- Newcastle, Wyoming offers several convenient options for dumping your RV's black and gray water. - You can find dump stations at Days of 76 Campground/Lead-Deadwood Sanitary, Keyhole State Park, Days End Campground, and KOA - Devils Tower KOA Campground. - These dump stations provide fresh water for flushing tanks and have dedicated RV trash bins for easy waste disposal. - Whether you're exploring the beautiful countryside or visiting nearby attractions like Devils Tower, you'll have access to reliable RV waste disposal in Newcastle, Wyoming.