November 2026 corporate retreat: 75 people for 3 days

You need a total of 4 to 6 portable toilets for 75 people over three days, including at least one ADA-compliant unit per the ADA cluster rule. The OSHA 29 CFR 1926.51 construction standard does not apply here since this is a guest event, not a worksite. Use the event planning guideline: one unit per 50-75 people for a four-hour event. For three days with alcohol served, plan for more units, start with 4 and add 2 more if the crowd is mostly women or to reduce lines. The ADA Standards for Accessible Design require at least one accessible unit in any cluster, so your minimum is one ADA-compliant portable toilet.

For unit types, standard units are cost-effective but lack sinks. Deluxe units with flushing and sinks add comfort but need more frequent service due to smaller holding tanks. A restroom trailer offers multiple stalls and amenities but requires power and level ground, driving up cost. Service frequency: weekly is standard, but for a three-day event with alcohol, schedule a service visit during or after the event to prevent overfilling. Your gravel site and truck access simplify placement and service.