2025 Urban Water Management Plan

Section 4 2025 Urban Water Management Plan Water Use Characterization City of Pleasanton Public Draft | May 2026 4-11 EKI Environment & Water, Inc. The DRA accounts for this increase in unconstrained water demand. Table 4-6 shows unconstrained demands for 2026-2030. Table 4-6 Characteristic Five-Year Water Use (AFY) 2026 2027 2028 2029 2030 14,269 14,802 15,335 15,868 16,401 NOTE: The table shows unconstrained demand (i.e., demand in the absence of drought water use restrictions). 4.6 Water Use Sectors Not Included in Demand Projections Historical and projected water demands for the water use sectors described in CWC §10631(d)(1)(G) through (I) and listed below were not included in Pleasanton’s water demand calculations because they are not applicable to Pleasanton: • Sales to other agencies; • Saline water intrusion barriers, groundwater recharge, or conjunctive use, or any combination thereof; and • Agricultural. 4.7 Climate Change Considerations As is common throughout California, water demands in Pleasanton exhibit seasonality with peak demands in summer months when outdoor water use is highest. Climate change may alter water demand patterns, particularly for outdoor water use, due to intense heat waves, rising temperatures, and changes in precipitation, wind, and humidity. Climate change may impact Pleasanton’s future water demand and use patterns. Warmer temperatures are expected to increase irrigation demand and lengthen the timeframe for seasonal outdoor water use. In addition, climate change may increase the frequency and intensity of wildfires, which could increase water demands. Increased water efficiency and conservation, along with expanded use of recycled water, could mitigate the effects of climate change on water demands. The effects of climate change on future water demands are challenging to predict. The City’s demand projections presented in Section 4.5.3 do not explicitly account for potential climate change impacts. However, as discussed in Section 7, Zone 7 prepared the 2025 Demand Assessment, which involved conducting scenario planning to consider potential climate change impacts on water supply and demand. To account for potential climate change impacts on outdoor water use over the UWMP planning horizon, Zone 7 evaluated a scenario that incorporates a 5% increase to its retailers’ demands using a linear adjustment from 0% in 2025 to 5% in 2045, resulting in a proportional increase in outdoor water demands over time. As the actual impact of climate change on water use becomes clearer, this value can easily be updated in the model that informs the 2025 Demand Assessment. A general discussion regarding the potential impacts of climate change on Zone 7’s water supplies is provided in Section 6.10.1.