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include drop-down lists and radio buttons. These allow the user to select varios options or
the bottom of each calculator is a hyperlink that when clicked will open your web browser a
website page with information on the BMP's coverage requirement. This will only work if (1
Excel recognizes and (2) you have an internet service provider. ANY CHANGES YOU MAK
UNLESS YOU SAVE YOUR CHANGES TO THE FILE. SAVE YOUR FILE OFTEN TO AV
LOSS.
Your Agency's Base Year
The calculator for BMP 1 requires you to enter the number of single-family and multi-family
Base Year. Similarly, the calculator for BMP 9 requires you to enter the number of CII aco
Year. Your agency's Base Year is as follows:
Agencies signing MOU Prior to 1997: Base Year = 1997
Agencies signing MOU After 1997: Base Year = Year Agency Signed MOU
BMP Calculator Instructions
Go to BMP 1 Coverage Calculator
Go to BMP 2 Coverage Calculator
Go to BMP 4 Coverage Calculator
Go to BMP 5 Coverage Calculator
Go to BMP 9 Coverage Calculator
Go to BMP 9 CII ULFT Coverage Calc
Go to BMP 14 Coverage Calculator
4. Enter the number of single-family and multi-family housing units in your service area con
5. Enter the annual rate of housing demolition for the pre1992 housing stock.
6. Enter the percent of pre1992 housing units that were constructed before 1/1/1980.
7. Enter the average number of persons per household.
8. Enter the average number of toilets per household.
9. Enter the average rate of toilet replacement, as a percent of the existing stock of high-flo
The calculator will determine the total acre-feet your ULFT program must save to be consid
Retrofit-On-Resale requirement using the methodology presented in Exhibit 6 of the MOU.
effectiveness of a Retrofit-On-Resale requirement by year can be printed by clicking the "P
bottom of the calculator.
ABOUT THIS TOOL...
What is this?
This is a tool to help a water supplier calculate the coverage requirements for BMPs 1,2,4,5,9, and 14 according to the
Requirements set forth in Exhibit 1 of the Memorandum of Understanding Regarding Urban Water Conservation in
California (MOU). These calculators were developed by the California Urban Water Conservation Council.
What this is not.
These calculators are not designed to estimate an agency's BMP implementation relative to the coverage requirement.
They only show the coverage requirement, given agency-determined parameters for each BMP. The results, however, can
be used to determine if an agency's implementation of a BMP is on schedule to meet the coverage requirement within the
time specified by Exhibit 1 of the MOU.
General comments about using the calculators
You can only enter data in cells with white backgrounds. Cells with yellow backgrounds are calculation cells determined
by spreadsheet formulas. You cannot enter data into these cells, nor can you alter their contents. Some calculators also
include drop-down lists and radio buttons. These allow the user to select varios options or settings for the calculator. At
the bottom of each calculator is a hyperlink that when clicked will open your web browser and take you to the CUWCC
website page with information on the BMP's coverage requirement. This will only work if (1) you have a web browser that
Excel recognizes and (2) you have an internet service provider. ANY CHANGES YOU MAKE TO THIS FILE WILL BE LOST
UNLESS YOU SAVE YOUR CHANGES TO THE FILE. SAVE YOUR FILE OFTEN TO AVOIDED UNEXPECTED DATA
LOSS.
Your Agency's Base Year
The calculator for BMP 1 requires you to enter the number of single-family and multi-family housing units for your agency's
Base Year. Similarly, the calculator for BMP 9 requires you to enter the number of CII acounts for your agency's Base
Year. Your agency's Base Year is as follows:
Agencies signing MOU Prior to 1997: Base Year = 1997
Agencies signing MOU After 1997: Base Year = Year Agency Signed MOU
BMP Calculator Instructions
BMP 1
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 1 implementation is expected to commence.
2. Enter the number of single-family and multi-family housing units in your service area for the Base Year.
The calculator will determine the number of surveys your agency is expected to complete within 10 years from the date
implementation is expected to commence. The calculator will also show the number of surveys that must be completed
by each reporting period for your agency to be considered on schedule to meet the coverage requirement within 10 years.
BMP 2
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 2 implementation is expected to commence.
2. Enter the number of single-family and multi-family housing units in your service area constructed prior to 1992.
3. Indicate whether an enforceable ordinance requiring the replacement of high-flow showerheads with low-flow
showerheads is in effect in your agency's service area.
4. Indicate whether your agency has determined that 75% of the single-family and/or multi-family housing units in your
service area are fitted with low-flow showerheads.
The calculator will indicate if and how many low-flow showerheads your agency is required to distribute each reporting period.
BMP 4
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 4 implementation is expected to commence.
2. Enter the number of unmetered accounts in your service area as of the year indicated.
The calculator will determine the minimum number of meter retrofits required each reporting period to be considered on
schedule to meet the coverage requirement in 10 years.
BMP 5
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 5 implementation is expected to commence.
2. Enter the number of CII accounts with dedicated landscape meters as of the year indicated. The calculator will
determine the number of accounts your agency is to provide ETo-based water use budgets by the year indicated.
3. Indicate if agency has program to retrofit mixed-use CII accounts with irrigation meters.
4. Enter the number of CII accounts with mixed-use meters for the year indicated. The calculator will determine the
number of landscape surveys to be offered to these accounts each reporting period, and will calculate the number of
surveys to be completed by each reporting period for your agency to be considered on schedule to meet the coverage
requirement within 10 years.
BMP 9
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 9 implementation is expected to commence.
2. Choose the compliance option and enter the requested data.
This calculator will determine the coverage requirement for each BMP 9 compliance option. NOTE THAT THE MOU
DOES NOT REQUIRE AN AGENCY TO COMPLY WITH BOTH OPTIONS. An agency can select different options for
different CII sectors or to combine the two options for the same sector. THE CALCULATOR ONLY DETERMINES THE
COVERAGE UNDER THE SIMPLE CASE WHERE AN AGENCY SELECTS ONE OR THE OTHER OPTION FOR ALL CII
ACCOUNTS. Clicking the button at the bottom of the calculator will give the user additional information about combining
the coverage options.
BMP 9 - CII ULFT Coverage
This is a prototype calculator based on the draft Exhibit 8. Agencies can use this calculator to determine the implications
of Exhibit 8 as currently proposed. You will need a count of high-flow toilets by CII subsector to use this calculator. Zip-code
level toilet counts by CII subsector can be obtained from the CUWCC for $10 per zip code. You can use the zip-code level
counts to develop a count for your service area. Contact the CUWCC if you require assistance doing this. If you are
providing your own count using Exhibit 8 tables, exclude post-1994 construction. Exhibit 8 assumes CII facilities
constructed after 1994 have ULFTs. If these facilities are included in the count, the calculator will over estimate Total
Savings Potential. Don't adjust the toilet count for natural replacement of toilets between the year of the count and the
year your agency would need to start implementing the BMP. The calculator does this automatically. If you also do it, the
calculator will under estimate Total Savings Potential. Total Savings Potential is based on the ULFT savings estimates
presented in the draft Exhibit 8. Savings for the Retail/Wholesale sector is the average of the savings estimate for retail
establishments and the savings estimate for wholesale establishment. Similarly, savings for the Gov't sector is the average
of the four government sectors listed in Table 5 of Exhibit 8.
BMP 14
1. Use the spinner to the right of "Year Agency Signed MOU" to set the year your agency signed the MOU. The calculator
will then determine the latest year BMP 14 implementation is expected to commence.
2. Indicate whether the calculator should use water savings estimates derived from Exhibit 6 of the MOU or your own
estimates. If you select the "User Supplied" radio button, a dialog box will appear asking you to provide the estimates. If
you later wish to change these estimates, select the "User Supplied" radio button again (even if it is already selected) and
the dialog boxes will appear again.
3. Indicate whether the calculator should use county-average resale rate estimates or user provided estimates. If you select
the "User Supplied" radio button, a dialog box will appear asking you to provide the estimates. If you later wish to change
these estimates, select the "User Supplied" radio button again (even if it is already selected) and the dialog boxes will
appear again. If you select "County Average" you must choose the county using the drop-down list to the right of the radio
button. Estimates are not available for every county. If an estimate is not available for your county, you can choose a
neighboring county or use the state average.
4. Enter the number of single-family and multi-family housing units in your service area constructed prior to 1/1/1992.
5. Enter the annual rate of housing demolition for the pre1992 housing stock.
6. Enter the percent of pre1992 housing units that were constructed before 1/1/1980.
7. Enter the average number of persons per household.
8. Enter the average number of toilets per household.
9. Enter the average rate of toilet replacement, as a percent of the existing stock of high-flow toilets.
The calculator will determine the total acre-feet your ULFT program must save to be considered "At least as effective as" a
Retrofit-On-Resale requirement using the methodology presented in Exhibit 6 of the MOU. A schedule showing the
effectiveness of a Retrofit-On-Resale requirement by year can be printed by clicking the "Print Schedule" button at the
bottom of the calculator.
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BMP 1 Coverage Calculator Instructions
Agency Name Lost Drops MWD
Year Agency Signed MOU 1995
Latest Year BMP 1 Implementation to Commence 1998
Single Multi
Family Family
Units Units
Number of Housing Units in Service Area in 1997 200,000 150,000
Single Multi
Number of surveys Lost Drops MWD is to complete by 2008 Family Family
Units Units
Cumulative Total (15% of Base Year Housing Units) 30,000 22,500
10-Year Annual Average 3,000 2,250
Lost Drops MWD is on schedule to satisfy coverage Single Multi
requirement if it has completed the indicated number of Family Family
surveys for each year shown Units Units
2000 3,000 2,250
2002 7,200 5,400
2004 12,600 9,450
2006 19,200 14,400
2008 27,000 20,250
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 2 Coverage Calculator Instructions
Agency Name Agency Name
Year Agency Signed MOU 1991
Latest Year BMP 2 Implementation to Commence 1998
Single Multi
Family Family
Units Units
Housing Units in Service Area Constructed Before 1/1/1992 200,000 100,000
Is an Enforceable Retrofit Ordinance in Effect in Service Area?No No
Has Agency Demonstrated 75% Saturation? No No
Single Multi
Family Family
Units Units
Number of low-flow showerheads Agency Name expected
20,000 10,000
to distribute each report period. (10% of Pre1992 Housing)
Average Annual Number of Showerheads 10,000 5,000
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 4 Coverage Calculator Instructions
Agency Name Lost Drops MWD
Year Agency Signed MOU 1991
Latest Year BMP 4 Implementation to Commence 1999
Number of Unmetered Accounts as of 1999 10,000
Average Annual Number Retrofits Necessary to Meet Coverage
1,000
Requirement
Lost Drops MWD is on schedule to satisfy coverage requirement if it has retrofitted
the indicated number of unmetered accounts by year indicated
2001 1,000
2003 2,400
2005 4,200
2007 6,400
2009 9,000
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 5 Coverage Calculator Instructions
Agency Name Agency Name
Year Agency Signed MOU 1991
Latest Year BMP 5 Implementation to Commence 1999
Accounts with Irrigation Meters
Number of CII Accounts with Dedicated Irrigation Meters in 1997 4,500
Number of CII Accounts with Dedicated Irrigation Meters Expected to
4,050
have ETo-Based Water Use Budgets by 2003
Accounts with Mixed Use Meters
Does your agency have a program to retrofit mixed-use accounts with
dedicated landscape accounts, or a program giving mixed-use accounts No
ETo-based budgets for irrigation uses?
Number of CII Accounts with Mixed Use or No Meter as of 1997 5,000
Number of Landscape Water Use Surveys to be Offered Each Report 1,000
Period
Average Annual Number of Landscape Water Use Surveys to be Offered 500
Agency Name is on schedule to satisfy coverage requirement if it has surveyed the
indicated number of CII accounts with Mixed-Use Meters or Unmetered by year
indicated 2001 75
2003 180
2005 315
2007 480
2009 675
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 Coverage Calculator Instructions
Agency Name Agency Name
Year Agency Signed MOU 1991
Latest Year BMP 9 Implementation to Commence 1999
CII SURVEY AND INCENTIVE PROGRAM OPTION Commercial Industrial Institutional
Accounts Accounts Accounts
Number of CII Accounts in Service Area in 1997 5,000 3,000 1,000
Commercial Industrial Institutional
Number of surveys Agency Name is to complete by 2009
Accounts Accounts Accounts
Cumulative Total (10% of Base Year Accounts) 500 300 100
10-Year Annual Average 50 30 10
Agency Name is on schedule to satisfy the coverage
Commercial Industrial Institutional
requirement for the survey option if it has completed the
Accounts Accounts Accounts
shown number of surveys by year indicated
2001 50 30 10
2003 120 72 24
2005 210 126 42
2007 320 192 64
2009 450 270 90
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 Coverage Calculator Instructions
PERFORMANCE TARGET OPTION
Water Use by CII Accounts in 1997 (AF) 45,000
Agency Name is on schedule to satisfy the coverage requirement for the Performance Target Option
if its CII programs have generated savings (AFY) greater than or equal to the amount shown for the
year indicated.
2001 450
2003 1,080
2005 1,890
2007 2,880
2009 4,050
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 ULFT Coverage Calculator Instructions
Agency Name
Year Agency Signed MOU
Latest Year CII ULFT Implementation to Commence 2001
ENTER CII TOILET CENSUS RESULTS
Year of CII ULFT Census for Agency Service Area 1992
Number of
CII Subsector
Toilets
Offices
Retail/Wholesale
Hotels
Health
Other
Industrial
Schools: K to 12
Eating
Government
Churches
Total -
Estimated Rate of CII Toilet Turnover (percent of remaining stock per year) 4.0%
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 ULFT Coverage Calculator Instructions
DETERMINE CII ULFT TOTAL SAVINGS POTENTIAL
School Subsector Savings (gallons per day per ULFT) Click for Explanation 18
10-Year Total
Savings
Potential: 2001 -
CII Subsector 2010
Offices -
Retail/Wholesale -
Hotels -
Health -
Other -
Industrial -
Schools: K to 12 -
Eating -
Government -
Churches -
Total -
Based on Exhibit 8 Data and Methods.
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 ULFT Coverage Calculator Instructions
CALCULATE CII ULFT COVERAGE REQUIREMENT
CII ULFT Coverage Requirement (3% of Total Savings Potential) -
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 9 ULFT Coverage Calculator Instructions
ESTIMATE AVERAGE ANNUAL NUMBER OF TOILET
INSTALLATIONS TO SATISFY NET COVERAGE REQUIREMENT
Note: This calculation is based on average savings of 0 gallons per day per ULFT.
It may be possible to reduce the number of toilets required to meet the coverage by targeting toilets to
the CII sectors with the highest estimated savings and by installing more toilets early in the program.
Avg. # of Annual Cumulative
Program Installed Savings Savings
INSTRUCTIONS: Year Toilets (AF/Yr) (AF)
1. Click the button to calculate the 2001 85 0.0 0.0
average annual number of toilet 2002 85 0.0 0.0
installations between 2001 and 2003 2003 85 0.0 0.0
needed to satisfy the proposed coverage. 2004 0.0 0.0
2005 0.0 0.0
Calculate Table 2006 0.0 0.0
2007 0.0 0.0
2008 0.0 0.0
2. WARNING: This is an upper-bound estimate of 2009 0.0 0.0
the number of toilets your agency would need to 2010 0.0 0.0
replace each year. An agency could lower this Total Toilets 255
number by targeting toilets to those sectors with
the highest estimated savings and by installing Cumulative Savings Equals Net Coverage
more toilets early in the program. Use the table
below to see how this can be done.
3-YEAR INTERIM PROGRAM SAVINGS TRACKER
Use the table below to record the number of toilets replaced in each CII subsector during each year of the 3-year interim program.
The table will track the cumulative savings and compare it to the coverage requirement schedule. Note, you can also use this table to
examine how targeting particular CII subsectors or frontloading replacements can reduce the total number of toilets needed to meet
the interim coverage requirement. By the end of 2003/04 10-Year Cumulative savings need to be greater than or equal to 3.0% of Total
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 14 Coverage Calculator Instructions
Agency Name Lost Drops MWD
Year Agency Signed MOU 1991
Latest Year BMP 14 Implementation to Commence 1998
User Selection - ULFT Savings
Use Exhibit 6 Estimates User Supplied
User Selection - Resale Rate
Use County Average STANISLAUS
User Supplied Single Multi Family
Family Units Units
1. Number Housing Units in Service Area Constructed Before
500 500
1/1/1992
2. Estimated annual rate of housing demolition (or conversion) 0.50% 0.50%
3. Percent of Pre1992 Housing Units Constructed Prior to 1/1/1980 50% 50%
4. Average Number of Persons Per Household 3.00 3.00
5. Average Number of Toilets Per Household 2.00 2.00
6. Average rate of toilet replacement due to toilet failure or remodeling 4.00% 4.00%
7. Average rate of resale 3.71% 6.24%
Estimated Housing Units with 3.5+ gpf Toilets in 1998 392 392
Estimated Savings per Housing Unit (gallons per day) 38.28 54.73
Lost Drops MWD Coverage Requirement by 2008 is 75 AF.
CALCULATE CREDIT FOR AGENCY-ASSISTED ULFT REPLACEMENTS
OCCURING PRIOR TO ADOPTION OF REVISED BMP 14 IMPLEMENTATION SCHEDULE
Intructions: Click the button below to create a table that will calculte how much progress your agency has made towards meeting
the coverage requirement for BMP 14. You will also be able to estimate the number of toilets your agency would need to replace
in the future to fully satisfy the coverage requirement. Beware, however, that this estimate does not optimize the toilet replacement schedule.
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 14 Coverage Schedule for Lost Drops MWD
Single Family Multi Family
1992 housing stock 500 500
Average rate of natural replacement (% of remaining stock) 4.0% 4.0%
Average rate of housing demolition (% of remaining stock) 0.50% 0.50%
Estimated Housing Units with 3.5+ gpf Toilets in 1998 392 392
Average resale rate 3.7% 6.2% <-- Based on 1996 - 1998 Avg. Resale Rate for STANISLAUS County.
Average persons per unit 3.00 3.00
Average toilets per unit 2.00 2.00
Percent of 1992 housing stock with pre 1980 toilets 50% 50%
Average savings per home (gpd) 38.28 54.73 <-- Based on Exhibit 6 Data and Methods
Single Family Units
Retrofit Resale Ordinace In Effect Natural Replacement Only
Remaining Sold and Gross water Remaining NOC Cumulative
unretrofitted Sold and already Unsold and savings unretrofitted Savings Net Savings Net Savings
Year units Units sold Units unsold retrofitted retrofitted retrofitted (AFY) units (AFY) (AFY) (AF)
1998 392 4.64 392 4.64 - -
1999 362 14 375 14 - 15 6 376 5 1 1
2000 335 14 374 13 1 14 7 361 6 1 2
2001 310 14 372 12 2 13 8 347 7 2 3
2002 287 14 370 11 3 12 9 333 7 2 5
2003 265 14 368 11 4 11 10 320 8 2 8
2004 245 14 366 10 4 10 11 307 8 3 10
2005 227 14 364 9 5 9 12 295 9 3 13
2006 210 14 362 8 6 9 12 283 9 3 16
2007 194 14 361 8 6 8 13 272 10 3 20
2008 179 14 359 7 7 7 14 261 10 4 23
2009 166 14 357 7 7 7 14 251 11 4 27
2010 153 14 355 6 8 6 15 241 11 4 31
2011 142 14 354 6 8 6 15 231 12 4 34
2012 131 14 352 5 8 5 16 222 12 4 38
2013 121 13 350 5 9 5 16 213 12 4 42
2014 112 13 348 4 9 5 17 205 13 4 46
2015 104 13 347 4 9 4 17 196 13 4 50
2016 96 13 345 4 9 4 17 189 13 4 54
2017 89 13 343 4 10 4 18 181 14 4 58
2018 82 13 341 3 10 3 18 174 14 4 62
2019 76 13 340 3 10 3 18 167 14 4 66
2020 70 13 338 3 10 3 18 160 15 4 70
2021 65 13 336 3 10 3 19 154 15 4 74
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BMP 14 Coverage Schedule for Lost Drops MWD
Single Family Multi Family
1992 housing stock 500 500
Average rate of natural replacement (% of remaining stock) 4.0% 4.0%
Average rate of housing demolition (% of remaining stock) 0.50% 0.50%
Estimated Housing Units with 3.5+ gpf Toilets in 1998 392 392
Average resale rate 3.7% 6.2% <-- Based on 1996 - 1998 Avg. Resale Rate for STANISLAUS County.
Average persons per unit 3.00 3.00
Average toilets per unit 2.00 2.00
Percent of 1992 housing stock with pre 1980 toilets 50% 50%
Average savings per home (gpd) 38.28 54.73 <-- Based on Exhibit 6 Data and Methods
Multi Family Units
Retrofit Resale Ordinace In Effect Natural Replacement Only
Remaining Sold and Gross water Remaining NOC Cumulative
unretrofitted Sold and already Unsold and savings unretrofitted Savings Net Savings Net Savings
Year units Units sold Units unsold retrofitted retrofitted retrofitted (AFY) units (AFY) (AFY) (AF)
1998 392 7 392 7 - -
1999 353 24 366 24 - 15 9 376 8 1 1
2000 318 24 364 22 2 13 11 361 9 3 4
2001 286 24 362 20 4 12 13 347 9 4 8
2002 258 24 360 18 6 11 15 333 10 5 12
2003 232 24 358 16 8 10 16 320 11 5 18
2004 209 24 357 14 9 9 18 307 12 6 24
2005 188 24 355 13 11 8 19 295 13 7 30
2006 170 24 353 12 12 7 20 283 13 7 37
2007 153 23 351 11 13 6 21 272 14 7 45
2008 137 23 349 9 14 6 22 261 15 8 52
2009 124 23 348 9 15 5 23 251 15 8 60
2010 112 23 346 8 15 5 24 241 16 8 68
2011 100 23 344 7 16 4 24 231 16 8 76
2012 90 23 343 6 17 4 25 222 17 8 84
2013 81 23 341 6 17 3 26 213 18 8 92
2014 73 23 339 5 18 3 26 205 18 8 100
2015 66 22 337 5 18 3 27 196 19 8 108
2016 59 22 336 4 18 2 27 189 19 8 116
2017 54 22 334 4 19 2 27 181 20 8 124
2018 48 22 332 3 19 2 28 174 20 8 132
2019 43 22 331 3 19 2 28 167 20 8 139
2020 39 22 329 3 19 2 28 160 21 7 147
2021 35 22 327 2 19 1 28 154 21 7 154
3/21/2011 CUWCC Coverage Calculator Version: 5d9f3c2f-333a-4fef-97a3-df64c36145a8.xls
BMP 14 Coverage Schedule for Lost Drops MWD
Single Family Multi Family
1992 housing stock 500 500
Average rate of natural replacement (% of remaining stock) 4.0% 4.0%
Average rate of housing demolition (% of remaining stock) 0.50% 0.50%
Estimated Housing Units with 3.5+ gpf Toilets in 1998 392 392
Average resale rate 3.7% 6.2% <-- Based on 1996 - 1998 Avg. Resale Rate for STANISLAUS County.
Average persons per unit 3.00 3.00
Average toilets per unit 2.00 2.00
Percent of 1992 housing stock with pre 1980 toilets 50% 50%
Average savings per home (gpd) 38.28 54.73 <-- Based on Exhibit 6 Data and Methods
Total Units
Retrofit Resale Ordinace In Effect Natural Replacement Only
Remaining Sold and Gross water Remaining NOC Cumulative
unretrofitted Sold and already Unsold and savings unretrofitted Savings Net Savings Net Savings
Year units Units sold Units unsold retrofitted retrofitted retrofitted (AFY) units (AFY) (AFY) (AF)
1998 784 - - - - - 11 784 11 - -
1999 715 39 741 39 - 30 15 753 13 2 2
2000 653 39 737 35 3 27 18 723 14 4 6
2001 596 38 734 32 6 25 21 694 16 5 11
2002 544 38 730 29 9 23 24 666 17 7 18
2003 497 38 726 27 11 21 26 640 19 8 25
2004 454 38 723 24 14 19 29 614 20 9 34
2005 415 38 719 22 16 17 31 590 21 9 44
2006 379 37 715 20 17 16 33 566 23 10 54
2007 346 37 712 18 19 14 34 544 24 11 64
2008 317 37 708 17 20 13 36 522 25 11 75
2009 290 37 705 15 22 12 37 501 26 11 87
2010 265 37 701 14 23 11 39 481 27 12 99
2011 242 37 698 13 24 10 40 462 28 12 110
2012 222 36 694 11 25 9 41 444 29 12 122
2013 203 36 691 10 26 8 42 426 30 12 134
2014 185 36 687 10 26 8 43 409 31 12 146
2015 170 36 684 9 27 7 44 393 32 12 158
2016 155 36 680 8 28 6 44 377 32 12 170
2017 142 35 677 7 28 6 45 362 33 12 182
2018 130 35 674 7 29 5 46 348 34 12 194
2019 119 35 670 6 29 5 46 334 35 11 205
2020 109 35 667 5 29 5 47 321 35 11 216
2021 100 35 664 5 30 4 47 308 36 11 228
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