Water Efficiency Update
23
Water Efficiency Update Board of Directors/ Communications and Water Efficiency Committee November 17, 2021
Transcript of Water Efficiency Update
Water Efficiency UpdateBoard of Directors/ Communications and Water Efficiency Committee
November 17, 2021
OverviewReview Intertie Draft PrinciplesEstablishing Long Term Water Use Targets
• Goals for Selecting a Conservation Target• Marin Water’s Per Capita Water Use• Identify Range of Potential Conservation Targets• Benchmark Water Use Against Several Metrics• Discuss and Select a Long-Term Conservation Target
Informational Residential Water Budgets
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Review of Policy Principles
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Draft Principles For Operation of The Intertie
• The intertie shall be used to prevent a water shortage emergency as defined in District Code section 13.02.015 or any other emergency situation (such as a major seismic event) that threatens the ability of the District to supply sufficient water to meet the health and safety of its customers.
• Water Transfers should only be considered if the District has maximized or planned to maximize all local resources, including but not limited to all available water resources from Sonoma Water, such as including winter water and potential future groundwater and groundwater storage options.
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Draft Principles For Operation of The Intertie
• The District shall implement and maintain a water efficiency and conservation program designed to achieve both:
1. XX% overall reduction in water use, equivalent to XX gallons-per-capita-per-day over the next 10 yrs.
2. YY% overall reduction in residential water use, equivalent to YY residential gallons-per-capita-per-day over the next 10 yrs.
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Draft Principles For Operation of The Intertie
• Prioritization of transfer water sources shall be based on:1. Sustainable practices of water supplier including financial investment in
protection of aquatic species and associated ecosystems.2. Transfer water sources that have been declared surplus and would
otherwise be consumptively used.
• The operation of the intertie shall not adversely affect the operations of any public agency partner.
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Establishing Long Term Water Use Targets
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Considerations for Selecting a Long-Term Conservation Target• Be achievable
• Benchmark against MMWD’s historical minimum use• Benchmark against achieved usage by other agencies
• Select target on a per capita basis, independent of population change• Set target relative to “non-drought” use levels• Evaluate a range of options and decide how much of a “reach” is
appropriate• Ten year target – through 2030
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System Wide per Capita Water Use 2000-2020
0
20
40
60
80
100
120
140
160
180
172,000
174,000
176,000
178,000
180,000
182,000
184,000
186,000
188,000
190,000
192,000
194,000
GPC
D
Popu
latio
n
Population GPCD
Average of 2017, 2018, 2019 consumption from California DWR, based on annual reported data (eAR)
0
50
100
150
200
250
300
350
San
Gabr
iel V
alle
y W
ater
Com
pany
Lynw
ood
City
of
McK
inle
yvill
e Co
mm
unity
Ser
vice
Dist
rict
Gold
en S
tate
Wat
er C
ompa
ny -
Bell-
Bell
Gard
ens
Gold
en S
tate
Wat
er C
ompa
ny S
San
Gab
riel
Cres
cent
City
Calif
orni
a W
ater
Ser
vice
Com
pany
Visa
liaGo
leta
Wat
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istric
tM
arin
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ast W
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Dist
rict
Valle
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Com
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Art
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outh
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Calif
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vice
Com
pany
Sal
inas
Dist
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Pitt
sbur
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ity O
fSe
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each
City
of
Valle
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Wat
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onte
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City
Of
Arro
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rand
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fGo
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mm
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Bea
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ntin
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Bea
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shua
Bas
in W
ater
Dist
rict
Hesp
eria
Wat
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t City
of
Mes
a W
ater
Dist
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Mar
in W
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San
Dieg
uito
Wat
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istric
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ntra
Cos
ta W
ater
Dist
rict
Subu
rban
Wat
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yste
ms S
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Dist
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lifor
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Subu
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City
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City
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City
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City
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Wat
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Dist
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City
of
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City
of
Sant
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ervi
ce C
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Cala
vera
s Cou
nty
Wat
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lifor
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Wat
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ervi
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alos
Ver
des
Clov
is Ci
ty o
fRi
vers
ide
High
land
Wat
er C
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est V
alle
y W
ater
Dist
rict
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orni
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Com
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ervi
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sevi
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of
Sant
a Cl
arita
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utho
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hall
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sion
Sant
a Cl
arita
Val
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Wat
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New
hall
Divi
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Bake
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Cou
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Dist
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9 - M
alib
u &
…Sa
nta
Clar
ita V
alle
y W
ater
Aut
horit
y N
ewha
ll Di
visio
n
Per C
apita
Dem
and
(GPC
D)
Total Per Capita - California
MMWD’s Per Capita Use is in the Middle of the Pack
Per Capita Water Use from 2010-2020
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MMWD, 124
NMWD, 119
Santa Rosa, 99
Petaluma, 107
Sonoma, 166
San Francisco, 76
BAWSCA, 106
EBMUD, 121
40
60
80
100
120
140
160
180
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Per C
apita
Pot
able
Wat
er U
se (G
PCD)
MMWD NMWD Santa Rosa Petaluma Sonoma San Francisco BAWSCA Agencies EBMUD
Range of Potential Conservation Targets
Reduction from 2020 GPCD
Per Capita Potable Water
Use (GPCD) Comments
Baseline 124 2020 GPCD
5% 118 Consistent with current GPCD for NMWD, Windsor
10% 112 Consistent with Regional Average (113 GPCD, Sonoma-Marin)
15% 105 Consistent with MMWD’s minimum GPCD in 2016
20% 99Consistent with 2020 Santa Rosa GPCD, aligns with current (through Oct. 2021 consumption) GPCD
25% 93 Below 2021 GPCD
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Per Capita Water Use from 2010-2020
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MMWD, 124
NMWD, 119
Santa Rosa, 99
Petaluma, 107
Sonoma, 166
San Francisco, 76
BAWSCA, 106
EBMUD, 121
40
60
80
100
120
140
160
180
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Per C
apita
Pot
able
Wat
er U
se (G
PCD)
MMWD NMWD Santa Rosa Petaluma Sonoma San Francisco BAWSCA Agencies EBMUD
20%99 GPCD
25%93 GPCD
Change in Per Capita Water Use from 2010 to 2020
• Greatest reduction over 10-year period was 20%
• MMWD minimum was 105 GPCD in 2016
• Min use from 2010-2020 in was 84 GPCD (Santa Rosa in 2015)
Agency
Potable Water Use (GPCD)
Minimum (2010-2020) 2010 2020
Change 2010-2020
(%)MMWD 105 124 124 0.03%Sonoma 126 148 166 12%VOMWD 87 98 102 4.1%Santa Rosa 84 103 99 -4.0%EBMUD 106 130 121 -7.1%Petaluma 105 117 107 -8.5%NMWD 107 134 119 -12%BAWSCA 94 130 106 -19%SFPUC 75 95 76 -20%
Change in Per Capita Water Use – Current Drought
• Through August, MMWD’s GPCD has been reduced by 23%, a new historical low
Agency
Potable Water Use (GPCD)Minimum
(2010-2020)
2020Change
2010-2020 (%)
2021 thru August
Change 2020-2021
(%)MMWD 105 124 0.03% 96 -23%Sonoma 126 166 12% 143 -14%VOMWD 87 102 4.1% 94 -8%Santa Rosa 84 99 -4.0% 92 -7%EBMUD 106 121 -7.1% 118 -2%Petaluma 105 107 -8.5% 110 3%NMWD 107 119 -12% 103 -13%SFPUC 75 76 -20% 67 -12%
Average of 2017, 2018, 2019 consumption from California DWR, based on annual reported data (eAR)
0
50
100
150
200
250
300
350Sa
n Ga
brie
l Val
ley
Wat
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Com
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City
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Wat
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Sou
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City
Calif
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City
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ms W
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burb
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ater
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Com
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burb
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City
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ater
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Wat
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Vent
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Dist
rict
Pow
ay C
ity o
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nta
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garit
a W
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Dist
rict
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ater
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rovi
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rba
Lind
a W
ater
Dist
rict
Disc
over
y Ba
y Co
mm
unity
Ser
vice
s Dist
rict
Rose
ville
City
of
Bann
ing
City
of
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en S
tate
Wat
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ova
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ity o
fSa
nta
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ita V
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ater
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horit
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ewha
ll Di
visio
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ita V
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ater
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horit
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ewha
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visio
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kers
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Of
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Mon
teci
to W
ater
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rict
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ngel
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ater
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ks D
istric
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- Mal
ibu
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Sant
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arita
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Wat
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utho
rity
New
hall
Divi
sion
Per C
apita
Dem
and
(GPC
D)
Total Per Capita - California
25%93 GPCD
20%99 GPCD
Historical GPCD and Potential Targets
• Baseline shown is the 2020 UWMP population projections
• 2021 (through August) is 96 GPCD, a new historical low
• Exceeds a 20% target• Some post drought rebound is
expected
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Baseline (UWMP), 117 GPCD
20%, 99 GPCD
25%, 93 GPCD
50
70
90
110
130
150
2005 2010 2015 2020 2025 2030 2035Po
tabl
e Pe
r Cap
ita D
eman
d (G
PCD)
Potential Conservation Targets, Baseline, and Historical GPCD
Historical Baseline (UWMP), 117 GPCD
20%, 99 GPCD 25%, 93 GPCD
Axis truncated to show detail
*2021 GPCD reflects use through August 2021
Informational Residential Water Budgets
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Informational Residential Water Budgets Contract signed with consultant to develop informational residential water budgets Indoor budgets options: fixed at 5,000 gallons/month; reported number of bedrooms parcel records; average indoor gallons/day/resident (or connection)
Outdoor budget options: irrigable area allowed x gallons per square foot (gpsf); allowed gpsf may be reduced as landscape size increases
Informational Water Budgets will be complete in January.
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20
Flume Indoor Water Use Data
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Next Steps
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Next Steps
• Incorporate input to Intertie Draft Principles• Select long-term conservation target • Water Efficiency Master Plan will be developed to meet long-
term conservation target• Develop R-GPCD goals• Finalize informational water budgets for residential
customers
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