Locate the nearest campsite with full hookup service available, or somewhere where you can have access to the sewer system in order to hook up the waste tank and flush it out. Avoid simply draining the waste tank wherever you feel like it, as waste water is raw sewage. Only use appropriate facilities when hooking up the waste tank of your RV.
Park the RV on a flat, level area close to the sewer hookup. Ensure the holding tank drain valve is as close to the dump station opening as possible, to make sure that any spills are contained in the proper area for waste water and raw sewage. Put on a pair of latex rubber gloves and take your sewer hose attachment to the drain valve. Double check the valves for the gray (fresh water) and black water (waste) and make sure they are closed.
Attach the sewer hose to the adaptor on the drain outlet, and ensure that it is properly aligned by checking the stubs on the tank drain and lining them up with the tabs on the adaptor. Run the hose to the dump station hole and slide it in at least six inches.
Connect the garden hose to the dump station water supply and the RV and turn on the water. Open the black water tank valve and flush the waste water out of the tank. Turn off the water and close the valve when finished. Repeat the process for the gray tank if desired.
Add four or five gallons of water to the black water tank (flushing the toilet is the easiest way to get water into the waste water tank) as well as an appropriate amount of holding tank treatment. Follow the manufacturer's instructions for the exact amount recommended depending on the size of the waste tank for your RV.
