The fast rule, with real numbers, from Grand Island's porta potty crew.
That covers an event of up to 4 hours. A 100-guest open house needs 2 units.
A 200-guest, 8-hour festival needs 8 units. Round up to a whole unit.
Add 1 unit for every 4 when alcohol is served. Add 1 hand-wash station for every 4 units when food is served.
The 2010 ADA Standards call for at least 5% of units in each cluster to be accessible, and never fewer than one.
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