Before you book, nail down five things: headcount, event or job length, ADA needs, placement surface and service frequency. Miss one and you either overpay or run short on unit day two, and a standard unit alone runs $100 to $350 a day depending on those five variables. This checklist covers all five for St. Louis renters, whether you're planning a backyard wedding or a six-month job site.
Start with worker or guest count, not guesswork. OSHA 1926.51(c) sets the construction baseline: one toilet for 20 or fewer workers, then one toilet seat and one urinal per 40 workers once you pass 20. For events, industry practice under ANSI/PSAI Z4.3 treats one unit per 10 users across a 40-hour week as the standard interval before servicing gets tight. If you're farming labor crews, OSHA 1928.110 calls for one facility per 20 field workers within a quarter mile walk, which matters for larger properties outside the city core. Not sure where your event or crew lands? The how many porta potties do I need guide walks the math step by step, and our OSHA portable toilet requirements page breaks down the ratios by headcount.
A standard porta potty rental runs about 44 by 48 inches on the ground and stands roughly 92 inches tall, with a 60 to 70 gallon holding tank. That footprint fits most driveways and jobsite corners around St. Louis without eating the whole lot. If guests expect more, a deluxe flushable porta potty adds flush mechanisms and a sink, and it's worth it for weddings or corporate events. Federal accessibility rules matter too: ADA Standards 213.2 requires at least 5 percent of clustered units to be accessible, never fewer than one, and an ADA accessible porta potty needs a 60 inch turning circle per ADA Standards 304.3.1 and a 32 inch clear door opening per ADA Standards 404.2.3. For crowds over 150, a restroom trailer rental or a 4 stall restroom trailer handles flow better than scattered singles. Check the ADA restroom requirements page before you finalize a headcount-driven layout.
Placement decides half your headaches. Units need a stable, firm, slip-resistant surface under ADA Standards 302.1, and the accessible route to any unit must stay at least 36 inches wide per ADA Standards 403.5.1. Avoid slopes past a 1:12 ratio near ramps, the same limit ADA Standards 405.2 sets for permanent ramps. If a roll-off dumpster rental is coming to the same site, remember the truck needs about 60 feet of straight clearance behind it to drop or pull the container, so plan toilet placement well clear of that path. Construction sites also need to think about lighting near units after dark, which falls under OSHA 1926.56(a) illumination minimums, and keep the surrounding footprint clear of debris under OSHA 1926.25 housekeeping rules. Placement in the public right of way in St. Louis needs confirming with the city before delivery day; check the porta potty placement guide and porta potty permit requirements pages for what to ask about.
Book at least a week out for standard weekend events, longer for anything over 20 units or a specific delivery window. Pricing shifts hard by duration: a standard unit runs $100 to $350 a day, $130 to $500 a week, and $125 to $325 a month, so a weekend booking that stretches into a week-long rental should always move up, never down, in the quote you're given. Delivery fees separately range $100 to $500 for a single day, dropping to $50 to $150 for a full week when spread across the rental. Here's how the durations stack for a standard unit:
| Duration | Low | Typical | High |
|---|---|---|---|
| Day | $100 | $150 | $350 |
| Weekend | $125 | $250 | $400 |
| Week | $130 | $200 | $500 |
| Month | $125 | $200 | $325 |
For long jobs, the monthly porta potty rental page has the full monthly breakdown, and porta potty rental cost covers what drives the range. Servicing also matters for longer rentals: 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at washing stations, not just sanitizer, so pair your toilets with a handwashing station rental or portable sink rental if your job runs past a few days. Crews near University City, about 7.9 miles northwest of downtown St. Louis, and Webster Groves, 8.6 miles southwest, book through the same checklist regardless of which side of town they're on.
Two to three weeks out is safe for most St. Louis weddings, longer during peak spring and fall dates. A wedding restroom rental or deluxe flushable porta potty often needs a specific delivery window tied to the venue's setup crew, so confirm timing early.
Maybe, depending on where units sit. Placement in the public right of way needs confirming with the city directly; St. Louis Porta Pros can help you figure out what applies. See the porta potty permit requirements page for the questions to ask.
Depends on debris volume. A 10 yard dumpster rental suits small cleanouts; bigger builds need a 20 yard dumpster rental or larger. Check dumpster sizes and dimensions for the comparison.
Every 3 to 5 years for a typical residential tank, driven by tank size and household size. See how often to pump a septic tank for specifics on your situation.
Yes. Weekend rates for a standard unit run $125 to $400, separate from daily or weekly pricing. St. Louis Porta Pros delivers for one-day festivals up through month-long jobsites without changing the checklist above.
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