Hist and Proj Operating Receipts FY 2011 2 17 2010 - DC Water

Imperuious Surface Area Charge Residential Six-tier Rate Structure
ln line with DC WASA's Board Resolution #08-37 and Policy #3 on lmpervious Surface Area Charge, a review of the data and rate
options to consider a multitier rate structure was completed. The review took into consideration impacts from a technical, data
completeness, revenue sufficiency, and legal perspective. The Board asked management to develop a residential multi - tier rate
structure to replace the original methodology of 1 ERU for all residential properties based on property size and equity. Currently, the
number of ERUs billed to residential customers totals 104,483. After analysis and review of several billing options, a six-tier billing
structure for residential customers has been recommended and incorporated within the currently proposed financial plan update
beginning with FY 2011. This tier structure would increase the total number of billed residential ERUs to approximately 1 13,471.
The following table demonstrates the distribution of the residential ERUs by tiers and size. lf approved, approximately 74 percent of
the residential customers will see no change in the ERU quantity on their monthly bill; and approximately 18 percent will pay slightly
less.
Tiers Size of lmpervious Area (Square Feet) ERU # of Properties
Tier 1 100 - 600 0.6 18,563
Tier2 700 - 2,000 1.0 77,514
Tier 3 2,100 - 3,000 2.4 5,736
Tier 4 3,100 - 7,000 3.8 2,499
Tier 5 7,100 - 11,000 8.6 124
Tier 6 11,100-and more 13.5 47
lmperuious Surface Area Charge Credit Program
ln line with DC WASA's Board Resolution #08-37 and Policy #3 on lmpervious Surface Area Charge, Authority Equitable Ratemaking
Amendment Act of 2008 and the District of Columbia Comprehensive Stormwater Management Enhancement Amendment Act of
2008, DC WASA is working in coordination with the District Department of Environment (DDOE) to review data and create a credit
program that will provide incentives to DC property owners to implement Best Management Practices (BMP) as may be defined
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