Hearing Examiner Housing Human Services Information Technology Intergov. Its two surface water supply sources are the South Fork Tolt and Cedar Rivers. Groundwater from the Highline Well Field is also used, primarily as a peak season supply source. TPU currently receives its water supply from the Green River and from groundwater wells in and near its service area.
Surface water is diverted from the Green River under Tacoma's first diversion water right claim.
SPU has an opportunity to participate in the Second Supply Project and obtain a share of the water from Tacoma's second diversion water right through implementation of the Proposed Agreement. The Proposed Second Supply Project provides for the delivery of water from Tacoma's second diversion water right as well as the ability to store this water through Phase 1 of the Howard Hanson Additional Water Storage Project. As part of this project, pipelines would be constructed and improvements would be made to TPU's headworks and fish facilities. If Seattle chooses to participate in the Second Supply Project Agreement, a North Branch of the Second Supply Pipeline would also be constructed to connect the Main Branch of the Second Supply Pipeline to Seattle's Cedar supply system in the vicinity of Lake Youngs. Water would flow north by gravity through the North Branch Pipeline to the east side of Lake Youngs where Seattle is planning to build a treatment plant.