How many porta potties do I need for OSHA compliance?
Start with the headcount, not a guess. OSHA 1926.51(c)(1) sets the baseline: 1 unit per 20 workers, then a toilet seat and urinal added per 40 workers as your crew grows past that, and per 50 once you reach 200 workers on site. A 15-person framing crew in Great Falls needs one standard unit. A 60-person crew needs at least two, sometimes three depending on shift overlap. Our how many porta potties do I need guide walks through the math for mixed trades and multi-shift jobs. Service frequency matters 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 busy site needs more frequent pumping, not just more units. If you're bidding a job near Malmstrom AFB, 5.9 miles east of downtown, factor drive time into your delivery window. We deliver standard porta potty rental units across Great Falls and out to job sites in Black Eagle, 3.9 miles northeast, and Gibson Flats, 5.4 miles southeast.
What does OSHA require for handwashing on a job site?
Plain potable water is the OSHA floor for every job site under 1926.51(a)(1). That's separate from a specific handwashing mandate tied to hazardous work. OSHA 1926.51(f)(1) requires washing facilities specifically where employees apply paints, coatings, herbicides or insecticides, or work with other contaminants that could land on skin. If your crew is spraying stain on fence posts or applying herbicide along a right-of-way, that trigger applies and a plain toilet setup isn't enough. Pair your portable toilet rental with a handwashing station rental to cover it. Under 29 CFR 1910.141(d)(2), washing facilities need soap and towels or a hand-drying device. Hand sanitizer alone doesn't satisfy that standard, general industry or construction. Our handwashing requirements page breaks down which trigger applies to your crew, and our portable sink rental units come stocked with both soap and paper towel dispensers, ready for delivery anywhere in Great Falls.
Does Cal OSHA change the requirements for jobs outside California?
No. Cal OSHA rules apply only to work performed in California, so a Great Falls project follows federal OSHA 1926.51(c)(1) for toilet ratios, not Cal OSHA's separate general industry standard. Contractors who've worked jobs in both states sometimes ask about "cal osha portable toilet requirements construction" out of habit, but Montana sites answer to federal OSHA. That said, the underlying logic is similar: headcount drives unit count, and site duration drives service frequency. If your crew works agricultural land near Sand Coulee, 13.5 miles southeast, and does hand-labor tasks like planting or harvesting, OSHA 1928.110 applies instead. That rule requires potable water, toilets and handwashing at one facility per 20 employees, and the facility has to sit within a quarter mile walk of the work area. Our farm and agricultural restrooms page covers placement for ag sites specifically. For general construction compliance, our OSHA portable toilet requirements guidance and construction site services page cover delivery logistics for crews of any size.
Where can I place porta potties to stay OSHA and ADA compliant?
Placement matters as much as count. OSHA doesn't set a hard distance rule for toilet placement on general construction sites, but ADA Standards 213.2 requires at least 5 percent of clustered single-user units to be accessible, and never fewer than one. That means a Great Falls job site with six or eight units needs at least one ADA accessible porta potty in the group. Accessible units need a 60 inch turning circle under ADA Standards 304.3.1 and a 36 inch clear path under 403.5.1, so don't tuck the accessible unit behind a stack of lumber or a dumpster. Ground surfaces need to be stable and slip resistant per ADA Standards 302.1, which rules out placing units on loose gravel or soft mud without a pad underneath. Check our porta potty placement guide before your delivery lands. If you're setting up near the public right-of-way anywhere in Great Falls, placement there needs confirming with the city before drop-off; we don't guess at that one. Our porta potty permit requirements page has more on what to check before delivery day.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $240-$400 | - |
| deluxe | $85-$1200 | $150-$290 | - |
Pricing depends on unit type and job length, and our porta potty rental cost and porta potty rental per day pages break it down further. For long jobs, monthly porta potty rental usually runs cheaper per day than a short-term rental.
Do I need a separate unit for each trade on a mixed job site?
No, OSHA counts total workers on site, not workers per trade. A 30-person site with five different subcontractors still needs units sized to 30 people total under 1926.51(c)(1), not five separate counts. Coordinate with your general contractor on shared placement.
How many toilets does OSHA require for a 45 person crew?
A 45-person crew needs at least two units under 1926.51(c)(1): one for the first 20 workers, plus a toilet seat and urinal for the next 25. Round up when your count sits near a threshold, since undercounting risks a citation mid-job.
Are storage containers or fencing part of an OSHA site plan?
They're not toilet-specific, but housekeeping standards under 1926.25 require clearing debris from work areas, and secure storage helps with that. Pair a storage container rental or temporary fence rental with your sanitation setup for a cleaner, more compliant site.
Does OSHA require handwashing stations at every job site?
Only where 1926.51(f)(1) applies: paint, coatings, herbicides, insecticides or similar contaminants. Every site still needs potable water under 1926.51(a)(1). When in doubt, add a handwashing station anyway; it's cheap insurance against a citation.
What happens if my Great Falls site fails an OSHA toilet ratio check?
Inspectors can cite the ratio violation and require immediate correction, sometimes halting work until units arrive. Keep your headcount current and call ahead; most Great Falls deliveries can turn around fast once you know your worker count.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.