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Section 7 2025 Urban Water Management Plan
<br />Water Supply Reliability Assessment City of Pleasanton
<br /> Public Draft | May 2026
<br /> 7-13 EKI Environment & Water, Inc.
<br />Table 7-5 Single Dry Year Supply and Demand Comparison – District Total (DWR Table 7-3)
<br /> 2030 2035 2040 2045
<br />(AF) (AF) (AF) (AF)
<br />Supply totals 16,401 17,288 18,178 19,172
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 0
<br />7.3.3 Multiple Dry Year Supply and Demand Assessment
<br />Zone 7’s 2025 UWMP indicates the ability to meet retailer demands during five-year droughts beginning
<br />in 2030, 2035, and 2040. However, beginning in 2045, Zone 7 is projecting a 14% shortfall for the fifth year
<br />of a five-year drought. Because the City anticipates the ability to access its full GPQ of 3,500 AFY will be
<br />restored through the Joint Groundwater Project, the assessment of future water supply reliability assumes
<br />that the City will rely upon groundwater to meet 3,500 AFY of its potable demands in each year of a five-
<br />year drought through 2045 and that the remaining balance will be met through Zone 7 supply purchases.
<br />For the fifth year of a five-year drought in 2045, the projected 14% reduction in Zone 7 supply availability
<br />translates to a 10% shortfall for the City.
<br />In the event of a shortfall at this level, the City anticipates enacting its WSCP at Shortage Level 2 (see
<br />Appendix D and Section 8), which is anticipated to fill the gap as shown in Table 7-6.
<br />Table 7-6 Five Consecutive Dry Years Supply and Demand Comparison (DWR Table 7-4)
<br /> Volume (AF) a
<br />2030 2035 2040 2045
<br />First year
<br />Supply totals 16,401 17,288 18,178 19,172
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 0
<br />Second year
<br />Supply totals 16,401 17,288 18,178 19,172
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 0
<br />Third year
<br />Supply totals 16,401 17,288 18,178 19,172
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 0
<br />Fourth year
<br />Supply totals 16,401 17,288 18,178 19,172
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 0
<br />Fifth year
<br />Supply totals 16,401 17,288 18,178 17,212
<br />Use totals 16,401 17,288 18,178 19,172
<br />Surplus/(shortfall) 0 0 0 (1,960)
<br />Planned WSCP Actions
<br />WSCP - supply augmentation benefit 0 0 0 0
<br />WSCP - use reduction savings benefit 0 0 0 1,960
<br />Revised Surplus/(shortfall) 0 0 0 0
<br />NOTE:
<br />While this reliability assessment is prepared based on the prescribed approach in DWR’s 2025 Guidebook, the
<br />City anticipates that it would implement WSCP in earlier years of drought.
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