I just called Button Bay State Park because I’m camping in the area next week. They charge to use their dump station if you’re not camping there. Per their website, $25 for RV’s up to 30 feet, $50 for RV’s and buses over 30 feet. (The guy on the phone only said $25 and didn’t mention RV length.) 5 Button Bay State Park Rd, Vergennes, VT 05491 Call for hours: (802) 475-2377 https://www.vtstateparks.com/parks/button-bay FYI, I haven’t been there. For $25, I probably won’t go.
