2006 Water Comprehensive Plan - City of Bellevue

integrated into the 1998 CWSP. The growth projections in this plan were used to develop thefuture water demand projections for Bellevue that are used in both this plan and the CascadeWater Alliance 2005 Transmission Supply Plan.SOURCE OF SUPPLYBellevue is one of several purveyors in the Seattle area that are members of the Cascade WaterAlliance (Cascade). Cascade is responsible for all of Bellevue’s water supply requirements.Cascade is also responsible for planning and developing a long-term water supply plan for itsmembers.Currently, Cascade receives water from the Seattle Public Utilities’ (SPU) Cedar and Toltsupplies. To transport water from these two supplies, SPU has three major transmissionpipelines in the Bellevue service area: the Tolt Eastside Supply Line (TESSL), the Cedar RiverEastside Supply Line (CESSL), and the Mercer Island Pipeline.The Cascade Water Alliance’s regional supply options are identified in their TSP and includesupply from one or more of the following:• Lake Tapps• Seattle Public Utilities Cedar and Tolt Rivers Supply• Tacoma Water Division Second Green River Diversion Supply• Snoqualmie River Aquifer (North Bend)• Supplies associated with reuse and reclaimed supplyTo support regional supply objectives, Bellevue participates in Cascade’s regional waterconservation program to supplement its local conservation program.As part of the Seattle/Cascade water supply contract, SPU is primarily responsible for thequality of water delivered. The water quality delivered complies with all state and federal rulesand regulations. SPU samples at various locations throughout the Bellevue service area toverify compliance with state and federal regulations including chemical and bacteriologicalparameters.3-20