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also be based on the submetered water use, or alternatively, based upon an allocation formula. There are three different types of these totalcapture submetering systems that can occur: Single point of entry submetering Dual point of entry submetering Point-of-use submetering Single point of entry submetering refers to a system where all of the water enters Figure 1.1 Example of remote registers for submetering a multi-family dwelling unit through a single pipe. This requires that one submeter be installed on the incoming cold water line. This is the simplest and most common type of submetering. Plumbing systems in new construction can usually be designed to incorporate this type of submetering if specified. Dual point of entry submetering refers to a system where water enters a multi-family dwelling unit through two pipes - one for hot and one for cold water. In this case, two water meters are installed, one on the hot and one on the cold water line. Point-of-use submetering refers to a system where small water meters are installed on the supply line of each water using fixture and appliance in a multi-family dwelling unit. Each unit may be equipped with between 5 and 20 (or more) water meters. Meter reads are typically accomplished via radio telemetry to a central computer. This approach can be used when it is not possible to install submeters through single or dual point of entry – usually in older or highrise buildings. By the strict definition, a submetered property receives an overall master meter bill from the local water utility, and each unit’s consumption is read, billed, and collected by either the owner or a billing service company. This way, the owner recoups the costs from resident consumption and only pays for the water used in the common areas. A slight variation on this is utility-submetering, where each unit’s consumption is measured and billed directly by the local utility. This is not technically “submetering”, since there is no building master meter, but the effect of sending an individual bill and consumption report to each unit is the same as 6
submetering. With utility-submetering, any common and/or outdoor areas are also individually metered by the utility. Hybrid Metering Hybrid metering, referred to as “hot water hybrid” (HWH) in this report, are billing systems where only the hot (or cold 15 ) water consumption for each unit in a multi-family dwelling is measured. Figure 1.2 shows an example of a hot water hybrid. This information is then typically used to extrapolate the total water bill in one of three ways. Under the first method the percentage of hot water used per dwelling unit is calculated (Unit A hot water use ÷ sum of all hot water use = Unit A%). The total (hot and cold) water use at the dwelling unit is calculated by multiplying the percentage per dwelling unit by the total residential demand from the utility bill (Unit A% X total use = Unit A total use). The second method estimates cold water usage using one of the standard RUBS allocation formulas (see below). The cold water allocation is added to the hot water measurement to determine the total use. The third method simply applies a standard multiplier to the hot water use to calculate total use in the unit (Unit A hot water use X 2.5 or other standard multiplier = Unit A total use). Often, but not always, a portion of the total master meter bill is paid by the owner, to account for common area usage, irrigation, administrative offices, etc. Figure 1.2 Example of a hot water hybrid meter setup 15 Cold water hybrid systems appear uncommon 7
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NATIONAL MULTIPLE FAMILY SUBMETERIN
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CONTENTS LIST OF TABLES............
Page 5 and 6:
Matched-Pair Analysis .............
Page 7 and 8: LIST OF TABLES Table ES.1.1 Breakdo
Page 9: Table 6.6 Elasticity values, analys
Page 12 and 13: Figure 4.30 RUBS water bill #6 ....
Page 14 and 15: investigated local water savings as
Page 16 and 17: We are grateful to the members of a
Page 18 and 19: quantitative aspects of separate bi
Page 20 and 21: 3. Owner/postcard survey: To identi
Page 22 and 23: "averages" of impact property water
Page 24 and 25: in-rent properties, others used the
Page 26 and 27: of these models included the billin
Page 28 and 29: 70 Average Annual Water Use Per Uni
Page 30 and 31: COSTS AND BENEFITS Beyond quantifyi
Page 32 and 33: service charge, then the resident w
Page 34 and 35: Billing Method Efficient Fixtures?
Page 36 and 37: 70 Avg. Water Use per MF Unit (kgal
Page 38 and 39: REGULATORY FRAMEWORK REVIEW The fra
Page 40 and 41: Table ES.1.12 NSUAA Summary of Stat
Page 42 and 43: above, the researchers offer the fo
Page 44 and 45: service is preferable, and would he
Page 46 and 47: practices (BMPs) should be implemen
Page 48 and 49: infrastructure of the building and
Page 50: multi-family housing. The transfer
Page 53 and 54: CHAPTER 1 INTRODU CTION More and mo
Page 55 and 56: In 1998, 15.0%, or 15.4 million, of
Page 57: TERMINOLOGY AND DEFINITIONS OF BILL
Page 61 and 62: all the two bedroom units for $20 p
Page 63 and 64: HOW TO USE THIS REPORT This report
Page 67 and 68: CHAPTER 2 LITERAT URE REVIEW As the
Page 69 and 70: A review of the literature unearthe
Page 71 and 72: The price elasticity of water deman
Page 73 and 74: expected. Additionally, McClelland
Page 75 and 76: submetered and five control (in-ren
Page 77 and 78: Another study might want to target
Page 81 and 82: CHAPTER 3 RESEARC H METHODS, APPROA
Page 83 and 84: 1. Selection of participating study
Page 85 and 86: STUDY SITE SELECTION The Study aime
Page 87 and 88: Figure 3.2 National Multiple Family
Page 89 and 90: Matched pair protocol/survey - conf
Page 91 and 92: information given the available bud
Page 93 and 94: survey. Service companies that prov
Page 95 and 96: in “business to business” calli
Page 97 and 98: MATCHED PAIR SAMPLE The purpose of
Page 99 and 100: The second part of the visit requir
Page 101 and 102: epresentative of a known population
Page 103 and 104: 51 Table 3.7 Postcard survey statis
Page 105 and 106: Table 3.8 Comparison of annual wate
Page 107 and 108: postcard survey. Nevertheless, exam
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confidence interval ranged from 49.
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particular property (e.g., the mont
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State PUC officials - water commiss
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10. The PROPID number appearing on
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These costs represent the commodity
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The postcard survey provided inform
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Table 4.4 Average number of units f
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Two-thirds of the properties that r
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Percent of Surveyed Properties with
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$700 Average Rent Per Bedroom ($) $
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Percent of Surveyed Properties with
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Impact properties were also more li
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Table 4.8 Issues considered before
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Percent of Surveyed Impact Properti
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60% Percent of Surveyed Properties
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From the visits, it was found that
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100% Percent of Surveyed Residents
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Roughly similar proportions of resi
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inserts for toilets (21%) or low-fl
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proportion were unsure, 37% from su
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Table 4.18 Ownership and rental rat
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Figure 4.17 Submeter water bill #1
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Page 156 and 157:
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wastewater rates are not shown so t
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Figure 4.23 Hot water hybrid water
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RUBS Sample Bills Seven sample RUBS
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wastewater rates are not shown so t
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Figure 4.28 RUBS water bill #4 from
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Figure 4.30 RUBS water bill #6 RUBS
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directly to and then paid by the th
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never subtracting for common area w
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Late Fees At the start of water bil
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124
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intuitively clear, and matches comm
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Indoor water use was normalized on
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Table 5.3 Summarized water use anal
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easonable assumption since there is
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Figure 5.1 shows the frequency dist
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40 Difference in Annual Water Use p
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after 1995. By including only those
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70 Average Annual Water Use Per Uni
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Table 5.11 Statistical tests compar
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Factors that Influence Water Use Th
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Table 5.12 Association of categoric
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Indoor Water Use per Unit in 2001 I
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Table 5.13 Continuous factors from
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Multivariate Models to Determine Im
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properties built before 1995 were c
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70 Average Annual Water Use Per Uni
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A = Beta coefficient for “Propert
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substantially reduces the sample si
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Table 5.17 Model #2 coefficients an
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0.00 indicating that whatever fit d
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commodity charge for water and wast
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properties having generally lower w
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110 Average Annual Water Use Per Un
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analysis, intended to control best
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Table 5.27 Paired samples test, all
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Table 5.30 Estimated water use befo
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Table 5.33 Comparison of water savi
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180
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sector only reduced usage by 18% (A
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Table 6.1 Avoided costs from submet
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submetered. Complete responses of c
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included in this cost/benefit analy
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Table 6.3 Cost and benefit for owne
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Perceived Concerns In the resident
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With a service fee, residents could
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Table 6.4 Economic return for a res
Page 250 and 251:
ANALYSIS OF PRICE ELASTICITIES Econ
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concluded that if a single elastici
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esults from this analysis point to
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over which they have control than d
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According to the basic consumer cho
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The consumer choice problem can be
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210
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water systems from compliance with
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and methods of practice. NIST publi
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Table 7.1 NSUAA Summary of State Re
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New Surveys of State Agencies and W
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the AWWA WaterStats 1999 database.
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Measures, which dispatches a public
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Mississippi, Missouri, Pennsylvania
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226 Table 7.6 Summary of utility re
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DISCUSSION - KEY EXAMPLES OF STATE
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ill. Condominium associations are g
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under construction after January 1,
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Weights and Measures Regulation In
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from the submetering. Meter testing
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clean and decent housing or the lac
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240
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NATIONAL ORGANIZATIONAL STRUCTURE F
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complaints in all 50 states and app
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- Meters must demonstrate in testin
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- Plumbing systems are space constr
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(2) Twisted or kinked flex supply l
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252
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Estimated Water Use By Different Bi
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there are clear benefits to these s
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study site. These values were then
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immediately strengthens the owner's
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among the nation's key strategies f
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all repair and replacement decision
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These findings underscore the obser
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varies with volume of use) for mult
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Recommendation 6 - Efficient plumbi
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financially responsible for their o
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individual unit, the volume allocat
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RECOMMENDATIONS FOR FURTHER RESEARC
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Fixed rates - Part of a master mete
Page 332 and 333:
Total-capture submetering - a type
Page 334 and 335:
282
Page 336 and 337:
Corral, L.R. 1997. Price and Non-Pr
Page 338 and 339:
McClelland, L. 1980. Encouraging En
Page 340:
Young, C.E., K.R. Kinsley and W.E.
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