District of Columbia
Clean Watersheds Needs Survey 2008
The Clean Watersheds Needs
Survey (CWNS) is a comprehensive
assessment of needs1 to meet the water
quality and water-related public health
goals of the Clean Water Act (CWA).
States and the U.S. Environmental
Protection Agency (EPA) conduct the
CWNS every four years under CWA
Section 516 (b). District of Columbia
documented needs totaling $2.5 billion
in 2008. This is a 5 percent increase
from the $2.4 billion in needs
documented in 2004.
Documented Needs in District of Columbia
Needs (2008 Dollars, Millions)
Type of Need
2004
2008
Percent Change
Wastewater treatment
$638
$656
3%
Pipe repair and new pipes
$209
nra
-100%
Recycled water distribution
nr
nr
0%
Combined sewer overflow correction
$1,549
$1,889
22%
Total Wastewater Treatment Needs
$2,396
$2,545
6%
Conveyance infrastructure
n/a
nr
n/a
Treatment systems
n/a
nr
n/a
Green infrastructure
n/a
nr
n/a
General stormwater management
$16
nr
-100%
Total Stormwater Management Needsb
$16
nr
-100%
Agriculture (cropland) best management practices (BMPs)
nr
nr
0%
Agriculture (animals) BMPs
nr
nr
0%
Silviculture (forestry) BMPs
nr
nr
0%
Ground water protection: unknown source BMPs
nr
nr
0%
Marinas BMPs
nr
nr
0%
Resource extraction BMPs
nr
nr
0%
Brownfields remediation
nr
nr
0%
Storage tank remediation
$5
<$0.5
-98%
Sanitary landfills BMPs
nr
nr
0%
Hydromodification (Water resource restoration and protection)
$2
nr
-100%
Other estuary management activities0
n/a
nr
n/a
Total Nonpoint Source Control Needsb'd
$7
<$0.5
-98%
Total Decentralized Wastewater Treatment Needsb'd
nr
nr
0%
Total Needs
$2,419
$2,545
5%
aNot reported; bActual needs may be higher, since documenting these needs is difficult; cIn 2004, Other Estuary Management
Needs were reported under Separate State Estimates (SSEs); dNot included in Official Needs in the Report to Congress.
Courtly Needs (SB)
None reported
< 2
I I 2-3
1 Documented needs in the CWNS include the unfunded capital costs of projects as of January 1, 2008 that address a water
quality or a water quality-related public health problem existing as of January 1, 2008, or expected to occur within the next 20
years; and meet the seven CWNS documentation criteria. All needs are in January 2008 dollars.

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District of Columbia
Clean Watersheds Needs Survey 2008
Wastewater Treatment Facilities
The enactment of the Clean Water Act (CWA) in 1972 resulted in dramatic improvements in the:
•	Number of wastewater treatment plants.
•	Percentage of the population served by wastewater treatment plants.
•	Quality of effluent treatment from wastewater treatment facilities.
In 2008, 100% of District of Columbia residents received centralized wastewater treatment services at the
secondary, advanced, or no discharge treatment level.
Number of Centralized Treatment Facilities and Population Served
Number of Facilities
Population Served
%Total	%Total
Population	Population
Treatment Level
1972
2008
Projected"
1972
1972
2008
2008
Projected3
Less than Secondary
0
0
0
0
0
0
0
0
Secondary
0
0
0
0
0
0
0
0
Advanced
1
1
1
716,000
100
538,000
100
441,000
No Discharge
0
0
0
0
0
0
0
0
Total
1
1
1
758,000
106
538,000
100
441,000
a Number of facilities and population served if all needs documented in the CWNS 2008 are met.
Small Communities
In District of Columbia, small
community wastewater facilities serve
0% of the population and comprise 0%
of total wastewater treatment and
collection needs. EPA small community
support information is available at:
www. epa. gov/owm/mab/smcomm
Reported Needs for Facilities in Small Communities
Facilities

I Needs (2008 Dollars, Millions)
Population
2004
2008
2004
2008
0-999
0
0
$0
$0
1,000-3,499
0
0
$0
$0
3,500-10,000
0
0
$0
$0
Total
0
0
$0
$0
Visit www.epa.gov/cwns for more information including:
•	Detailed Reports to Congress
•	Other state fact sheets
•	Maps, charts, and data downloads for projects, facilities, watersheds, counties, congressional
districts, cities, states, and regions

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