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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
2010
Waterbody Changes from Prior Cycle
For More Information:
Connecticut Assessment Report
State Water Quality Program
Connecticut Impaired Waters and TMDL Information
Assessed Waters of Connecticut by Watershed
Search for a waterbody within Connecticut
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- Pollution Categories Summary Document
Connecticut 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 |
|---|---|---|
| 2004 |  6 |
9 |
| 2006 | 3 |
5 |
| 2011 | 9 |
9 |
Connecticut 2008 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 |  340 |
| Cause Unknown | 113 |
| Organic Enrichment/Oxygen Depletion | 67 |
| Nutrients | 44 |
| Polychlorinated Biphenyls (PCBs) | 31 |
| Metals (other than Mercury) | 20 |
| Algal Growth | 19 |
| Mercury | 11 |
| Oil and Grease | 9 |
| Cause Unknown - Impaired Biota | 8 |
| Sediment | 5 |
| Turbidity | 4 |
| Pesticides | 2 |
| Ammonia | 2 |
| Dioxins | 2 |
| Toxic Organics | 2 |
| Other Cause | 1 |
| Salinity/Total Dissolved Solids/Chlorides/Sulfates | 1 |
| Chlorine | 1 |
| Total Toxics | 1 |
| Taste, Color and Odor | 1 |
Total: 684 Causes of Impairment
Connecticut 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) |  230 |
235 |
| Fecal Coliform | 47 |
47 |
| Copper | 6 |
6 |
| Zinc | 5 |
5 |
| Chlorine | 4 |
4 |
| Enterococcus Bacteria | 4 |
4 |
| Algal Growth | 3 |
3 |
| Ammonia | 3 |
3 |
| Lead | 3 |
3 |
| 1,2-Propanediol | 2 |
2 |
| Ethylene Glycol | 2 |
2 |
| Nitrogen, Total | 2 |
2 |
| Nutrients | 2 |
2 |
| Organic Enrichment/Low Dissolved Oxygen | 2 |
2 |
| Phosphorus, Total | 2 |
2 |
| Pollutants in Urban Stormwater | 2 |
2 |
| Turbidity | 2 |
2 |
| Algal Growth/Chlorophyll A | 1 |
1 |
| Chlorophyll-A | 1 |
1 |
| Nitrogen | 1 |
1 |
| Toxicity | 1 |
1 |
Total: 325 TMDLs; 330 Causes of Impairment Addressed
Connecticut 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 |
|---|---|---|
| 2000 | 11 |
11 |
| 2001 | 9 |
9 |
| 2002 | 7 |
7 |
| 2004 | 3 |
3 |
| 2005 | 30 |
30 |
| 2006 | 16 |
16 |
| 2007 | 7 |
7 |
| 2008 | 26 |
27 |
| 2010 | 9 |
9 |
| 2011 | 25 |
25 |
| 2012 | 182 |
186 |
Total: 325 TMDLs; 330 Causes of Impairment Addressed