How many porta potties do I need for my event?
The number of porta potties for an event is 1 unit per 50 guests for events up to 4 hours. For 5 to 8 hours, plan 1 unit per 40 guests. A 100-guest, 6-hour party needs 3 units, or 4 with alcohol. This is our recommendation, not a state law.
Event math is our recommendation: 1 unit per 50 guests up to 4 hours, 1 per 40 for 5–8 hours, +1 with alcohol, 1 hand-wash station per 3 toilets with food. Job site minimum follows OSHA 29 CFR 1926.51 Table D-1.
The chart rounds up to whole units. The wheelchair-accessible column counts toward the total; it is not extra. Swap one standard unit for an accessible one in each group.
| Guests | Up to 4 hours | 5 to 8 hours | 5 to 8 hours with alcohol | Wheelchair-accessible (included) |
|---|---|---|---|---|
| 25 | 1 | 1 | 2 | 1 |
| 50 | 1 | 2 | 3 | 1 |
| 75 | 2 | 2 | 3 | 1 |
| 100 | 2 | 3 | 4 | 1 |
| 150 | 3 | 4 | 5 | 1 |
| 200 | 4 | 5 | 6 | 1 |
| 250 | 5 | 7 | 8 | 1 |
| 300 | 6 | 8 | 9 | 1 |
| 400 | 8 | 10 | 11 | 1 |
| 500 | 10 | 13 | 14 | 1 |
Long events with heavy use may need more. A mid-event cleaning, typically $45 to $85, resets each unit for the second half of the day. See the event porta potty rental page for what comes stocked in each unit.
Do I need extra porta potties if alcohol is served?
Alcohol adds 1 porta potty to the count for most events. Guests who drink use the restroom more often, and lines grow late in the evening. A 150-guest, 6-hour wedding with a bar goes from 4 units to 5. For more than 300 guests with an open bar, consider adding 2.
Lines are the real problem, not tank space. A standard unit holds 60 gallons, which lasts a full event day. What runs out is patience when 20 people wait for 3 doors.
Spread units out at big events. Two groups of units at opposite ends of a field cut walking and waiting. Each group should include a wheelchair-accessible unit.
Weddings often pair a restroom trailer for guests with one standard unit for staff and vendors. Planning tips are on the wedding restroom rental page.
How many hand-wash stations do I need?
Plan 1 hand-wash station for every 2 to 3 porta potties when food is served. A 2-station unit gives about 350 hand washes per fill. Events with no food can use the hand sanitizer inside each unit. Health departments often require vendor hand-washing at food events, so check with your local health office.
| Toilets | Hand-wash stations (food served) |
|---|---|
| 2 | 1 |
| 3 | 1 to 2 |
| 4 | 2 |
| 6 | 2 to 3 |
| 8 | 3 to 4 |
| 10 | 4 to 5 |
| 12 | 4 to 6 |
Place hand-wash stations between the toilets and the food. Guests then wash on the way back to eat. The hand-washing station rental page covers fill size, soap and towels.
How many wheelchair-accessible porta potties do I need?
Plan at least 1 wheelchair-accessible porta potty in every cluster of units. The 2010 ADA Standards, section 213.2, require at least 5 percent of clustered portable units to be accessible. That means 1 in a cluster of up to 20 units and 2 in a cluster of 21 to 40.
The accessible unit has a ground-level entry, a 32-inch door opening, handrails and more than 16 square feet of floor. It is about 62 inches wide, so check gates and paths before delivery.
Read the rule itself in ADA Standards section 213.2. Units for accessible use also need a level, firm route, not a muddy slope. See the wheelchair-accessible porta potty rental page for specs on the reference model.
Need it delivered today?
Call before noon, Monday to Saturday, for same-day delivery.
How many porta potties do I need on a construction site?
A construction site with 20 or fewer workers needs at least 1 toilet under OSHA 29 CFR 1926.51 Table D-1. Above 20 workers, the law requires 1 toilet seat and 1 urinal per 40 workers. Above 200 workers, it is 1 seat and 1 urinal per 50. That is the legal floor.
The OSHA table sets the minimum. Weekly service sets what actually works. One standard unit serves about 10 workers on a 40-hour week with weekly service.
Twice-weekly service roughly doubles that. The chart compares both.
| Workers | OSHA Table D-1 minimum | Our pick, weekly service | Our pick, twice-weekly service |
|---|---|---|---|
| 8 | 1 toilet | 1 | 1 |
| 25 | 1 toilet seat + 1 urinal | 3 | 2 |
| 60 | 2 toilet seats + 2 urinals | 6 | 3 |
| 130 | 4 toilet seats + 4 urinals | 13 | 7 |
Our picks are a recommendation for comfort and clean units, not law. The OSHA column is the law. Read 29 CFR 1926.51 on eCFR, and see the OSHA porta potty requirements guide for hand-washing rules.
How many people can use one porta potty?
One standard porta potty serves about 50 guests at a 4-hour event, or about 10 workers for a 40-hour week with weekly service. The 60-gallon tank is rarely the limit at a short event. Wait time and cleanliness are the limits, so add units before you add hours.
A deluxe flushing unit has a foot-pump flush and a sink. It also uses a fresh-water tank, so plan the same count or one more on a long day. Heavy-use spots, like a beer tent, need units close by.
For job sites, the construction porta potty rental page explains weekly and twice-weekly service.
What if my venue already has bathrooms?
A venue with indoor bathrooms usually needs fewer porta potties, but not zero. Two indoor bathrooms serve about the same as 2 units. For 240 guests over 6 hours, the chart says 6 units, so 4 rented units plus the 2 bathrooms is a sound plan.
Homes on a well or septic system are a special case. Many hosts want guests out of the house so the septic system does not overload. In that case, count the house as zero and order the full chart number.
Tips for home parties are on the backyard party porta potty checklist.