How many porta potties for a 250-person corporate picnic?

For a 250-person corporate picnic lasting five hours, order four to five standard portable toilet units. The industry guideline for a four-hour event is about one unit per 50 to 75 people, so this range accounts for the slightly longer duration and the catered meal. Since this is a public event at a city park, you must include at least one ADA-compliant portable toilet to meet the ADA 5 percent cluster rule, which requires one accessible unit per cluster when multiple units are provided. Place the accessible unit on level ground with a clear path. You should also rent at least one handwash station because food is being served; this is a best practice for hygiene and may be required by the health department rules. The flat grass and good truck access will keep delivery and any potential service costs down. Since the event is under one day, no mid-event service is needed; the units will be delivered clean and picked up afterward.