OSHA 1926.51(c) sets the baseline: 1 toilet for 20 or fewer construction workers, and the ratio steps up from there as crew size grows. South Suffolk contractors use this rule to plan construction site services and avoid a citation walking a job site.
For construction sites, OSHA 1926.51(c)(1) lays out a table, not a guess. Twenty workers or fewer needs 1 toilet facility. Once you cross 20 workers, add 1 toilet seat and 1 urinal per 40 workers, and at 200 or more workers the ratio eases to 1 seat and 1 urinal per 50. This isn't the general industry rule; that's a separate standard, 1910.141(c)(1)(i), which applies to fixed workplaces rather than job sites. Confusing the two is common and it's why crews searching "cal osha portable toilet requirements construction" often land on the wrong table. South Suffolk crews building out a subdivision or a warehouse pad should size their standard porta potty rental count off the federal construction table first, then check whether local code adds anything on top. If you're not sure how many units your headcount needs, run the numbers on our how many porta potties do i need guide before you order. Water matters too: OSHA 1926.51(a)(1) requires an adequate supply of potable water at every place of employment, which is why job sites often pair toilets with a handwashing station rental rather than treating them as separate line items.
Count your peak headcount, not your average. A 15-person framing crew clears the 20-worker line with 1 unit under 1926.51(c)(1). A 45-person crew crosses into the next bracket and needs 2 seats plus urinals under the 40-worker step. South Suffolk general contractors bidding larger jobs, including sites near Carrsville 16.1 miles west, tend to over-order slightly rather than get caught short mid-pour. Distance and layout matter as much as headcount: ANSI/PSAI Z4.3 sets a baseline service interval of once weekly for up to 10 users across a 40 hour week, so a site with 30 workers on one unit will need faster turnaround than the standard schedule allows. If your site includes painting, coating, or pesticide work, OSHA 1926.51(f)(1) kicks in separately, requiring washing facilities for employees applying paints, coatings, herbicides or insecticides. That's a different trigger than general toilet counts, and it's easy to miss on a punch-list job. Pair your toilet order with a portable sink rental if any of that work is happening on site, and check our OSHA portable toilet requirements breakdown for the full contaminant list.
OSHA doesn't publish a hard distance number for portable toilet placement on construction sites; the standard focuses on quantity and water supply, not feet from the work area. What it does require, indirectly, is access. ADA Standards 213.2 says that where single-user portable toilet units are clustered, at least 5 percent of them, and never fewer than one, must be accessible, with a 60 inch turning circle under section 304.3.1 and a 32 inch minimum door opening per section 404.2.3. A standard unit runs about 44 by 48 inches on the ground and stands roughly 92 inches tall, which matters when you're planning tight access on an urban South Suffolk lot. If your crew includes any worker who needs an accessible stall, our ADA accessible porta potty page covers unit specs in more depth. Placement in the public right of way in South Suffolk needs confirming directly with the city; we haven't verified a specific ordinance for this, so check with your local permitting office before setting a unit at the curb. For general siting logic, our porta potty placement guide walks through drainage, wind, and truck access, which also matters for roll-off dumpster rental staged on the same lot.
Yes, in specific cases, and it's not the same rule as toilet counts. 29 CFR 1910.141(d)(2) requires washing facilities stocked with soap and towels or a hand drying device; hand sanitizer alone doesn't satisfy it. That standard applies to general industry workplaces, while on construction sites the trigger is 1926.51(f)(1), and only when workers are applying paints, coatings, herbicides or insecticides, or working around similar contaminants. A framing crew with no chemical exposure doesn't need a separate handwashing station under that rule, though most South Suffolk supervisors add one anyway for practical hygiene. If your project involves agricultural hand labor instead of construction, a different standard applies entirely: OSHA 1928.110 sets field sanitation requirements at one facility per 20 employees, reachable within a quarter mile walk, which matters for farm work near Franklin 23.8 miles west. Whichever standard applies, a hand sanitizer station rental is a supplement, not a substitute, once the washing facility trigger is met. For crews juggling multiple standards on one site, our OSHA portable toilet requirements permit page and event restroom rental guide cover non-construction gatherings where different counts apply.
Fifty workers crosses the 20-worker threshold under OSHA 1926.51(c)(1), landing in the 40-worker bracket: 1 toilet seat and 1 urinal per 40 workers. That works out to roughly 2 seats and 2 urinals for a 50-person crew, though contractors in South Suffolk often round up for buffer.
Yes, Cal OSHA has its own portable toilet standard for California job sites, separate from the federal 1926.51(c) table. South Suffolk sits under federal OSHA jurisdiction, so the 1926.51(c)(1) ratios apply here, not the California-specific version.
No. OSHA's 1926.51(c) table covers employee headcount on construction sites, not event attendance. Festivals and weddings size units by guest count and event length instead; see our festival restroom rental and wedding restroom rental pages for that math.
OSHA can cite the employer for violating 1926.51(c), and the crew may stop work informally while units get delivered. Ordering ahead through emergency porta potty rental covers a last-minute headcount jump or a failed inspection.
No. Toilet counts under 1926.51(c) and washing facility requirements under 1926.51(f)(1) or 1910.141(d)(2) are separate obligations. A site can meet its toilet ratio and still fail a handwashing requirement if paint or pesticide work is happening without soap and towels available.
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