extra service visits. A multi-day event needs daily pumping and restocking rather than the weekly baseline set by ANSI/PSAI Z4.3, so budget service frequency separately from unit count.
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