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OSHA porta potty requirements for a construction site: how many toilets per worker? ✓ Solved

Brooke L.asked 61 viewsConstruction & Job SitesOshaConstruction siteHow manyOsha 1926 51Ada cluster rule

Accepted answer

OSHA 29 CFR 1926.51(c) requires one standard portable toilet for 1 to 20 workers, one toilet seat and one urinal per 40 workers for 21 to 199 workers, and one toilet seat and one urinal per 50 workers for 200 or more workers. Mobile crews with immediate access to nearby facilities are exempt. For 60 workers, you need two toilet seats and two urin Read the full answer

OSHA 29 CFR 1926.51(c) sets the minimum number of toilets required on a construction site. For 1 to 20 workers, you need one standard portable toilet. For 21 to 199 workers, you need one toilet seat and one urinal per 40 workers. For 200 or more workers, you need one toilet seat and one urinal per 50 workers. Mobile crews with immediate access to nearby facilities are exempt.

The count is for the peak crew size. Your site will grow to 60 workers. The OSHA rule requires two toilet seats and two urinals for that number. Many companies meet this with two standard units and one portable urinal, or three standard units. A deluxe portable toilet with a flushing bowl and sink can replace a standard unit and a handwash station.

An ADA-compliant unit is required by the ADA cluster rule. If you cluster multiple units at one location, at least 5 percent (but at least one) must be an ADA-compliant portable toilet. For a cluster of three units, one must be ADA-compliant. This unit provides the required wheelchair turning space.

Placement and service matter for compliance. The units must be serviced to be sanitary. Weekly service visits are standard. Place them on level ground with clear truck access for the vacuum truck. Blocked access results in a missed service.

For a crew of 60 working a standard week without alcohol or food service, three standard units or two standard units plus one urinal meets the OSHA minimum. Add an ADA unit if they are clustered. That's the baseline your safety officer is asking for. Does your site have any tricky access or long-term plans that change the math?

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✓ Accepted by Brooke L.

Ray M.Dallas, TX

OSHA 29 CFR 1926.51(c) requires one standard portable toilet for 1 to 20 workers, one toilet seat and one urinal per 40 workers for 21 to 199 workers, and one toilet seat and one urinal per 50 workers for 200 or more workers. Mobile crews with immediate access to nearby facilities are exempt. For 60 workers, you need two toilet seats and two urinals. This is often met with two standard units and one portable urinal, or three standard units. If units are clustered, the ADA cluster rule requires at least one ADA-compliant portable toilet per cluster. Units must be serviced weekly to remain sanitary, placed on level ground with clear truck access for the vacuum truck. Blocked access leads to missed service. Deluxe units with sinks can reduce handwash station needs, but increase service frequency due to flushing mechanisms.

  • Brooke L. Thanks Ray. I will check our crew count and ask the rental company to include an ADA-compliant unit with our cluster. The service access point is clear.
3
Deb K.Akron, OH

Ray and Hector covered the OSHA counts correctly. I will add that on my route, a service driver confirms the placement before the first delivery. We check for level ground and a clear path for the vacuum truck, which needs about 25 feet of straight access. Blocked access on service day means a missed service, and the site foreman gets a call. The ADA unit requirement is often triggered by the permit office for a site with a public-facing component, not just the cluster rule. For a crew of 60, the three standard units work, but if they are all working the same shift, expect the Monday morning units to be full. That's a common complaint that leads to a mid-week service call.

  • Brooke L. Thanks for the tip on Monday morning fullness. I'll ask my rental company about adding a mid-week service for my wedding weekend to keep things fresh.
1
Hector V.Phoenix, AZ

Ray covered the counts, but he missed the exemption check. The OSHA 1926.51 rule exempts mobile crews with immediate access to nearby facilities, like a gas station or a finished building on site. Your safety officer must document that access if you claim the exemption. Otherwise, order the units for peak headcount. For 60 workers, that's three standard units or two plus a urinal, plus one ADA unit if clustered. Service weekly, but in Phoenix heat, I push for twice a week to keep the crew from complaining. Staking is non-negotiable here; monsoons flip unsecured units.

  • Deb K. Hector is right about the heat. In our Ohio summers, a full [holding tank](https://portapotty.forum/glossary/holding-tank/) in direct sun can get rank fast, even with weekly [service](https://portapotty.forum/glossary/service-visit/). Twice-a-week service is just good crew management.

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