- When in Milton, WA, you have several convenient options for dumping your RV waste.- The SeaTac Rest Area is a popular choice, offering dumping facilities for black water and gray water, as well as access to fresh water for tank flushing.- Another option is the Western Washington Fairgrounds / The Puyallup Fairgrounds, which provides a designated dumping area and an RV trash bin.- The Sumner Wastewater Treatment Plant also offers a dump station for RV waste disposal.- Additionally, consider checking out the Elks Lodge in the area, as they often provide dumping services for their members.























































































