Guide
Holding Tanks and Pumping
Holding tanks store waste on sites with no sewer connection, and pump-outs are priced separately from the tank itself at $30 to $220 a visit. Tanks pair with restroom trailers, which produce far more effluent than a standard non-flushing unit does.
How tanks are sized
Sizing follows expected use rather than a fixed rule: total people, hours on site, and whether the fixtures flush. A standard non-flushing unit holds 60 to 70 gallons in its own base and needs no separate tank. A flushing trailer does, because every flush adds freshwater to the waste volume.
Pump-out intervals
- Weekly is the baseline for a standard placement under ANSI/PSAI Z4.3.
- A trailer on a busy event may need daily pump-outs.
- Heat and alcohol both shorten the interval.
- Extra visits are $30 to $220, typically around $60.
Where tanks pair with trailers
Any site with no sewer connection: remote construction, festival fields, film locations. Ordered alongside a restroom trailer so one crew handles both.
Frequently asked questions
What does a holding tank cost?
The tank and the pump-outs are priced separately. Pump-out visits run $30 to $220, typically around $60. Call for tank pricing against your site.
How often does a holding tank need pumping?
Weekly is the baseline. A trailer at a busy event can need daily service, because flushing fixtures add freshwater volume to the waste.
Do standard porta potties need a holding tank?
No. A standard unit holds 60 to 70 gallons in its own base and is pumped on the service visit. Separate tanks are for flushing trailers and sinks.
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