2025 Urban Water Management Plan (UWMP)
and Water Shortage Contingency Plan (WSCP)
Winola Cheong, P.E.
June 16, 2026
2City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Overview
Regulatory Requirements
Supply & Demand Trends
Supply Reliability & Drought Readiness
Key Takeaways and Recommendations
1 2
3 4
3City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Regulatory Requirements
1980 > > > > 2010 2015 2020
1983
SB 606 & AB 1668
Making Water
Conservation a
California Way of Life
First Urban Water Management Plan (UWMP) in 1985. First Water Shortage Contingency Plan (WSCP) in 2020. UWMP: Evaluate water supply reliability over a 20-year planning horizon. WSCP: Evaluate conservation and water shortage response. Updates required every 5 years. Current update due July 1, 2026.
AB 797
California Urban
Water Management
Planning Act
2025
2018
4City of Sunnyvale – 2025 UWMP & WSCP – June 2026
2025 Water Supply & Demand
SFPUC
61.1%
Valley Water
37.7%
Groundwater Wells
0.8%
Recycled Water
0.5%
Diverse Supply
Portfolio:
2 wholesalers,
6 wells, and
recycled water
Single Family
30.2%
Multi Family
26.9%Mobile Home
3.6%
Commercial
22.5%
Institutional
0.9%
Landscape
12.2%
Recycled Water
3.7%
Residential Demand
60.7%
Residential GPCD1
59.4 1 GPCD: gallons per capita per day
5City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Historical & Projected Demand vs. Population
Demand has been trending downward from 2000 to 2025 despite population increase Demand projections from 2025 to 2045 account for passive savings and anticipated population growth 70,000
90,000
110,000
130,000
150,000
170,000
190,000
210,000
0 5,000
10,000
15,000
20,000
25,000
30,000
2000 2005 2010 2015 2020 2025 2030 2035 2040 2045
PopulationWater Demand
(Acre-Feet per Year) Historical Potable Water Demand Projected Potable Water Demand Historical Population Projected Population
6City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Historical Per Capita Water Use vs. Population
Gallons per capita per day (GPCD) water use has been trending downward from 2000 to 2025 171 170
154
101
115
105
131,760 132,725
141,099
148,028
156,503
159,673
100,000
110,000
120,000
130,000
140,000
150,000
160,000
170,000
0 25
50 75
100
125
150
175
200
225
250
2000 2005 2010 2015 2020 2025 2030 2035 2040 2045
PopulationGallons per
Capita per Day
(GPCD) GPCD
Historical Population
7City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Supply Reliability Assessment
2030 2035 2040 2045
Total Supply (AFY1) 30,081 32,624 34,409 35,526
Total Demand (AFY) 21,334 24,198 26,625 29,014
Difference (AFY) 8,747 8,426 7,784 6,512
0 10,000
20,000
30,000
40,000
50,000
2030 2035 2040 2045
Acre Feet per Year (AFY)
Year
Total Supply (AFY)
Total Demand (AFY)
1 AFY: acre-feet per year.
8City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Water Shortage Contingency Plan
Sunnyvale is projected to meet demands in normal years, single dry years, and multiple dry years through 2040.
Anticipates shortfalls of up to 4% in a five-year drought beginning in 2045. WSCP establishes 6 shortage stages. Activation based on supply conditions and coordination with regional partners. Groundwater and Conservation efforts remain critical tools to help navigate potential shortages.
Stage Shortage Level Shortage Condition Shortage Response Actions 1 ≤10% Alert Increase public outreach
2 10-20% Moderate Voluntary conservation and reduce irrigation 3 20-30% Severe Allocations and mandatory conservation and required reductions, drought surcharges and increased rates, flow restrictors, and increase production monitoring 4 30-40% Critical Require additional reductions and additional drought surcharges, reduce system flushing, repair leaks immediately, increase production monitoring 5 40-50% Catastrophic No new landscaping or building permits, restrict landscape irrigation, 24-hour leak repair required, increase use of non-potable water6 >50% Catastrophic 9City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Water Conservation Efforts
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
10City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Key Takeaways
• City has sufficient water supply to meet demand under normal and single dry year • Reliable water supply portfolio
• Effective water conservation program
• Per capita water use continues to decline
• WSCP ready to respond to water shortages
11City of Sunnyvale – 2025 UWMP & WSCP – June 2026
Staff Recommendations
• Adopt a Resolution approving the 2025 Urban Water Management Plan • Adopt a Resolution approving the 2025 Water Shortage Contingency Plan Q&A