Can a restroom trailer's gray water be drained into a municipal storm drain for a three-day event?

Question

I'm producing a three-day music festival in a city park with 5,000 attendees daily. We're renting a 6-stall restroom trailer with flushing toilets and sinks. The trailer has a fresh water tank and a gray water tank for sink runoff. My rental company says they'll pump the black water from the toilets, but they're vague on the gray water. The park has municipal storm drains about 50 feet away on paved paths. Can I legally drain the sink water into a storm drain? What's the standard method for gray water disposal at a temporary event like this? I need to know both the rules and the practical setup.

Owen G. · Answer

No, you cannot legally drain a restroom trailer's gray water into a municipal storm drain. Federal and local regulations prohibit discharging any wastewater, including gray water from sinks, into storm drains because storm drains flow untreated into rivers, lakes, or oceans. The standard method for gray water disposal is the same as for black water: a vacuum truck pumps both tanks during a service visit. Your rental company should handle this.

For a three-day event with 5,000 attendees daily, a six-stall restroom trailer is a reasonable start, but you may need additional standard units or a larger trailer based on crowd density and alcohol service. The trailer requires level ground, a generator or power hookup, and clear truck access for pumping. Coordinate with your rental company to schedule service visits, likely daily given the high usage. They will manage all waste disposal legally at a wastewater treatment facility.

Can a restroom trailer's gray water be drained into a municipal storm drain for a three-day event?

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