- In Hay River, Wisconsin, there are a few convenient options for dumping your RV's black and gray water tanks.- You can find dump stations at North Park, the City of Eau Claire Wastewater Treatment Plant, O'Neil Creek Campground & RV Park, and Hatfield Park.- These dump stations provide access to fresh water for flushing tanks and typically have a hose available for this purpose.- Additionally, some stations may feature an RV trash bin for easy disposal of waste.- Remember to follow proper RV waste disposal etiquette when using these facilities.