OSHA Porta Potty Requirements for Construction Sites
The legal minimum for job site toilets and hand washing, what is exempt, and how we size crews so the site stays usable all week.
- Can you deliver to me?Job sites across Mansfield and nearby cities, with units placed where both crews and our service truck can reach.
- When can it arrive?Same day on weekday orders by 12 PM, so a missing unit never holds up an inspection for long.
- Which unit do I need?OSHA's minimum is 1 toilet for 20 or fewer workers, then 1 seat + 1 urinal per 40.
- How is it cleaned?OSHA requires sanitary units. We service every 7 days, and twice weekly for big summer crews.
- What is the full cost?Our 28-day rates are on the price guide, including weekly service and a one-time delivery fee.
Weekday cutoff for same-day delivery. Call before noon and your unit rides this afternoon's route.
Mon–Fri 7 AM–6 PM · Sat 8 AM–12 PM. Live answer during business hours · Quote replies within 1 business hour.
How many toilets does OSHA require on a construction site?
OSHA requires at least 1 toilet for 20 or fewer workers on a construction site, under 29 CFR 1926.51(c), Table D-1. Sites with 20 or more workers need 1 toilet seat and 1 urinal per 40 workers. Sites with 200 or more workers need 1 toilet seat and 1 urinal per 50 workers.
| Number of employees | Minimum facilities (Table D-1) |
|---|---|
| 20 or less | 1 |
| 20 or more | 1 toilet seat and 1 urinal per 40 workers |
| 200 or more | 1 toilet seat and 1 urinal per 50 workers |
Source: osha.gov, 1926.51 and the eCFR text. This page explains the rule; it is not legal advice. Confirm site requirements with your safety officer or inspector.
How many porta potties should a crew actually have?
We recommend 1 standard porta potty for every 10 workers on a 40-hour week with weekly service. That is stricter than OSHA's minimum because a 60-gallon tank used by 20 workers fills in 3–4 days. In July and August, add twice-weekly service for any crew of 10 or more.
| Crew size | OSHA minimum | Our weekly-service plan | Summer plan |
|---|---|---|---|
| 1–10 | 1 | 1 unit | 1 unit |
| 11–20 | 1 | 2 units | 2 units or 1 unit twice weekly |
| 21–40 | 1 seat + 1 urinal | 3–4 units | 4 units, twice weekly |
| 41–60 | 2 seats + 2 urinals | 5–6 units | 6 units, twice weekly |
Each standard unit has both a seat and a urinal, so one unit meets "1 seat + 1 urinal."
Does OSHA require hand-washing stations on job sites?
OSHA 29 CFR 1926.51(f) requires washing facilities where workers apply paints, coatings, herbicides or insecticides, or work with other harmful materials. The facilities must be close to the work and kept clean and stocked. A two-sided portable station with soap and towels covers this on most sites.
See hand-washing station rental.
Which job sites are exempt from OSHA toilet rules?
OSHA's construction toilet rule does not apply to mobile crews that have ready transportation to nearby toilet facilities, such as a road crew that can drive to a restroom. Every other construction site needs toilets on site. Construction-only sites are also exempt from ADA accessible-unit counts under section 203.2.
What are the OSHA rules for farm field workers?
OSHA 29 CFR 1928.110 requires 1 toilet and 1 hand-washing facility for every 20 field workers when 11 or more hand-laborers work on a given day. Facilities must sit within a quarter-mile walk of the work, or at the nearest vehicle access point if the field is farther out.
Source: osha.gov, 1928.110. Farms in Johnson and Ellis counties can rent units and stations on 28-day cycles.
OSHA FAQ
Does OSHA say how often a job site porta potty must be cleaned?
OSHA requires toilets to be kept sanitary but does not set a cleaning interval in 1926.51. Weekly service is the industry norm; busy or summer sites need twice weekly.
Do I need separate toilets for men and women?
1926.51 requires separate toilet rooms by sex unless the toilet rooms are occupied by one person at a time and can be locked from inside. Single-user porta potties with an inside latch meet that.
Can my crew use a nearby business's restroom instead?
Only mobile crews with ready transportation to toilets are exempt. A fixed job site needs its own facilities.
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