500-person corporate event with a bar: how many porta potties for 8 hours?

For your 500-person corporate event with an 8-hour duration and open bar, you need 12 to 16 total units, including at least one ADA-compliant unit. This count accounts for the extended time, alcohol consumption, and the need to prevent long lines.

The industry guideline for events starts at about one portable toilet per 50 to 75 people for a four-hour event, but with alcohol and an eight-hour duration, you should add more units. Alcohol increases usage frequency, so I recommend erring on the higher side. Include a mix of standard units and deluxe units or a restroom trailer for guest comfort. A restroom trailer provides a nicer experience but requires level ground, electrical power, and possibly a generator, which adds to logistics and cost. You must have at least one ADA-compliant unit per cluster to comply with the ADA 5 percent cluster rule.

Add handwash stations near all restroom clusters for hygiene. Service frequency should be scheduled based on use; for an event like this, a pre-event delivery and post-event pickup are typical, but if units are heavily used, additional servicing during the event might be needed. Factors driving cost include unit type, rental duration, service visits, and any special requirements like power for trailers.