Reviewed by Noel, owner of Noel Portable Toilets Rental
How many porta potties do I need for my number of guests?
Plan 1 standard porta potty per 50 guests for every 4 hours of event time. A 100-guest, 4-hour party needs 2 units. The same party running 6 hours needs 4 units. Add 1 unit for every 4 when alcohol is served, and include at least 1 wheelchair-accessible unit at public events.
| Guests | Up to 4 hrs | 5–8 hrs | 9–12 hrs |
|---|---|---|---|
| 25–50 | 1 | 2 | 3 |
| 51–100 | 2 | 4 | 6 |
| 101–150 | 3 | 6 | 9 |
| 151–200 | 4 | 8 | 12 |
| 201–300 | 6 | 12 | 18 |
| 301–500 | 10 | 20 | 30 |
Method: 1 unit per 50 guests per 4-hour block (common industry planning chart). This is a planning guide, not a legal minimum. Some event permits set their own count; check with your permit office.
How do alcohol, food and guest mix change the count?
Add 1 unit for every 4 units when alcohol is served, with a minimum of 1 extra. Add 1 hand washing station for every 4 toilets, and at least 1 beside any food stand. For events where most guests are women, add 1 unit for every 4 because lines form faster.
Worked example: a 150-guest wedding reception, 6 hours, with a bar. The chart says 6 units. Alcohol adds 1 (6 ÷ 4 = 1). Total: 7 units, or a 2-stall restroom trailer plus 2 standard units. Add 2 hand washing stations.
How many porta potties does a construction crew need?
OSHA 29 CFR 1926.51(c) requires 1 toilet for 20 or fewer workers, 1 seat and 1 urinal per 40 workers for 20 to 199 workers, and 1 seat and 1 urinal per 50 workers for 200 or more. For comfort with weekly service, we recommend 1 unit per 10 workers on a 40-hour week.
Source: OSHA 1926.51 Table D-1. Minnesota adopts federal construction standards through MNOSHA (Minn. R. 5205.0010).
How many accessible units and hand washing stations do I need?
Public events need at least 5% of portable toilets in each cluster to be accessible, and never fewer than 1, under 2010 ADA Standards section 213.2. Plan 1 hand washing station per 4 toilets. Minnesota food stands each need their own hand washing setup with water, soap and towels.