150-person corporate event: how many ADA units needed?

For a 150-person corporate event, the 2010 ADA Standards require at least one ADA-compliant portable toilet in each cluster of units. This is based on the ADA cluster rule, which mandates that at least 5 percent of the units at a single location be accessible. Since 5 percent of 150 people is a calculation based on units, not people, the rule applies to the number of toilets you place. In practice, for a single cluster of any size, you need a minimum of one accessible unit.

Total Unit Count
Start with the base number of portable toilets for your 150 guests. Industry guidelines for an all-day event without alcohol suggest starting near one unit per 50 to 75 people. For a corporate conference, plan for one unit per 50 people to ensure comfort, which means three standard portable toilets. Add one more unit if food is served or if the crowd is mostly women. Your total portable toilet count would then be three or four standard units, plus the one required ADA-compliant unit.

Placement and Configuration
Group all units together in one cluster on level ground with clear truck access for pumping. Place the ADA-compliant unit at the end of the row so a wheelchair user has a 60-inch turning space in front of it. If you use a restroom trailer with multiple stalls, at least one compartment must be accessible, which satisfies the requirement.

Key Factors
The requirement is for accessibility, not a specific number tied to guest count. Your local permit office may have stricter rules, so check your special event permit conditions. Remember, the ADA unit is in addition to your standard units, not a replacement. What's your event duration and are you serving alcohol? That affects the total unit count.