- You'll find several dump stations around Plummer, Idaho RV Rentals that offer convenient waste disposal options for your RV.- Heyburn State Park is one of the popular spots where you can dump your black and gray water, refill fresh water, and even use a hose for flushing tanks. - Harrison City RV Park provides similar services along with a trash bin for easy disposal of your waste. - Another option is Black Rock Marina which offers a dump station for registered guests. - Arthur Johnson City Park also has a dumping facility available for RVers passing through.