“A multicounty agency authorized to plan for and
acquire supplemental water supplies, encourage
water conservation and use of recycled water on
a regional basis.”
[BAWSCA Act, AB2058 (Papan-2002)]
BAWSCA Service Area
Every drop counts. Use Water Wisely.
BAWSCA Update for
the SFPUC Commission
Nicole Sandkulla
CEO/General Manager, BAWSCA
April 23, 2024
BAWSCA Annual Survey: A Valuable & Reliable Source of Data Used for Regional Water Planning
• Annual Survey conducted since 1996
• Collection of key service area information by individual agency and for region
Current water supply from each source
Current and projected water purchases from RWS
Projected water supplies and demands
Consumption by customer class
Current and projected population
Per capita water use
Single family water bills and rate structures
BAWSCA member agency profiles
• FY 2022-23 Annual Survey available on BAWSCA website
• FY 2022-23 water use date reflects drought conditions
In FY 2022-23, 32% Less Water Used in BAWSCA Region Compared to FY 1986-87 Despite a 34% Population Increase
0 200,000
400,000
600,000
800,000
1,000,000
1,200,000
1,400,000
1,600,000
1,800,000
2,000,000
0 50
100
150
200
250
300
Population (Millions)
Millions Gallons Per Day (mgd)
Total Water Use Drought Year Population
Water Use Efficiency Investments Result in a 52% Decrease in Residential Per Capita Use in the BAWSCA Region Since 1975-76 Peak: 186.5 gpcd
FY 2022-23: 90.6
Peak: 114.9 gpcd
FY 2022-23: 55.1
0 20
40 60
80 100
120
140
160
180
200
1975-76
1976-77
1977-78
1978-79
1979-80
1980-81
1981-82
1982-83
1983-84
1984-85
1985-86
1986-87
1987-88
1988-89
1989-90
1990-91
1991-92
1992-93
1993-94
1994-95
1995-96
1996-97
1997-98
1998-99
1999-00
2000-01
2001-02
2002-03
2003-04
2004-05
2005-06
2006-07
2007-08
2008-09
2009-10
2010-11
2011-12
2012-13
2013-14
2014-15
2015-16
2016-17
2017-18
2018-19
2019-20
2020-21
2021-22
2022-23
Per Capita Consumption
Gross Per Capita (gpcd) Residential Per Capita (gpcd)
Dashed line indicates drought year
Average Resident in BAWSCA Region Used 55 Gallons per
Day in FY 2022-23
Source: BAWSCA FY 2022-23 Annual Survey
0 20
40 60
80 100
120
140
160
180
200
0 10 20 30 40 50 60 70 80 90 100
Cumulative Percentage of Population
Residential Per Capita Consumption
Purissima Hills
Water District
City of Palo Alto
City of San Bruno
City of East
Palo Alto
• 4% of the service
area population
used 100 gallons
per day or more
• Average resident
used 55 gallons per
day
• 72% of service area
population used 55
gallons per day (or
less than the
average resident)
Comparing T wo Years Shows Impact of Local Action on Average Residential Water Use (Gallons Per Capita Per Day, gpcd) Source: BAWSCA FY 2022-23 Annual Survey
Year
Average
Residential
Use (gpcd)
# of Wholesale
Customers
with gpcd
< 45
# of Wholesale
Customers
with gpcd of
46-55
# of Wholesale
Customers
with gpcd of
56-70
#of Wholesale
Customers
with gpcd of
71-100
# of Wholesale
Customers
with gpcd
> 100
2012-13
(prior to last
2 droughts &
pandemic)
79.3 0 5 6 12 3
2022-23
(last year of
drought)
55.1 10 10 2 1 3
• Data shows reduction in residential per capita use throughout service area. • Reductions reflect investments by water agencies and their customers. • Reductions reflect response to previous drought and sustained low use.
BAWSCA Agencies Rely on Regional Water System for T wo-Thirds of Their T otal Water Supply
Source: BAWSCA FY 2022-23 Annual Survey
BAWSCA agencies
Purchase two-thirds of
the water supplied by
the Regional Water
System
And they pay two-thirds
of the costs of the
Regional Water System
Other Sources
27.40 mgd, 15.5%
Groundwater
18.44 mgd, 10.4%
SF RWS
Customary
Purchases
117.91 mgd, 66.8%
Surface Water
5.79 mgd, 3.3%
FY 2022-23
BAWSCA
Total Supply
176.64 mgd
SF RWS
In Lieu Water
0 mgd, 0%
Recycled
7.10 mgd, 4.0%
BAWSCA Agencies Project More Investment in Conservation and Other Supplies + RWS Purchases to Meet Future Customer Needs Source: BAWSCA FY 2022-23 Annual Survey
BAWSCA Agencies
project continued
reliance on the Regional
Water System in future.
And they are planning
continued investments
in conservation and
other water supplies to
meet customer needs.
SF RWS
170.49 mgd, 63.8%
Other Sources
40.44 mgd, 15.1%
Groundwater
30.00 mgd, 11.2%
Recycled Water,
17.02 mgd, 6.4%
Surface Water
6.43 mgd, 2.4%
Additional
Conservation
2.84 mgd, 1.1%
FY 2045-46
BAWSCA
Total Projected Supplies:
267.22 mgd
BAWSCA Working for a Reliable Water Supply for Its Member Agencies and Their Water Customers
• BAWSCA Goal: A reliable supply of high-quality water at a fair price • BAWSCA agencies rely on water from San Francisco Regional Water System, which is provided in accordance with San Francisco’s existing obligations
Legal obligations including the 184 mgd Supply Assurance Contractual obligations including meeting Level of Service goals • BAWSCA region’s investments in water use efficiency are reducing water use today • BAWSCA and its member agencies are investing in potential new supplies throughout region • A voluntary agreement for T uolumne River offers a potential to address the needs of T uolumne River fish and water users as an alternative to the adopted Bay-Delta Plan • Water is too valuable to waste - continued wise use of water throughout region is important • BAWSCA and its member agencies actively engaged in several long-term planning studies, including with SFPUC