2025 Urban Water Management Plan (UWMP)
and Water Shortage Contingency Plan (WSCP)
Winola Cheong, P.E.
May 18, 2026
Attachment 4
2City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Agenda
Background
Water System Overview
Supply & Demand
Drought Response
Water Conservation Programs
1 2
3 4
5 Attachment 4
3City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Background
1980 > > > > 2010 2015 2020
1983
SB 606 & AB 1668
Making Water
Conservation a
California Way of Life
Sunnyvale’s first Urban Water Management Plan (UWMP) was filed in 1985. Update every 5 years. Current update due July 1, 2026. Goal: Evaluate water supply reliability over a 20-year planning horizon. Water Shortage Contingency Plan (WSCP) required since 2020 to evaluate conservation and water shortage response.
AB 797
California Urban
Water Management
Planning Act
2025
2018
Attachment 4
4City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Key Changes since 2020
Moffett Park Specific Plan
Adopted in July 2023
Forecast demand increase at buildout (2045): 7,400 AFY1 - (90% potable, 10% non-potable)
Recycled Water Master Plan Update
Completed in October 2024
Potential new recycled water demand: 1,176 AFY (1.05 MGD2) Bay-Delta Plan
December 2025: revised draft advances Voluntary Agreements (flow commitments paired with habitat restoration as alternative to strict flow mandates)
Final adoption expected in late 2026.
1 AFY: acre-feet per year.
2MGD: million gallons per day. 1 MGD = 1,120 AFY
Attachment 4
5City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Potable Water Supply Sources
3 Supply Sources:
San Francisco Public Utilities Commission (SFPUC)
Santa Clara Valley Water District (Valley Water)
6 Groundwater Wells
6 SFPUC Turnouts, 2 Valley Water Turnouts
Above: Valley Water Turnout at Wright Ave.
Water flows from right (Valley Water’s pipes) to left (Sunnyvale’s pipes).
Attachment 4
6City of Sunnyvale – 2025 UWMP & WSCP – May 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
Attachment 4
7City of Sunnyvale – 2025 UWMP & WSCP – May 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 growth in the Moffett Park area 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
(AFY) Historical Potable Water Demand Projected Potable Water Demand Historical Population Projected Population
Attachment 4
8City of Sunnyvale – 2025 UWMP & WSCP – May 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
Attachment 4
9City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Supply Reliability Assessment
2045204020352030
35,52634,40932,62430,081Total Supply (AFY)
29,01426,62524,19821,334Total Demand (AFY)
6,5127,7848,4268,747Difference (AFY)
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)
Attachment 4
10City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Shortage Contingency Plan
Water Supply Reliability Assessment for 3
Scenarios:
Normal Year:
Meets all water demands through 2045
Single Dry Year:
Meets all water demands through 2045
5-Year Drought:
• Meets all water demands through 2040
• Shortfalls up to 4% from the 2nd to 5th year
of a 5-year drought period beginning in
2045
Photo Credit: https://www.sfchronicle.com/climate/article/These-before-after-images-of-Bay-Area- reservoirs-16411758.php
Attachment 4
11City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Shortage Contingency Plan
Sunnyvale's WSCP establishes 6 shortage stages
Annual supply vs. demand assessment determines when to activate a stage Coordination with SFPUC and Valley Water on shortage protocols Shortage Response ActionsShortage ConditionShortage LevelStage Increase public outreachAlert≤10%1
Voluntary conservation and reduce irrigationModerate10-20%2 Allocations and mandatory conservation and required reductions, drought surcharges and increased rates, flow restrictors, and increase production monitoringSevere20-30%3 Require additional reductions and additional drought surcharges, reduce system flushing, repair leaks immediately, increase production monitoringCritical30-40%4 No new landscaping or building permits, restrict landscape irrigation, 24-hour leak repair required, increase use of non-potable water
Catastrophic40-50%5
Catastrophic>50%6
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12City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
Attachment 4
13City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs: Regional Partnership
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
BAWSCA: Bay Area Water Supply and Conservation Agency
Attachment 4
14City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs: Rebate Programs
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
Residential Rebate Programs Landscape Rebate Programs Commercial, Industrial, and Institutional (CII) Rebate Programs
FY 24-25:
210 aerators, 160 showerheads, 6 Water Wise Home DIY Kits, 37 landscape rebates totaled $147,710
Attachment 4
15City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs: Public Outreach
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
• City Drought and Water Conservation Webpage
• Social Media: Instagram, Facebook , Nextdoor
• Postcard
• Yard Signs
• Theater Ads
• Utility Bill Insert
• Community Tabling
• BAWSCA Landscape Webinars
• Outreach at Sunnyvale Public Library
• City Publications: Sunnyvale Sun Newspaper , Update
Sunnyvale, Horizon, Sustainable Sunnyvale Newsletter
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16City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs: Water Waste Ordinance
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
Permanent Restrictions:
No car washing unless using
an auto shut-off nozzle
No paved area washingIrrigation runoff prohibited year- round
Serve water by request only
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17City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Water Conservation Programs: Water Use Data
Regional
Partnership
Rebate
Programs
Public
Outreach
Municipal
Code
Water Use
Data
City is 100% Metered
T otal Connections: 28,514 (2025)
Coming Soon: Automated Metering Infrastructure (AMI)
Credit: https://www.franklintn.gov/government/departments-k-z/water-management-department/advanced-metering- infrastructure-ami
Attachment 4
18City of Sunnyvale – 2025 UWMP & WSCP – May 2026
2025 UWMP & WSCP Key Findings
• City has sufficient water to meet demand under normal and single dry year • Reliable water supply portfolio and regional partnership with SFPUC and Valley Water • Effective water conservation program
• Per capita water use continues to decline
• Bay-Delta Plan outcome may reduce dry year supply
• Groundwater will be key dry year resource
• WSCP ready to respond to water shortages
Attachment 4
19City of Sunnyvale – 2025 UWMP & WSCP – May 2026
Staff Recommendation
Recommend City Council to take the following actions on June 16:
• Adopt a Resolution approving the 2025 Urban Water Management Plan. • Adopt a Resolution approving the 2025 Water Shortage Contingency Plan.
Attachment 4
Q&A
Attachment 4