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Reference: the porta potty planning math for events, in one thread

PinnedPorta Potty Forum Teamasked 3 viewsHow Many UnitsHow manyGuest countUnits per personAda cluster ruleEvent planning

Plan portable toilets for an event using the units-per-person guideline, then adjust for alcohol, duration, and the ADA rule. The base guideline for a four-hour event with no alcohol is one standard portable toilet for every 50 to 75 people. This is a starting point, not a final number.

Adjust for alcohol and food. Add more units if alcohol is served, because it increases restroom frequency. Add even more units if the event also serves food. A crowd that is mostly women will also require more units than a mostly male crowd.

Adjust for longer events. For events lasting more than four hours, increase the total unit count. For multi-day events like festivals, plan for daily service visits to pump the holding tank, restock supplies, and maintain cleanliness.

Follow the ADA cluster rule. The 2010 ADA Standards require that when you cluster portable toilets, at least 5% of the units (and at least one) must be an ADA-compliant portable toilet. This applies to events open to the public. For a cluster of 20 standard units, you need one ADA-compliant unit.

Consider unit types. A deluxe portable toilet with a flushing bowl and sink serves fewer people per unit than a standard model but offers more comfort. A restroom trailer with multiple stalls serves a high volume but requires level ground, truck access for pumping, and a power source.

Always confirm placement is on level ground with clear truck access for delivery and service. Post your event details, guest count, hours, alcohol, and site conditions, for specific advice.

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Jules T.Sacramento, CA

One thing people often miss is that the ADA 5 percent rule applies to the total number of units in each cluster at a single location, not the entire event. I've seen planners put one ADA unit at the main cluster but forget that a secondary cluster of 15 units across the venue also needs its own ADA-compliant unit. The 2010 ADA Standards, section 213.2.1, require compliance at each cluster where portable toilets are installed. If you have two separate groups of units, each must meet the 5 percent minimum independently. This isn't just good practice, it's the standard, and I've flagged it on site reviews where events had inaccessible restrooms in remote areas. Always map out all clusters and verify each has the required ADA units.

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