Weston Eda Wwt Lagoon, located in Umatilla, Oregon, is a water treatment facility owned by the local government and regulated by the state. Built in 1986, this Earth dam structure stands at a height of 18.5 feet and has a storage capacity of 123 acre-feet. The lagoon serves the purpose of treating industrial waste, with a low hazard potential and a needle outlet gate system.

Despite not being rated for condition assessment, Weston Eda Wwt Lagoon undergoes inspections every six years to ensure its operational effectiveness and safety. The facility is equipped to handle emergencies, although specific emergency action plans and risk assessments are not currently available. With its strategic location in the Walla Walla District and within the jurisdiction of the state, Weston Eda Wwt Lagoon plays a crucial role in managing water resources and addressing climate-related challenges in the region.