Do all restroom trailers require a fresh water hookup for a one-day event?

Not all restroom trailers require a fresh water hookup for a one-day event; trailers with onboard fresh water tanks can operate independently. The onboard tank supplies water for flushing toilets and sinks, eliminating the need for a continuous external connection. For your festival with 500 people over 8 hours, an onboard tank is feasible, but capacity matters, a larger tank reduces the risk of running out of water. Trade-offs include: tanks require pre-filling before delivery, and capacity limits mean careful monitoring for longer events or heavy use. Without a hookup, you rely solely on the tank, so discuss size with your rental company based on expected usage. Restroom trailers also need level ground and power, typically from a generator if no electrical hookup exists. Pumping is handled by a vacuum truck after the event, similar to standard units. For guest counts, the guideline is about one unit per 50 to 75 people for a four-hour event; add units for alcohol, longer duration, and food service to avoid lines.