national multiple family submetering and allocation billing program ...

40
Difference in Annual Water Use
per Unit Compared to In-Rent (kgal)
30
20
10
0
-10
-20
-30
-8.34
-1.11
-3.60
-40
Submetered
N=273
RUBS
N=595
HWH
N=41
Figure 5.3 Difference in average annual water use compared to in-rent properties –
postcard survey respondents
Manager Survey Respondents
The manager survey response group was considered the best and most reliable for
analysis since it was a large group with good, detailed information for the important explanatory
variables. The analyses shown in this section represent the key work, from which conclusions
were drawn concerning the impact of water billing system on water consumption. This survey
contained descriptive information about the property that included: plumbing fixtures,
water-using amenities, billing information, occupancy, and more. A copy of the manager survey
is reprinted in Appendix A. The analyses of the various factors from the manager survey are
presented later in this chapter.
Unadjusted Comparison of Water Use of Manager Survey Respondent Properties
The 2001 and 2002 annual water use per unit summary statistics for manager survey
respondents are shown in Table 5.8. On average, before adjusting for any differences in property
characteristics between properties employing different billing methods, the submetered units
used between 4 and 5 kgal less water per year than did units in the in-rent properties. The RUBS
properties used between 0.4 less and 3.3 kgal more water per year on average. The hot water
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