How many units do I actually need?
Start with headcount and duration, not guesswork. OSHA 1926.51(c) sets the baseline for construction crews: 1 toilet for 20 workers or fewer, then 1 toilet seat and 1 urinal per 40 workers once you pass 20, and per 50 once you hit 200 or more. A residential remodel in Napa with a four-person crew needs one standard porta potty rental for the job. A vineyard harvest crew falls under different rules: OSHA 1928.110 covers agricultural field sanitation and calls for one facility per 20 hand-labor employees, reachable within a quarter mile walk, which matters if your crew is spread across rows. Events run on headcount and hours, not labor law, so check the how many porta potties do I need guide before you order. If your project has both women and men on site for more than a shift, plan for that in your count and read the OSHA portable toilet requirements page for the full breakdown.
What has to be true about the ground before delivery?
Flat, firm, and clear. ADA Standards 302.1 calls for stable, firm, slip-resistant surfaces, and that is good practice even where ADA units are not required. A standard unit runs about 44 by 48 inches on the ground and stands roughly 92 inches tall, so give the delivery crew room to set it without scraping a fence or a parked car. If you are adding a restroom trailer rental instead, plan for a level pad and nearby power, since trailers need more than a gravel patch. Roll-off placement has its own clearance rule: a delivery truck needs about 60 feet of straight clearance behind it to drop a container, which matters on tighter Napa lots near downtown. Check the porta potty placement guide before delivery day, and if you are unsure whether the spot sits in a public right of way, that placement needs confirming with the City of Napa before the truck shows up.
Do I need an ADA unit on my checklist?
Yes, if units are clustered for public use. ADA Standards 213.2 requires that at least 5 percent of clustered single-user units be accessible, with a minimum of one, and that accessible unit needs a 60 inch turning circle inside per ADA 304.3.1 and a clear door opening of at least 32 inches under ADA 404.2.3. A wedding at a Napa vineyard with six standard units needs at least one ADA accessible porta potty mixed in. Route width matters too: ADA 403.5.1 sets a 36 inch minimum clear path, so mind any gravel or slope between the parking area and the unit. Pair that with a handwashing station rental nearby, since 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at washing stations, and hand sanitizer alone does not satisfy that rule. If your crew works with paints or coatings, OSHA 1926.51(f)(1) requires washing facilities specifically for that contaminant exposure, separate from general toilet counts.
When should I book and what else goes on the list?
Book delivery 3 to 5 business days ahead for standard jobs, sooner for weekend events, since Napa fills up fast during harvest season. Add servicing frequency to your checklist too: ANSI/PSAI Z4.3 sets a baseline of one service visit per week for up to 10 users over a 40 hour week, so a longer job or bigger crew needs a tighter schedule. Confirm your unit's tank size, typically 60 to 70 gallons on a standard model, against your headcount and event length so you are not scheduling an emergency pump-out. If the job involves food service, a nearby grease trap pumping check is worth adding, since a grease interceptor gets pumped once fats, oils, grease and solids reach 25 percent of liquid depth. Round out the list with a temporary fence rental if the site needs a barrier, and a light tower rental for early or late shifts. For multi-week jobs, compare day, week, and month rates before you commit:
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $240-$400 | - |
| deluxe | $85-$1,200 | $150-$290 | - |
Delivery fees run separately, typically $100 to $150 for a single day and $50 to $150 for a week-long placement. Full pricing detail lives on the porta potty rental cost page and the monthly porta potty rental page if your job runs long.
What size crew needs more than one unit?
Past 20 workers on a construction site, OSHA 1926.51(c) requires a second toilet seat and urinal per 40 additional workers. A crew of 25 to 60 in Napa needs two to three units minimum, plus a wash station. Check the construction site services page for a full jobsite setup list.
Do I need a permit for placement on my Napa property?
Placement in the public right of way needs confirming with the City of Napa; that rule is not something to guess at. On private property, most placements do not require a separate permit, but confirm before delivery. See the porta potty permit requirements page for what to ask.
How often do units get serviced during a multi-week rental?
Weekly is standard under the ANSI/PSAI Z4.3 baseline for up to 10 users across a 40 hour week. Higher-traffic events or larger crews need twice-weekly service. Check the how often are porta potties cleaned page to match frequency to headcount.
What is the difference between a standard and deluxe unit on my checklist?
A standard unit is a basic single-stall toilet with a 60 to 70 gallon tank. A deluxe unit adds features like a flushing mechanism and a sink. Compare both on the deluxe flushable porta potty page before finalizing your order.
Should I add a holding tank to my checklist for a remote Napa site?
Yes, if there is no septic or sewer access nearby. A holding tank rental covers wastewater for sites without hookups, and pairs well with a standalone restroom or trailer setup for remote vineyard or agricultural sites.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.