Delaware
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). Delaware documented
needs totaling $222 million in 2008.
This is a 40 percent increase from the
$159 million in needs documented in
2004.
Documented Needs in Delaware
Needs (2008 Dollars, Millions)
Type of Need
2004
2008
Percent Change
Wastewater treatment
$73
$75
3%
Pipe repair and new pipes
$61
$122
100%
Recycled water distribution
nra
nr
0%
Combined sewer overflow correction
$25
$25
0%
Total Wastewater Treatment Needs
$159
$222
40%
Conveyance infrastructure
n/a
nr
n/a
Treatment systems
n/a
nr
n/a
Green infrastructure
n/a
nr
n/a
General stormwater management
nr
nr
0%
Total Stormwater Management Needsb
nr
nr
0%>
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
nr
nr
0%
Sanitary landfills BMPs
nr
nr
0%
Hydromodification (Water resource restoration and protection)
nr
nr
0%
Other estuary management activities0
n/a
nr
n/a
Total Nonpoint Source Control Needsb'd
nr
nr
0%>
Total Decentralized Wastewater Treatment Needsb'd
nr
nr
0%>
Total Needs
$159
$222
40%.
aNot reported; bActual needs may be higher, since documenting these needs is difficult; cIn 2004, Other Estuary Management
Needs were reported under Separate State Estimates (SSEs); dNot included in Official Needs in the Report to Congress.
County Needs ($M)
None reported
<25
25-50
H >50
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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Delaware
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, 91% of Delaware residents received centralized wastewater treatment services at the secondary,
advanced, or no discharge treatment level, compared to 32% in 1972.
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
6
0
0
15,000
3
0
0
0
Secondary
9
5
3
8,000
1
19,220
2
16,196
Advanced
9
9
10
88,000
15
684,934
79
809,790
No Discharge
0
4
4
0
0
25,444
3
41,212
Total
24
18
17
111,000
19
729,598
84
867,198
a Number of facilities and population served if all needs documented in the CWNS 2008 are met.
Small Communities
In Delaware, small community
wastewater facilities serve 8% of the
population and comprise 40% 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

1 Needs (2008 Dollars, Millions)
Population 2004
2008
2004
2008
0-999 2
2
$7
$10
1,000-3,499 3
4
$19
$48
3,500-10,000 5
6
$34
$30
Total 10
12
$60
$88
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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