How Many Portable Toilets Do I Need?

We’re so glad you asked! With the late summer construction boom, wedding season, festivals, and county fairs in full swing, it’s a question we hear a lot. Believe it or not, there are a lot of variables at play when determining the ideal number of bathrooms for your jobsite or special event. We’ll make sure you ask all of the right questions and not only reserve the perfect number of porta-potties, but also the right kind of portable sanitation solution for your employees or guests.

Construction Site Portable Toilet Requirements

The Portable Sanitation Association International (PSAI) recommends that employers provide adequate and readily accessible sanitation, which includes toilet seats and urinals. The recommendations mandate that for up to 20 workers, one toilet seat is required; for 20 or more, one toilet seat and one urinal per 40 workers; and for more than 200, one toilet and one urinal per 50 workers.

In our experience, however, this is often insufficient for safe and efficient jobsite management. To maintain clean working conditions, foster workplace harmony, and to provide a healthy working environment, we generally recommend one portable toilet for every 7-10 people working a 40-hour work week onsite.

Weddings, Festivals, Special Events

Finding the perfect number of portable toilets for your wedding, festival, or special event can get a little tricky! While online calculators are a great place to start, there are a number of variables that a simple formula can’t account for. That’s where we come in!

First, determine how long your event will last and the ratio of men to women. If your event is scheduled to last for several days, use the longest day to determine the correct number of portable toilets and sanitation stations. Then, determine your estimated or predicted guest count. Again, if your festival lasts for several days, plan around peak attendance.

Now it’s time for all of those “special considerations.”

Food and Drink

If food and beverages will be served, you’ll need to add 10-15% to your total number of bathrooms. If alcohol will be served or consumed, plan on 15-20% more facilities.

Permanent Facilities

If permanent sanitation facilities are present onsite, factor those into your total as well. Often on-site bathrooms are unable to accommodate unusually large crowds, so you may need to augment with portable bathroom facilities. If the permanent facilities are aging or served by a septic system, it’s a good idea to have a backup plan in place in case there are any unwanted backups, shall we say.


If you’re planning a large event and you don’t know precisely who’s attending, make sure you include accessible restroom facilities. Generally speaking, you’ll want to factor in at least one handicap accessible portable restroom for every 20 standard portable toilets. At the very least, include one accessible restroom for your upcoming event. These larger portable toilets are not only ADA compliant, but they’re also great for parents with young children who may need a little more room to get the job done.


If you plan on serving food and drink, it’s a good idea to provide adequate handwashing stations in the food service areas. For all the obvious reasons. A good rule of thumb here is one handwashing station for every four porta-potties.

A Few Examples

Oasis Luxury Restroom Trailer

Oasis Restroom Trailer

If you’re planning a wedding where alcohol will be served and you’re expecting approximately 100 people, we would recommend four standard bathrooms, one accessible unit, and four handwashing stations. However, for a wedding, you may want to consider a luxury restroom trailer.

Now, let’s say you’re running a 10-hour music festival where food and drink will be served and you expect up to 10,000 attendees. For an event of this size, you’re looking at approximately 125 portable bathrooms, 35 hand sanitation units, and six to eight accessible portable toilets.

Need some help figuring out just how many portable toilets you need? Contact PBS Services today.


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