10012025 CUAC Water Resources Update
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Water Resources Update October 1, 2025 For Information and Discussion: Glendale’s Water Supplies Glendale’s Water Demands Post-2026 Colorado River Negotiations Drought Mitigation Projects Conservation Efforts Next Steps 2 Water Resources Topics 3 Where does our water come from? DIVERSE WATER SUPPLIES Surface Water Salt & Verde Rivers Colorado River Groundwater Effluent (Reclaimed Water) 4 Salt and Verde Rivers Annual SRP Supply = 55,455 Acre-Feet On-project = SRP member lands. Off-project = Does not include SRP member lands. • Primarily CAP water is served off-project. • If SRP water is used, it needs to be replaced. 5 Salt River Project (SRP) On-/Off-Project OASIS CHOLLA Up to 28,770 AF when the New Conservation Space (NCS) fills Up to 5,500 AF if Flood Control Space (FCS) fills in 2026, 2027, or 2028 NCS and FCS water can be used off-project. 6 Additional Supplies via SRP System SRP Watershed Conditions 7 • Western Arizona experienced less than 30% of normal precipitation from the 2024 monsoon season. • 55% full on SRP system compared to 81% last year at the same time. • 2024-2025 Winter – below average precipitation • More SRP groundwater added to the system to compensate for reduced flows. AUG 27, 2025 SRP Watershed Conditions 8 1922 Colorado River Compact split 15 million acre-feet (MAF) between the Upper and Lower Basin States. A separate 1944 treaty allocated 1.5 MAF to Mexico. Delivered via Central Arizona Project (CAP) canal to the Pyramid Peak Water Treatment Plant. 9 Colorado River Annual CAP Supply = 22,582 Acre-Feet Winter 2024-2025 precipitation was average. Spring runoff was below average. Reservoirs are at a combined 37% full compared to 43% this time last year. The Colorado River System is currently in a Tier 1 shortage and projected to remain in Tier 1 into 2026. 10 Current Colorado River Conditions Colorado River Status August 3, 2025 Total System Storage: 22.72 MAF 11 12 New Colorado River Operations in 2027 The current operating guidelines for the Colorado River expire in 2026. Ongoing negotiations between the Basin States. The exact reductions to the Central Arizona Project are unknown at this time. We are preparing for different water shortage scenarios. Pumped from wells and treated onsite or at the Oasis Water Treatment Plant. 5 active City-owned wells. Plus 5 wells in design/construction or planned City uses 7 SRP-owned wells. Plus 2 wells under construction 13 Groundwater Annual Groundwater Allocation = 7,525 Acre-Feet 14 Glendale Effluent Production and Use Glendale Effluent: 9,217 AF o Recharge accounted for 70% of effluent use o Reuse accounted for 30% of effluent use 2024 Effluent Production = 17,914 Acre-Feet 91st Avenue WWTP: 8,696 AF o Palo Verde Nuclear Generating Station (PVNGS) o Tres Rios Wetlands 15 Long-Term Storage Credits in 2023 Total: 230,072.66 16 2024 Glendale Total Potable Water Use Central Arizona Project (CAP) - 47% Salt River Project (SRP) - 51% Groundwater (GW) - 2% 51% 47% 2% CAP 2024 Total Water Use = 40,590 acre-feet 2023 Total Water Use = 37,477 acre-feet 2022 Total Water Use = 38,699 acre-feet SRP Groundwater 17 Potable Water Use from 2015 to 2024 - 50,000 100,000 150,000 200,000 250,000 - 5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000 45,000 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Acre-feet Population Estimated Service Area Population and Potable Water Use 2015 - 2024 Potable Deliveries Estimated Service Area Population Colorado River System Conservation & Compensation 18 $2.8M $400K GOAL $1.6M $2.8M GOAL Well Construction 19 Drought Mitigation Projects Verde River Sedimentation Mitigation Project Advanced Water Purification Zone 4 Well 20 Water Conservation Rebates Expanded in FY 23 21 Water Conservation Rebates Since FY23 190 146 131 72 53 15 4 3 REBATES PROCESSED REBATE TYPES Continue outreach to community and promote water conservation rebates. Monitor Colorado River conditions for potential impacts to Glendale’s supplies. Begin update to City’s Drought Management Plan for post-2026 Colorado River operating guidelines. Invest in cost-effective projects that create resilience in Glendale’s water portfolio. 22 Next Steps 23 Thank you. Questions? 24