2025 Urban Water Management Plan

Section 6 2025 Urban Water Management Plan Water Supply Characterization City of Pleasanton Public Draft | May 2026 6-28 EKI Environment & Water, Inc. provide water supply, environmental, flood and recreational benefits. The proponents of Sites Reservoir include 30 entities including several individual SWP Public Water Agencies. Sites Reservoir is expected to provide approximately 205,000 AF (Sites Reservoir Final Environmental Impact Report/Environmental Impact Statement, Table 5-30, Alternative 3) of additional deliveries on average to participating agencies under existing conditions. Sites Reservoir is currently undergoing environmental planning and permitting. Sites Reservoir project filed a water rights petition and is expected to receive a water right permit in 2026 from the SWRCB. DWR estimates of SWP supply reliability in its Draft 2025 DCR are based on existing facilities, and do not include the proposed Sites Reservoir. Zone 7 participates in the project as a member of the Reservoir Committee. Composed of 22 water suppliers from across California that are investing in the project, the Reservoir Committee provides recommendations to the Sites Project Authority to help advance the project. For planning and budgeting purposes, Zone 7 anticipates its share of flow releases from Sites Reservoir to average 5,000 AFY. Yet, the average annual water supply from Sites Reservoir is estimated to be 4,000 AFY after accounting for carriage water (i.e., supply losses as the water flows through the Delta). This level of water supply is equivalent to Zone 7’s likely share of storage in the reservoir, assumed to be about 31,170 AF (or 3% of the storage capacity allocated to participating water agencies). As currently envisioned, Sites Reservoir would be utilized by Zone 7 as a water supply for all year types (i.e., wet, average, and dry years). Source: Sites Project Authority Figure 6-5 Sites Reservoir Project: Location and Facilities