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andomly, which could have introduced a bias. Finally, the small sample size precludes the study from being able to apply results to properties in general (Strub 2000). In 1998, the City of Austin Water Conservation Division and Capstone Properties conducted a pilot study that examined the savings gained from submetering hot water heaters in two similar apartment buildings in Austin, Texas. The study included a resident survey that found that if faced with a separate billing measure, the majority of residents preferred metering hot water to various allocation methods. For the first building, analysis showed that submetering positively impacted the residents’ hot water consumption for all tested variables, decreasing water use from 5 to 12% (or 107.7 fewer gallons of hot water per month). However, results from the second building did not show submetering to significantly reduce water consumption. Demographics might help to explain why, since residents in the second building paid slightly higher rent and had higher income than the first. In addition, the submetering method employed only monitored hot water use, therefore rendering it possible for residents to have decreased cold water use, which wouldn’t have been visible from the available data (Strub 2000). Limitations of the study were its small sample size and that some common area water usage was estimated, rather than actually metered, thus potentially over or under stating total resident consumption. Wilcut (2002) performed a study in San Antonio, Texas, which compared water consumption patterns between submetered, bill allocated, and non-allocated multi-family residences. Establishments were classified by lease cost per square foot, date of construction, number of units per establishment, annual occupancy rates, allocation status, average monthly water consumption, and presence or absence of low-flow plumbing fixtures. Researchers identified 15 establishments, 5 properties per billing method. The study was successful in proving three concepts: (1) The introduction of a billing system decreases water consumption. In this study, submetering decreased consumption by about 18.5 gpcd (31.3%), and allocation decreased consumption by 1.6 gpcd (2.7%). (2) The study found that the presence of low-flow fixtures is more important for savings than the method of billing. Regardless of billing method, low-flow toilets and fixtures decreased use by 29.3 gpcd (39%). (3) There is no correlation between cost per square foot for lease space (intended as a proxy for socioeconomic status) and per capita water consumption. One hindrance for this study was the small sample size, thus making the results less significant for generalization purposes. In addition, it was recognized that due to the age of the submetered properties, most were equipped with low-flow fixtures. 24
Another study might want to target RUBS and in-rent properties that have more low-flow fixtures. Also, it was noted that the water rates charged during the study were among the lowest in Texas and the U.S. Mobile home parks have also been targeted for submetering. The impacts of submetering water usage at two mobile home communities were evaluated in the Las Vegas Valley Water District, Nevada. Rosales, Weiss, and DeOreo (2002) reported a monthly water reduction of seven and twelve percent for the two study sites. Overall savings was 4,056 kgal per year from the 388 mobile units, or 10.5 kgal per year per household. The study also utilized flow trace data, which identified the source of savings to be a decrease in domestic water use and repair of leaks. These results were encouraging, and probably conservative, because significant water savings were achieved in communities that already had low baseline use and where retrofits have previously occurred. 25
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NATIONAL MULTIPLE FAMILY SUBMETERIN
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CONTENTS LIST OF TABLES............
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Matched-Pair Analysis .............
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LIST OF TABLES Table ES.1.1 Breakdo
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Table 6.6 Elasticity values, analys
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Figure 4.30 RUBS water bill #6 ....
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investigated local water savings as
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We are grateful to the members of a
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quantitative aspects of separate bi
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3. Owner/postcard survey: To identi
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"averages" of impact property water
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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 and 58: TERMINOLOGY AND DEFINITIONS OF BILL
Page 59 and 60: submetering. With utility-submeteri
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: submetered and five control (in-ren
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
Page 109 and 110: confidence interval ranged from 49.
Page 111 and 112: particular property (e.g., the mont
Page 113 and 114: State PUC officials - water commiss
Page 115: 10. The PROPID number appearing on
Page 118 and 119: These costs represent the commodity
Page 120 and 121: The postcard survey provided inform
Page 122 and 123: Table 4.4 Average number of units f
Page 124 and 125: 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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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
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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
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Total-capture submetering - a type
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282
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Corral, L.R. 1997. Price and Non-Pr
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McClelland, L. 1980. Encouraging En
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Young, C.E., K.R. Kinsley and W.E.
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