OSHA requires 1 toilet per 20 workers on a construction site with 20 or fewer employees, per OSHA 1926.51(c)(1). Above that, ratios shift to toilet seats plus urinals. Kirkland contractors sizing a job site should count heads before ordering standard porta potty rental units.
The construction standard, OSHA 1926.51(c)(1), sets the baseline: 20 workers or fewer means 1 toilet facility, no exceptions carved out for short jobs. From 20 workers up to 200, the rule shifts to 1 toilet seat and 1 urinal per 40 employees. At 200 or more, it drops to one seat and one urinal per 50. This is separate from general industry rules under 29 CFR 1910.141(c)(1)(i), which apply to fixed workplaces, not job sites. A Kirkland framing crew of 15 needs just one unit under this math, but a crew that grows past 20 needs a recount fast. OSHA also requires potable water at all places of employment under OSHA 1926.51(a)(1), which is why a lot of crews pair a toilet order with a handwashing station rental or a portable sink rental instead of treating them as separate purchases later. If you're not sure how the headcount math works for your crew size, our how many porta potties do I need guide walks through it step by step, and general OSHA portable toilet requirements content covers edge cases like multi-shift sites.
Start with a headcount, not a guess. A 20-person crew needs 1 unit minimum under OSHA 1926.51(c)(1); a 60-person crew crosses into the 40-worker ratio and needs at least 2 combined seat-and-urinal setups. Cal OSHA portable toilet requirements construction rules track closely with the federal standard but Washington sites fall under federal OSHA, so Kirkland crews should use the ratios above rather than California-specific figures. Multi-shift jobs complicate this: if two shifts overlap even briefly, both crews count toward the same ratio at that hour. Renting standard porta potty rental units by the week often pencils out better than daily rentals once a job runs past a few days, and our porta potty rental cost page breaks down where that crossover typically lands. Agricultural operations follow a different standard entirely: OSHA 1928.110 requires field sanitation facilities within a quarter mile walk of hand-labor employees, at one per 20 workers, which matters for any Kirkland-area farm crew. If your site sits near Bothell, 6.1 miles north, or Woodinville, 7.8 miles northeast, delivery logistics stay simple since Kirkland Porta Pros covers that whole corridor.
OSHA does not set a hard maximum distance from workstation to toilet the way some state agriculture rules do. What OSHA does specify is accessibility once a toilet is placed: ADA Standards section 213.2 requires at least 5 percent of clustered single-user units to be accessible, with a minimum of one, whenever multiple portable toilets sit together on a site. That accessible unit needs a 36 inch clear route per ADA Standards section 403.5.1 and a 32 inch door opening under ADA Standards section 404.2.3. Placement in the public right of way in Kirkland needs confirming directly with the city; check our porta potty permit requirements page before setting units on a street or sidewalk. For general placement logic on private lots, firm and level ground matters most since ADA Standards section 302.1 calls for stable, slip-resistant surfaces at accessible units. A roll-off delivery on the same site needs roughly 60 feet of straight clearance behind the truck, so plan toilet and roll-off dumpster rental placement together rather than as an afterthought.
Yes, but the two washing rules cover different situations and people mix them up constantly. OSHA 1926.51(a)(1) requires potable water at all job sites, full stop. OSHA 1926.51(f)(1) is narrower: it only kicks in where workers apply paints, coatings, herbicides or insecticides, or handle other harmful contaminants. That's not a general handwashing mandate, it's contaminant-specific. Separately, 29 CFR 1910.141(d)(2) requires soap and towels or a hand-drying device at washing facilities; hand sanitizer alone does not satisfy it. Kirkland painting contractors and pesticide applicators should order a handwashing station rental or hand sanitizer station rental specifically because of the 1926.51(f)(1) trigger, not just as a courtesy. General housekeeping rules under OSHA 1926.25 also require debris cleared from work areas, which is where a construction dumpster rental or storage container rental earns its keep alongside the sanitation gear. Kirkland job sites near Kenmore, 5.5 miles northwest, coordinate all of this on one delivery run.
| unit | day | week | month |
|---|---|---|---|
| standard | $100-$350 | $130-$500 | $125-$325 |
| ada | $200-$400 | $250-$500 | - |
| deluxe | $85-$1200 | $150-$290 | - |
Once your crew passes 20 people, OSHA 1926.51(c)(1) shifts the ratio to seats and urinals per 40 workers rather than a flat one-per-site rule. Recount at every headcount change, not just at project start, since crews grow mid-job.
No fixed distance exists in the construction standard itself. Agricultural field sanitation under OSHA 1928.110 does require facilities within a quarter mile, which matters for farm sites but not general construction crews in Kirkland.
No. 29 CFR 1910.141(d)(2) requires soap plus towels or a hand-drying device at washing stations. Sanitizer alone does not satisfy that standard, so pair any toilet order with an actual handwashing station rental.
If you're clustering multiple portable toilets, yes, at least one accessible unit is required under ADA Standards 213.2. Single isolated units on small residential jobs typically don't trigger this, but check our ADA accessible porta potty page for specifics.
Right-of-way placement needs confirming with the city before delivery. Private lot placement is usually simpler; see our porta potty placement guide for surface and clearance basics that apply either way.
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