When in Waterville, Washington, you have a few options for dumping your black water and gray water tanks.Two RV parks in the area that offer dump stations are SunBasin RV Park and Suncrest RV Park.If you're looking for a more convenient location, consider the dump station at Grant County Fairgrounds.Another option is Potholes State Park, which not only has a dump station but also offers fresh water and a hose for flushing tanks.Remember to properly dispose of your RV trash in the designated RV waste disposal bins.