In Riverside, WA, there are several convenient options for dumping your RV's black and gray water.Two Rivers Marina offers a dump station where you can empty your tanks and fill up with fresh water if needed.Another option is the Casino & RV Resort, which provides a dump station for guests staying at the resort or passing through the area.Hunters Campground also has a dump station available for campers looking to dispose of their waste properly.If you're attending an event at the Grant County Fairgrounds, they offer a dump station on-site for your convenience.SunBasin RV Park is another nearby location with a dump station as well as an RV trash bin for easy waste disposal.Disclaimer: “Some locations listed in this article are the nearest of their kind to the starting point, and the actual drivable distance could exceed 200 miles."