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OSHA 1926.51 for a 180-worker site in November 2026

Hector V.asked 0 viewsConstruction & Job SitesOsha 1926 51Service frequencyWinterizationAda unitConstruction site

OSHA 1926.51(c) requires one toilet seat and one urinal per 40 workers for a construction site with 180 employees. That means you need five toilet seats and five urinals. You must also provide at least one ADA-compliant portable toilet if you cluster units, per the ADA 5 percent cluster rule.

Standard units for the crew
Use standard portable toilets for most workers. They are non-flushing, have a holding tank, and work well on uneven ground. Order weekly service visits for pumping and cleaning. Add more units if crew size spikes above 200, since OSHA requires one toilet seat and urinal per 50 workers at that level.

ADA unit and placement
Place the ADA-compliant unit on firm, level ground with clear access. Ensure truck access for the vacuum truck on service days. In November, weather can delay work, but service must continue weekly. Use staking and tie-downs to secure units against wind.

Options for harsh conditions
Consider a deluxe portable toilet with a flushing bowl and sink if you have a water source, or a restroom trailer for supervisors. These need power and water hookups. For a bridge project with fluctuating crews, stick to standard units for flexibility. Anyone run a similar site with weather swings? How did you handle service and unit counts?

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Ray M.Dallas, TX

OSHA 1926.51(c) requires 5 toilet seats and 5 urinals for 180 workers. You need 5 standard portable toilets and 5 portable urinals, or 10 standard units if urinals are not separate. Add one ADA-compliant portable toilet per the ADA cluster rule since units are clustered. Weekly service visits are standard for pumping, cleaning, and restocking paper. Service frequency increases with heavy use, hot weather, or if units fill faster. Place all units on level ground within 25 feet of truck access for the vacuum truck. Secure units with staking and tie-downs for wind. In November, cold weather may require winterization with antifreeze in holding tanks. Deluxe units or restroom trailers are options if water and power are available, but standard units are more flexible for construction sites with changing conditions.

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