- There are several RV dump stations near Conway, Michigan, where you can conveniently dispose of your black and gray water.- East Jordan Tourist Park Campground & Beach is a popular choice, offering onsite fresh water and a hose for flushing tanks. Trash bins are also available.- St. Ignace/Mackinac Island KOA is another option with waste disposal services and access to potable water for refilling your tanks.- Kalkaska RV Park & Campground has a dump station as well as propane refilling services and a convenience store.- Marathon Truck Stop - Charlies Country Corner also provides waste disposal services, onsite fresh water, and propane refills.