Alternative Water Supply (AWS) Plan
June 2023
Manisha Kothari
AWS Program Manager, SFPUC
Need for Alternative Water Supply Plan
2 • SFPUC faces water shortages in future dry years with changing regulations and climate change • SFPUC Commission faces decision on whether to make San Jose and Santa Clara permanent by 2028 Regional Water System’s Ability to
Address Demands In Dry Years
(Supply, Rationing)
Basis for Planning: Definitions
3 Water Availability
System Needs from Existing
Permanent (Wholesale and Retail)
and Interruptible Customers
Obligations
Demands
What Alternative Water Supply Program
is Trying to Solve
Gap
Water Availability
• 2018 Bay-D elta Plan
Amendment
• Climate uncertainty
• Future regulations
Basis for Planning: Influencing Factors (Drivers)
4 Obligations
• Legal and contractual
• Retail service area
• Decision on San Jose
and Santa Clara
Demands
• Demand projections
• Reliance on SF
PUC
Regional Water System
Water
Availability
Obligations
Demands
Gap
Plan for Obligations, Build for Demands
Water Supply gap
-122 mgd
Existing obligations + San Jose & Santa Clara
265 mgd + 9 mgd
Water Availability
152 mgd
With 2018 Bay-Delta Plan Amendment
Water Supply gap
-92 mgd
Total 2045 demands on the RWS
244 mgd
Water Availability
152 mgd
With 2018 Bay-Delta Plan Amendment
Meeting Obligations Meeting Demands
Alternative Water
Supply Projects
1. Daly City Recycled Water Expansion
2. SF- Peninsula Regional PureWater
3. Alameda County Water District- Union
Sanitary District Purified Water
4. South Bay Purified Water (with San
J
ose and Santa Clara)
5. Los Vaqueros Reservoir Expansion
(
Storage + Supply + Conveyance)
6. Calaveras Reservoir Expansion
S
torage + Conveyance)
Other local and San Joaquin Valley projects beyond this Program can help reduce the projected supply gap
Gap in Meeting Demands
0.7 3.9
6 5.4
28.6 3.5
32.9 11
30 48.1 mgd
122 mgd
92 mgd
Daly City Recycled Water Expansion
SF-Peninsula Regional PureWater
Alameda County-Union Sanitary District Purified Water
Calaveras Reservoir Expansion
South Bay Purified Water
Los Vaqueros Reservoir Expansion
Recommendation Highlights
8 • Implement 2 projects: Los Vaqueros Expansion (storage, supply, and conveyance components) and Daly City Recycled Water Expansion (4.6 mgd supply) • Continue planning through CEQA and 30% design for remaining 4 projects • Create 3 new positions for planning and implementation of Alternative Water Supply Program • Support funding for completion of local and regional groundwater projects (WSIP) • Explore development of a fund to support implementation of local projects M
anaging the Water Supply Gap
Filling the Water Supply Gap
Potential budget impact: To be determined
Potential budget impact: New funding of $209 million estimated over next 10 years; will be further evaluated by Alternative Water Supply Program staff working with Capital Planning and Finance teams in light of other capital investment and financial sustainability priorities in the FY2025-FY2034 Capital Improvement Program (CIP) budget development process
Key Takeaways
1. Alternative Water Supply Projects can improve dry year reliability but will not el
iminate the projected gap in 2045.
2. Implementing Alternative Water Supply Projects will need additional staff s
upport in key strategic areas (operational integration, purified water, financing).
3. Affordability is a key issue that needs to be addressed as we invest in A
lternative Water Supplies.
4. Parallel actions to manage and reduce the gap, such as Voluntary Agreement negot
iations and demand reduction, are critical.
5. The question of how to make San Jose and Santa Clara permanent remains and
is being evaluated through the South Bay Purified Water Project.
Schedule and Next Steps
10 For more information visit:
sfpuc.org/awsplan
Today: Presentation – AWS Plan preview
End of June – Draft plan available on SFPUC website
End of August – Comments due on the AWS plan
October / November – Final AWS Plan to SFPUC Commission