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Mesa Water Resources Presented by Chris Hassert Introduction The 2007 Operating Guidelines for the Colorado River expire at the end of this year The Seven Basin States are working toward new Guidelines to start in 2027 Arizona has already absorbed supply reductions Deeper cuts inevitable to address the supply- demand imbalance on the River System Prolonged drought and robust demand have contributed to falling reservoir levels Near term hydrologic projections are not encouraging Every Water Provider is unique and must address the challenges before them On-Project vs. Off-Project "On-Project" area is the City Zone and served by SRP "Off-Project" area is comprised of the Eastern & Southern Zones and served by Colorado River Water All areas can be supplied with Groundwater Water usage for a Mesa median residential customer 6,000 gallons per month 72,000 gallons per year or 0.22 acre- feet/year 1 acre-foot serves 4.5 median residential households for 1 year 1,000 acre-feet serves 4,500 median residential customers (households) 1,000 acre-feet serves 3,000 households consuming the average demand of 9kgal per month Water Units Refresher Salt River Project (SRP) “On-Project” SRP Resources Annual af/yr SRP Cutover Land (Acres)(1) 21,194 Surface Water Allocation (af/ac/yr)(1) 2.27 Allocation Water Availability = 48,110 Normal Flow Water Availability 14,000 TOTAL SRP Water= 62,110 Central Arizona Project "Off-Project"” CAP Resources (AF/YR) Full Portfolio MESA Municipal (M&I) 43,503 M&I Total 43,503 SRPMIC Lease (IP) 1,669 IP Total 1,669 Wellton-Mohawk (P3) 2,622 P3 Total 2,622 RWCD (NIA) 627 Hohokam (NIA) 4,924 NIA Total 5,551 Available Allocation 53,345 Mesa's Additional Water Supplies Gila River Indian Community (GRIC) Water Exchange New Conservation Space (NCS) Water Groundwater Pumping Underground Long-Term Storage Credits (LTSC) Gila River Indian Community Water Exchange 5:4 exchange of Reuse Water from NWWRP, SEWRP & GWRP for CAP water delivered at SBWTP or BRWTP Water obtained through the exchange charged at the CAP pumping charge ($85/AF) opposed to M&I CAP rate of ($365/AF) Agreement allows Mesa to deliver up to 29,400 AF of Reuse water to be exchanged for 23,520 AF of CAP water For CY 2026, Mesa's CAP Order accounts for 8,128 AF of water through the Exchange Reuse water that will be delivered through the CMRP doubles the volume above New Conservation Space (NCS) Roosevelt Dam, completed in 1911 In 1996, a $430M project raised the dam by 77 feet to increase storage in Lake Roosevelt Storage increased by 304,729 acre- feet Mesa's share of increased storage is 41,000 acre-feet In the City's 100-year AWS, ADWR recognizes an annual usage of 12,500 acre-feet This water can be used anywhere in Mesa's service area Groundwater Pumping Two types of Groundwater Assured Water Supply Groundwater Allowance Incidental Recharge Groundwater can be pumped in all parts of the service area Mesa has 35 active groundwater wells Pumping could be focused in the Eastern and Southern Zones during CAP supply reductions Assured Water Supply Groundwater Allowance AF 2025 Total Demand 98,799 Annual Incidental Recharge 5.35% 5,286 Groundwater Allowance 467,895 Annual Amount 4,679 Total Annual Groundwater Allowance + Incidental Recharge 9,965 Long-Term Storage Credits (LTSCs) Mesa has over 550,000 acre-feet of LTSCs banked underground Three quarters of the stored credits are in the Roosevelt Water Conservation District (RWCD) Groundwater Savings Facility (GSF) Granite Reef Underground Storage Project (GRUSP) operated by SRP was completed in 1994 Since 2000, Mesa has banked nearly 90,000 acre- feet of Reclaimed and NCS water at GRUSP LTSCs are recovered through Mesa's groundwater pumping wells Long Term Storage Credits af GRUSP 88,228 NWUSF 49,710 RWCD GSF 413,033 SRP GSF 4,642 Red Mtn USF 1,470 Total Stored Credits 557,084 Total Annual LTSCs 5,571 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 Acre-Feet Off-Project Surface Water Supply vs Demand GRIC Exchange M & I Priority Water Total Indian Community Contracts Subcontract M & I Priority Water Historical Off-Project Demands Projected Average Growth Off-Project Demands Projected Moderate Growth Off-Project Demands 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 Acre-Feet 20% Cut to Colorado River Supplies vs Demand Scenarios GRIC Exchange M & I Priority Water 16% Cut to Total Indian Community Contracts 20% Cut to M&I Priority Water Historical Off-Project Demands Projected Average Growth Off-Project Demands Projected Moderate Growth Off-Project Demands 0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 Acre-Feet 20% Cut to Colorado River Supplies vs Demand Scenarios GRIC Exchange M & I Priority Water 16% Cut to Total Indian Community Contracts 20% Cut to M&I Priority Water ADWR Groundwater Allowance and Incidental Recharge NCS Water Long-Term Storage Credits Historical Off-Project Demands Projected Average Growth Off-Project Demands Projected Moderate Growth Off-Project Demands Future Supplies Long-Term Solutions Raise Bartlett Dam – $150M for 3,000 acre-feet per year average Divert more Reuse Water to the Gila River Indian Community State led Importation Projects selected by WIFA Advanced Water Treatment at 91st Ave WWTP – Exchange Water Septic to Sewer Continue finding and fixing leaks Real time leak detection through Smart metering Key Takeaways The current 20-year Operating Plan for the Colorado River expires at the end of this year Additional Supply reductions will be inevitable starting in 2027 Reductions may be introduced in phases Mesa began building a resilient water portfolio a half century ago and continues to add to our supplies Future supplies will be expensive as options become more scarce Water Conservation is a tool that can temper future demand Find fact sheets and more resources online at mesaaz.gov/water