Last updated
What Does OSHA Require for Portable Toilets on Construction Sites?
The rule is 1926.51(c)(1). For 20 or fewer workers, you need one toilet. Between 20 and 200 workers, it is one toilet seat and one urinal per 40 people. At 200 or more, that ratio drops to one seat and one urinal per 50 workers. There is no separate "Oshawa" standard. It is a common misspelling of OSHA, and the rule is federal, so it applies the same way whether your crew is working a subdivision near Cheney or a downtown Spokane build. OSHA also requires potable water on site under 1926.51(a)(1). If you are not sure how many units that math gets you, our how many porta potties do I need guide walks the ratio out step by step, and you can also request a headcount-based quote through request a quote. Crews running paint, coatings or pesticide work trigger a separate handwashing requirement under 1926.51(f)(1), which is not the same as general toilet counts and gets its own equipment.
Does Cal OSHA Have Different Portable Toilet Requirements?
Cal OSHA governs California job sites, not Washington ones. Spokane contractors fall under federal OSHA and 1926.51(c)(1) for construction, or 1910.141(c)(1)(i) if the workplace is general industry rather than a construction site. The distinction matters because the ratios differ slightly by classification. A warehouse crew loading a storage container is general industry. A framing crew on a new build is construction. Both need toilets, but you check the right table for your job type. If your project mixes trades, staff a portable toilet rental plan around whichever standard covers the majority of the workforce, and confirm with whoever runs your safety program if the site is borderline. Farm labor operations fall under a different rule entirely: 1928.110 requires field sanitation with one facility per 20 hand-labor employees, reachable within a quarter mile, which matters for growers near Four Lakes or Mead running seasonal crews.
What Are the OSHA Portable Toilet Distance Requirements?
OSHA's construction rule does not set a specific foot-distance from work areas the way some state codes do. What it sets is the ratio to headcount and the requirement that facilities exist on site. Field sanitation under 1928.110 is the exception, with its quarter-mile walk limit for agricultural labor. For everyone else, the practical answer is placement that workers can reach without long walks off the working area, which is also why our porta potty placement guide covers ground clearance and access separately from the OSHA count. If you are staging a roll-off dumpster rental alongside toilets, remember a roll-off delivery needs about 60 feet of straight clearance behind the truck, so plan both layouts together rather than boxing yourself in after toilets are already placed. Units also need level ground, since a standard unit stands about 92 inches tall and can tip on a slope.
How Many Porta Potties Do I Need for My Spokane Crew?
Start with the 1926.51(c)(1) ratio, then round up, not down, because OSHA counts are minimums, not targets. A 15-person crew needs one unit. A 45-person crew crosses into the 20-to-200 tier and needs two toilet seats plus urinal service. Add units if your crew includes workers who need ADA accessible porta potty service, since ADA Standards section 213.2 requires at least 5 percent of clustered single-user units to be accessible, with a minimum of one no matter how small the cluster. Service frequency matters too: ANSI/PSAI Z4.3 sets one weekly service visit as the baseline for up to 10 users over a 40-hour week, so a 45-person crew likely needs more frequent pumping, not just more units. Pricing scales with duration:
| unit | day | week | month |
|---|---|---|---|
| standard | 100-350 | 130-500 | 125-325 |
| ada | 200-400 | 120-240 | not offered |
Longer jobs near Airway Heights or Town and Country usually run better value on a monthly porta potty rental than repeated day rentals. Check porta potty rental cost for a fuller breakdown, or porta potty rental per day if your job is short.
Do I need a permit for portable toilets on a Spokane job site?
Placement in the public right of way needs confirming with the city. We have not verified a specific Spokane ordinance for portable toilet permits, so check with the city before placing units on a street or sidewalk. See porta potty permit requirements for what to ask about.
What happens if my Spokane site fails an OSHA toilet count?
An inspector can cite the site for insufficient facilities under 1926.51(c)(1). The fix is usually fast: order enough units to match your current headcount. Spokane Porta Pros can typically deliver same-day or next-day depending on load, especially for standard units already in local rotation.
Are handwashing stations required alongside porta potties?
Not automatically. General toilet counts fall under 1926.51(c)(1), which does not itself mandate handwashing stations. But if your crew applies paints, coatings, herbicides or insecticides, 1926.51(f)(1) requires washing facilities specifically for that contaminant exposure. See handwashing station rental for options.
Do OSHA rules apply to event portable toilets, not just construction?
OSHA's construction ratio applies to job sites with employees, not spectators at an event. Events follow different planning logic based on expected attendance. Check event restroom rental or festival restroom rental for event-specific guidance instead.
Can I rent a storage container along with porta potties for one site?
Yes. Many Spokane job sites order both together for one delivery window. See storage container rental or 20ft storage container options, and note that "storage container rental Oshawa" searches are the same misspelling of OSHA, unrelated to container specs.
Next step
Get a delivery date
Tell us the address, the dates and the headcount. We size the order and confirm the route.