Clean Watersheds Needs Survey 2012
Distribution of total official needs by State
(January 2012 dollars in billions)
Total documented needs = $271.0 Billion
Range	I 1 I 1 I 1 1 1 I 1
>$25B $5-$25B $2.5-$5B $1-$2.5B <$1B Did not participate
Iowa
The Clean Watersheds Needs Survey (CWNS) is a
comprehensive assessment of needs 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).
Visit www.epa.gov/CWNS for more information.
.Wastewater
Category
Percent
Advanced Wastewater Treatment
Conveyance System Repair
IV New Conveyance Systems
V Combined Sewer Overflow Correction
VI Stormwater Management Program
X Recycled Water Distribution
Category IV
New Conveyance
Systems
$264M, 10.8%
Category III
Conveyance System Repair
$802M, 32.9%
CWNS 2012 Iowa documented needs
by category (January 2012 dollars in millions).
I Secondary Wastewater Treatment
Category X
Recycled Water Distribution
$2M, <1%
Category VI
Stormwater Management
Program
$55M, 2.3%
Category
Combined Sewer
Overflow Correction
S368M, 15.1%
Category I
Secondary
Treatment
S315M. 12.9%
Category II
Advanced
Wastewater
Treatment
$63QM, 25.8%
Improvements in treatment level of Iowa's publicly-owned wastewater treatment plants.

Population served in millions (number of facilities)
Population change
from 2008-2012
Projected
population change
from 2012-2032
Level of treatment
2004
2008
2012

2032
Less than Secondary"
-(0)
-(0)
-(0)
-(0)
-
-
Secondary
2.1 (716)
2.2 (703)
2.2 (707)
1.1 (523)
0.6%
-51.7%
Greater than Secondary
0.2(10)
0.4 (47)
0.4 (59)
1.9 (246)
2.1%
381.8%
No Discharge
<0.1(1)
<0.1(1)
<0.1 (2)
<0.1 (2)
75.1%
-6.6%
Partial Treatment
-(3)
-(6)
-(0)
-(0)
-
-
Total
2.3 (730)
2.6 (757)
2.6 (768)
3.0 (771)
0.8%
15.5%
1 Includes facilities granted section 301(h) waivers from secondary treatment for discharges to marine waters. As of January 1, 2012 waivers for 36 facilities in the CWNS 2012 database had been
granted or were pending.
Total Iowa needs
for the 2004-2012
CWNS by category
(January 2012
dollars in millions).
2004
CZl 2008
ZZl 2012
Needs Category

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