OSHA requires 1 toilet for every 20 workers on a job site with 20 or fewer people, per 1926.51(c). Above that, ratios shift with crew size. Spokane Valley contractors renting from Spokane Valley Porta Pros need to match units to peak headcount, not average headcount, to stay compliant.
The ratio comes straight from 1926.51(c): 1 toilet seat for 20 workers or fewer, then 1 toilet seat and 1 urinal per 40 workers as you climb past 20, and 1 seat and 1 urinal per 50 once you hit 200 or more. That is a construction standard. If your crew works in a fixed shop or warehouse instead of a jobsite, general industry rules under 1910.141(c)(1)(i) apply instead, with a different table. Most Spokane Valley builders land in the first tier. A single-family remodel crew of 8 needs one unit. A framing crew of 35 needs two, plus a urinal. Use our how many porta potties do I need guide to run your own numbers before you call, and check standard porta potty rental specs so you know what a unit actually holds. Agricultural crews fall under a separate rule, 1928.110, which sets one facility per 20 hand-labor employees within a quarter mile walk. That distance rule matters on spread-out farm sites east toward Liberty Lake, 7.0 miles from Spokane Valley, where a single unit at the property entrance will not cut it.
OSHA does not publish a fixed foot-distance from a workstation to a toilet, so the honest answer is that it is not spelled out in 1926.51(c). What is spelled out: potable water must be available under 1926.51(a)(1), and ADA-accessible units in a cluster need at least 5 percent accessible, never fewer than one, under ADA Standards 213.2. Practically, most Spokane Valley general contractors place units within a short walk of active work zones, cluster them near the site entrance for pump-truck access, and keep clear route width at 36 inches per ADA 403.5.1 where accessible units are on the route. Our porta potty placement guide covers ground stability, since ADA 302.1 calls for firm, slip-resistant surfaces under accessible units. If your site permit process is unclear, check porta potty permit requirements before delivery day, since placement in the right of way needs confirming with the city and we cannot state a blanket rule here.
No. Cal OSHA governs California jobsites, not Washington. Spokane Valley contractors, and anyone searching "cal osha portable toilet requirements construction" from habit after working California jobs, fall under federal OSHA 1926.51(c) instead. The ratios are similar in spirit but Washington's own state plan enforces the federal construction standard here, not California's separate version. If you split crews between states, do not assume one state's toilet count satisfies the other's inspector. For a Spokane Valley pour, permit crew, or roofing job, 1926.51(c) is the number to build from. Pair that with OSHA portable toilet requirements as your reference page and construction site services for the rest of the sitework package: dumpsters, fencing, and power. Crews working sites near Millwood, 4.6 miles northwest, or Otis Orchards-East Farms, 10.3 miles northeast, still answer to the same federal standard, since Washington does not run parallel county-level toilet ordinances layered on top.
Toilets and handwashing are two separate requirements. General sanitation under 1926.51(c) gets you the toilet count. Handwashing after paint, coatings, herbicides or insecticides work triggers 1926.51(f)(1) specifically, and that rule only applies in those contaminant contexts, not as a blanket handwashing mandate for every trade. Separately, 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 it. A crew doing exterior painting or spraying insecticide near a landscaping job needs a real handwashing station, not just a toilet with no sink. Look at handwashing station rental or a portable sink rental for that, and see handwashing requirements for the full breakdown. Renting a deluxe flushable porta potty with a built-in sink can cover both needs in one unit on tighter sites.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $200-$400 | - |
| deluxe | $85-$1200 | $150-$290 | - |
For weekend jobs, standard units run in the $125-$400 range as a short-term rate, separate from the daily and weekly numbers above. See porta potty rental cost and porta potty rental per day for more detail, or monthly porta potty rental for longer jobs. If your project also needs debris removal, pair your toilet order with a roll-off dumpster rental and check dumpster rental cost while you are budgeting the site.
Once you pass 20 workers, 1926.51(c) requires 1 toilet seat and 1 urinal per 40 additional workers. A crew of 21 to 60 needs two full setups. Round up if you are near a threshold, since inspectors count peak crew size, not your average daily headcount on site.
Only if you have employees on site under OSHA's jurisdiction. A homeowner working alone does not trigger 1926.51(c). Once you hire a crew, even for a weekend, the ratio applies. Check home renovation porta potty for typical residential setups.
Yes, if combined headcount stays at or under 20 and the unit is reasonably accessible to both crews. Once combined crews exceed 20 workers, you need to add units per the 1926.51(c) ratio, calculated against total site headcount, not per contractor.
A standard unit carries a 60 to 70 gallon holding tank and stands about 92 inches tall on a 44 by 48 inch footprint. That capacity is built around the weekly service interval most sites use, per ANSI/PSAI Z4.3.
Only when units are clustered. ADA Standards 213.2 requires at least 5 percent of clustered single-user units be accessible, with a minimum of one. A single isolated unit on a small site does not trigger this rule the same way.
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