“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 (Lou Papan-2002)]
BAWSCA Service Area
T om Smegal, BAWCSA
CEO/General Manager
SFPUC Presentation
April 28, 2026
26% Less Water Used T oday in BAWSCA Region Compared
to FY 1986-87 Despite a 35% Population Increase
0.00 0.20
0.40 0.60
0.80 1.00
1.20 1.40
1.60 1.80
2.00 0
50 100
150
200
250
300
Population (Millions)
Million Gallons Per Day (mgd)
Total Water Use Drought Year Population
2/7
Residential Per Capita Has Decreased by 48% in BAWSCA
Region
Peak: 186.5 gpcd
FY 2024-25: 98.0
Peak: 114.9 gpcd
FY 2024-25: 58.9
0 20
40 60
80 100
120
140
160
180
200
1975-76
1982-83
1989-90
1996-97
2003-04
2010-11
2017-18
2024-25
Per Capita Consumption
Gross Per Capita (gpcd) Residential Per Capita (gpcd)Dashed line indicates drought year 3/7
BAWSCA Agencies Rely on Regional Water System for T wo- Thirds of Their T otal Supply
Source: BAWSCA FY 2024-25 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
29.87 mgd, 15.5%
Ground Water
15.36 mgd, 8.0%
SF RWS
Customary Purchases
128.71 mgd, 66.9%
BAWSCA
Total Supply
192.37 mgd
SF RWS
In Lieu Water
4.78 mgd, 2.5%
Recycled
7.40 mgd, 3.8% Surface Water
6.26 mgd, 3.3%
4/7
Demand Projections By Source 2049-50
Source: BAWSCA FY 2024-25 Annual Survey
BAWSCA 2025
Regional Water
Demand &
Conservation Study
SF RWS
148.35 mgd, 61.0%
Other Sources
34.86 mgd, 14.3%
Ground Water
35.55 mgd, 14.6%
Recycled Water
14.64 mgd, 6.0% Surface Water
5.67 mgd, 2.3%
Additional
Conservation
3.97 mgd, 1.6%
FY 2049-50
BAWSCA
Total Projected
Supplies:
243.05 mgd
5/7
Comparing T wo Years Shows Impact of Local Action on Average Daily Residential Water Use (Gallons Per Capita Per Day, gpcd) Source: BAWSCA FY 2024-25 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 79.3 0 5 6 12 3
2024-25 58.9 8 6 8 1 3
• Data shows overall 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. • Stanford not included in residential per capita calculations due to nature of service area. 6/7
Residential Per Capita Consumption Distributed by
Percentage of Population
Source: BAWSCA FY 2024-25 Annual Survey
• 4% of the service
area population
uses 75 gpcd or
more
• 42% of service
area population
uses 55 gpcd or
less
• 58.9 gpcd
average
residential per
capita
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
City of San Jose
City of Palo Alto
City of Mountain View
7/7