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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:
2004
2006
Waterbody Changes from Prior Cycle
For More Information:
Delaware Assessment Report
State Water Quality Program
Delaware Impaired Waters and TMDL Information
Assessed Waters of Delaware by Watershed
Search for a waterbody within Delaware
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Delaware Previously 303(d)-Listed Waters Now Attaining All Applicable Water Quality Standards
No previously 303(d)-listed waters reported as now attaining all applicable water quality standards.
Delaware 2002 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 |
|---|---|
| Habitat Alterations |  176 |
| Pathogens | 157 |
| Cause Unknown - Impaired Biota | 114 |
| Nutrients | 108 |
| Organic Enrichment/Oxygen Depletion | 92 |
| Polychlorinated Biphenyls (PCBs) | 25 |
| Dioxins | 12 |
| Pesticides | 10 |
| Temperature | 8 |
| Mercury | 6 |
| Metals (other than Mercury) | 3 |
| Turbidity | 1 |
| Total Toxics | 1 |
Total: 713 Causes of Impairment
Delaware 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 |
|---|---|---|
| Phosphorus |  165 |
173 |
| Bacteria | 149 |
149 |
| Nitrogen | 114 |
114 |
| Dissolved Oxygen | 87 |
87 |
| Ammonia | 17 |
17 |
| Biochemical Oxygen Demand (BOD) | 15 |
15 |
| Carbonaceous Bod | 6 |
6 |
| Nutrients | 3 |
3 |
| Polychlorinated Biphenyls (PCBs) | 3 |
3 |
| Zinc | 3 |
3 |
| Habitat | 2 |
2 |
| Nitrogen, Total | 2 |
2 |
| Phosphorus, Total | 2 |
2 |
| Temperature | 2 |
2 |
| Total Suspended Solids (TSS) | 2 |
2 |
| Escherichia Coli (E. Coli) | 1 |
1 |
| Fecal Coliform | 1 |
1 |
| NH3-N | 1 |
1 |
| Phosphates | 1 |
1 |
Total: 576 TMDLs; 584 Causes of Impairment Addressed
Delaware 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 |
|---|---|---|
| 1998 | 3 |
3 |
| 1999 | 10 |
10 |
| 2000 | 2 |
2 |
| 2001 | 72 |
72 |
| 2003 | 29 |
37 |
| 2004 | 15 |
15 |
| 2005 | 64 |
64 |
| 2006 | 103 |
103 |
| 2007 | 271 |
271 |
| 2010 | 1 |
1 |
| 2011 | 6 |
6 |
Total: 576 TMDLs; 584 Causes of Impairment Addressed