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- Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Cumulative Number of TMDLs
Data are also available for these cycles:
2002
2004
2006
2008
Waterbody Changes from Prior Cycle
For More Information:
Iowa Assessment Report
State Water Quality Program
Iowa Assessment Report
State Water Quality Program
Iowa Impaired Waters and TMDL Information
Assessed Waters of Iowa by Watershed
Search for a waterbody within Iowa
Features
- About This Database (Integrated Report)
- Assessing Water Quality (Questions and Answers)
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- How's My Waterway Local Search tool
- Pollution Categories Summary Document
Iowa Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
Description of this table| NOTE: Click on the underlined "Number of Waters Attaining" value for a detailed list of those previously 303(d)-listed waters now attaining all applicable water quality standards. | ||
| Year Attaining | Number of Waters Attaining | Number of Causes of Impairment Addressed |
|---|---|---|
| 2008 |  19 |
24 |
| 2010 | 17 |
17 |
| 2011 | 2 |
2 |
Iowa 2010 Causes of Impairment for 303(d) Listed Waters
Description of this table| NOTE: Click on a cause of impairment (e.g. pathogens) to see the specific state-reported causes that are grouped to make up this category. Click on the "Number of Causes of Impairment Reported" to see a list of waters with that cause of impairment. | |
| Cause of Impairment Group Name | Number of Causes of Impairment Reported |
|---|---|
| Pathogens |  229 |
| Cause Unknown - Impaired Biota | 139 |
| Cause Unknown - Fish Kills | 73 |
| Algal Growth | 47 |
| Turbidity | 25 |
| pH/Acidity/Caustic Conditions | 21 |
| Mercury | 20 |
| Organic Enrichment/Oxygen Depletion | 17 |
| Metals (other than Mercury) | 14 |
| Polychlorinated Biphenyls (PCBs) | 3 |
| Pesticides | 2 |
| Ammonia | 2 |
| Nutrients | 1 |
| Toxic Organics | 1 |
Total: 594 Causes of Impairment
Iowa Cumulative TMDLs by Pollutant
This chart includes TMDLs since October 1, 1995.
Description of this table| NOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs" value to see a listing of those TMDLs for the pollutant. | ||
| Pollutant | Number of TMDLs | Number of Causes of Impairment Addressed |
|---|---|---|
| Escherichia Coli (E. Coli) |  44 |
60 |
| Turbidity | 26 |
30 |
| Siltation | 23 |
23 |
| Algae | 18 |
21 |
| Nutrients | 14 |
14 |
| Phosphorus, Total | 7 |
13 |
| Nitrate | 6 |
6 |
| Organic Enrichment | 6 |
6 |
| Ammonia | 4 |
5 |
| Pathogens | 4 |
5 |
| Sediment | 4 |
4 |
| Atrazine | 3 |
3 |
| Dissolved Oxygen | 3 |
5 |
| Noxious Aquatic Plants | 3 |
3 |
| Phosphorus | 3 |
3 |
| pH | 3 |
4 |
| Algal Growth | 2 |
3 |
| Excess Algal Growth | 2 |
3 |
| Suspended Solids | 2 |
2 |
| Chlordane | 1 |
1 |
| Chlordane in Fish Tissue | 1 |
1 |
| Chlorophyll-A | 1 |
1 |
| Clarity | 1 |
2 |
| Nitrous Oxide (NOX) | 1 |
1 |
| Other Nutrients | 1 |
2 |
| Oxygen Demand | 1 |
1 |
| Priority Organics Compounds | 1 |
1 |
| Thermal Modifications | 1 |
1 |
| Total Suspended Solids (TSS) | 1 |
2 |
| pH, High | 1 |
1 |
Total: 188 TMDLs; 227 Causes of Impairment Addressed
Iowa Cumulative Number of TMDLs
EPA Fiscal Year starts October 1 and ends September 30.
Description of this table
| NOTE: Click on the underlined "Number of TMDLs Completed" value for a detailed list of the TMDLs for the fiscal year. | ||
| Fiscal Year | Number of TMDLs | Number of Causes of Impairment Addressed |
|---|---|---|
| 2001 | 10 |
10 |
| 2002 | 9 |
9 |
| 2003 | 16 |
16 |
| 2005 | 36 |
36 |
| 2006 | 17 |
18 |
| 2007 | 13 |
14 |
| 2008 | 21 |
26 |
| 2009 | 13 |
16 |
| 2010 | 27 |
38 |
| 2011 | 8 |
17 |
| 2012 | 18 |
27 |
Total: 188 TMDLs; 227 Causes of Impairment Addressed