RV dump station FAQ
Which tank do you empty first on an RV?
The common sequence is black first, gray second, with the gray water helping rinse the sewer hose.
Short answer
The common sequence is to empty the black tank first and the gray tank second. Gray water can help rinse residue from the sewer hose after the black tank is emptied. Follow your RV manufacturer's instructions and the dump site's directions if they specify a different process, and keep every hose connection secure throughout.
What to keep in mind
- Open the black-tank valve slowly and wait until the flow has finished before closing it.
- Open the gray-tank valve after the black tank, unless the equipment or site instructions say otherwise.
- Rinse equipment only where the dump station provides an approved rinse point; keep potable-water fittings separate.
Facility services, fees, access, and local disposal rules can change. Confirm the details with the operator or local authority before you travel.