How many units do you actually need?
Start with headcount and hours, not guesswork. OSHA 1926.51(c) sets the construction baseline: one toilet for 20 or fewer workers, then one toilet and one urinal per 40 workers once you pass 20, scaling to one per 50 at 200-plus workers on site. Farms with hand-labor crews fall under a different rule; OSHA 1928.110 requires one facility per 20 employees within a quarter mile walk, with potable water alongside it. If your event runs food service or paint work, add washing per 29 CFR 1910.141(d)[2], since sanitizer alone does not meet it. Not sure where you land? Run the numbers on how many porta potties do I need before you call, or read the full breakdown on OSHA portable toilet requirements. Saint Charles job sites near the riverfront corridor tend to run tighter fencing setups too, so pair your toilet count with a look at temporary fence rental if the site needs a perimeter.
What unit type fits your job?
A standard porta potty rental covers most construction and yard work: a 60 to 70 gallon holding tank, roughly 44 by 48 inches on the ground, standing about 92 inches tall. For a wedding or a client-facing event, step up to a deluxe flushable porta potty or go straight to a restroom trailer rental if you want sinks and mirrors. ADA Standards section 213.2 requires at least one accessible unit in any cluster, and never fewer than one, so budget for an ADA accessible porta potty on any multi-unit order. That unit needs a 60 inch turning circle under ADA 304.3.1 and a 36 inch clear path under ADA 403.5.1, so check your ground layout before delivery day, not after. Renovation crews doing shorter jobs should compare options on home renovation porta potty, and anyone running a race or fair should look at festival restroom rental or marathon and race restrooms for capacity planning.
Where should the unit go on site?
Clearance matters more than most people expect. A roll-off delivery truck needs about 60 feet of straight clearance behind it, so if you are also ordering a roll-off dumpster rental alongside your toilets, map both drop zones together. Ground has to be stable and firm under ADA 302.1 for any accessible unit, and the access route needs a 32 inch clear door opening per ADA 404.2.3. Saint Charles sites near denser residential blocks often have narrower alley access than sites out toward St. Peters, 6.9 miles west, so measure your gate width before the truck shows up. Full placement rules live on the porta potty placement guide, and if your unit sits anywhere near a public sidewalk, the city needs to confirm right-of-way placement directly. That question is not settled by a blanket rule, so check with Saint Charles before delivery rather than assume. For paint, coatings or pesticide work on the same job, OSHA 1926.51(f)[1] requires washing facilities beyond a portable toilet, so add a handwash unit through handwashing station rental or portable sink rental.
When should you book and confirm pickup?
Lock in delivery timing before you lock in labor. Weekend events fill fastest, and short events run a different price logic than weekly job-site rentals, so check both before you commit. Confirm your service interval too: ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users across a 40 hour week, which is a fine floor for a quiet office trailer site but too thin for a busy festival. If you are running a multi-week job, compare day, week, and month pricing rather than booking day-by-day out of habit.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | -- | -- |
| deluxe | $85-$1200 | $150-$290 | -- |
A weekend rental on a standard unit typically runs $125 to $400, which beats booking three separate day rentals back to back. Full cost detail lives on porta potty rental cost, and if you are staffing a longer build, monthly porta potty rental usually beats renting week to week. Septic-side jobs follow a separate schedule; a typical residential tank gets pumped every 3 to 5 years depending on tank size and household size, so check how often to pump a septic tank if that is part of your property maintenance plan, not just the event.
Before pickup day, walk the checklist one more time: confirmed headcount, correct unit type, ADA unit ordered if needed, clear access route, and a locked service schedule. Saint Charles crews working sites out toward Maryland Heights, 9.4 miles southeast, or Hazelwood, 8.5 miles east, should build in extra lead time on delivery since drive distance affects scheduling windows. For anything outside standard toilets, browse portable restroom rental or the main Porta Potty Rental in Saint Charles, MO hub page for the full service list.
How far in advance should I book?
Five to seven days covers most standard jobs; event weekends and holiday weeks fill faster, so book two to three weeks out if your date falls near a festival or graduation weekend in Saint Charles.
Do I need an ADA unit even for a small event?
Yes, if you are clustering multiple units. ADA Standards 213.2 requires at least one accessible unit per cluster, with a 60 inch turning circle under section 304.3.1, regardless of your total headcount.
Can I place a unit on the street in front of my house?
Maybe. Placement in the public right-of-way needs confirming directly with Saint Charles before delivery; there is no blanket rule to rely on here, so call ahead.
What is the difference between a standard and a deluxe unit?
A standard unit is a 60 to 70 gallon tank on a basic footprint. Deluxe units add flushing and sink features, better suited to weddings, corporate events, or any job facing the public.
How often does the unit get serviced?
ANSI/PSAI Z4.3 sets one visit per week for up to 10 users over 40 hours as the baseline. High-traffic events need more frequent service, so ask about your specific headcount.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.