PowerPoint Presentation (Added 6/6/2025)

Water Resources Update 
June 10, 2025

For information and discussion:
➢Glendale’s Water Supplies
➢Glendale’s Water Demands
➢Post-2026 Colorado River Negotiations 
➢Drought Preparedness 
➢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)

➢Delivered via Salt River Project 
(SRP) canals to the Cholla and 
Oasis Water Treatment Plants.
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

6
Current Salt River Project Conditions
➢2024 Monsoon precipitation was 
third lowest on record.
➢2024-25 Winter precipitation was 
below average with spring runoff 
driest on record.
➢As of May 12, Salt and Verde 
reservoirs are 67% full compared 
to 92% this time last year.

➢Up to 27,250 AF for 
Glendale when the New 
Conservation Space 
(NCS) fills.
➢NCS water can be stored 
in Roosevelt Lake or 
recharged.
➢NCS water can be used 
off-project.
7
Additional Supplies via SRP System
SRP Conservation Storage: 1,326,803 AF
New Conservation Space Storage: 287,703 AF

➢Delivered via Central Arizona 
Project (CAP) canal to the 
Pyramid Peak Water 
Treatment Plant.
➢Water from CAP can be used 
throughout City’s water 
service area.
8
Colorado River
Annual CAP Supply = 22,582 Acre-Feet

9
Current Colorado River Conditions
➢Winter 2024-2025 precipitation 
was average.  Spring runoff is 
below average.
➢Reservoirs are at a combined 40% 
full compared to 42% this time 
last year.
➢The Colorado River System is 
currently in a Tier 1 shortage.
➢April 2025 24-Month Study: 
predicts Tier 1 shortage for 2026

➢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 1 well under construction
10
Groundwater
Annual Groundwater Allocation = 7,525 Acre-Feet

11
Glendale Effluent Production and Use
➢Recharge accounted for 70% of effluent use
➢Reuse accounted for 30% of effluent use
➢Wastewater sent to 91st Avenue Wastewater 
Treatment Plant
o
Palo Verde Nuclear Generating Station (PVNGS) 
o
Tres Rios Wetlands
2024 Effluent Production = 17,914 Acre-Feet

➢Store water underground for future use
➢Typical annual accrual: 6,000-6,500 AF
➢Total accrued through 2023: 203,073 AF
➢Recover credits through wells
12
Long-Term Storage Credits (LTSCs)

13
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

14
Potable Water Use from 2015 to 2024
 -
 50,000
 100,000
 150,000
 200,000
 250,000
 -
 10,000
 20,000
 30,000
 40,000
 50,000
Acre-feet
Population
Estimated Service Area Population and Potable Water Use 2015 - 2024
Potable Deliveries
 Estimated Service Area Population

15
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, but 
cuts could be up to 100%.
➢We are preparing for different water 
shortage scenarios.

➢Increase groundwater use up 
to 7,525 AF per year
➢Use NCS water (~24,000 AF)
➢Recover LTSCs (203,073 AF)
16
Glendale’s Planning Efforts
Operational 
Scenario
Reduction
CAP 
Available
Normal (no cuts 
to CAP)
Not 
Applicable
22,582
25% Cut to CAP
5,646
16,936
50% Cut to CAP
11,291
11,291
75% Cut to CAP
16,936
5,646
All volumes are in acre-feet

17
Long-Term Water Resource Supplies
Sending high-quality effluent 
through an advanced water 
treatment process to create 
drinking water.
Evaluating options to address 
loss of storage capacity in Verde 
River reservoirs.  Potential 
expansion of Bartlett Dam to 
enlarge reservoir’s water storage 
capacity

18
Stages of Drought Management Plan
The Drought Management 
Plan is for residents and 
businesses in the 
Glendale water service 
area.

19
Water Conservation Rebates Expanded 
in FY 23

20
Water Conservation Rebates Since FY23
154
129
115
51
44
10
3
0
50
100
150
200
REBATES PROCESSED
REBATE TYPES

➢Continue outreach to community and promote water 
conservation rebates.
➢Continue to monitor Colorado River conditions and prepare for 
reductions in water supplies.
• Groundwater wells
• Verde Reservoirs project
• Advanced Water Purification
➢Begin update to City’s Drought Management Plan for post-2026 
Colorado River operating guidelines.
21
Next Steps

22
Thank you. Questions?