When it comes to dumping your black and gray water, as well as filling up with fresh water, Duncan, Nebraska has a few options.Blue Valley Campground offers a dump station with a hose for flushing tanks. Streeter Park also has a dump station available for public use.Love's Travel Stops and Country Store in Duncan provides RV waste disposal, along with gas and food services. Pawnee Lake State Recreation Center is another option about 20 miles away.In addition to waste disposal services, these stations also provide trash bins for your convenience.