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On This Page
- Impaired Waters Listed by State
- Causes of Impairment for 303(d) Listed Waters
- Cumulative TMDLs by Pollutant
- Approved TMDLs by State
- Cumulative Number of TMDLs
- Status of Available Data Used in This Report
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National Summary of
Impaired Waters and TMDL Information
Depicted below are national summary tables and charts for available water quality data
reported by the States to EPA under Section 305(b) and 303(d) of the Clean Water Act.
This report displays the most current available reporting year data.
Check the Status of Available Data for more information.
Frequent Questions
Impaired Waters Listed By State
Description of this table
Total: 44,023 impaired waters
Causes of Impairment for 303(d) Listed Waters
Description of this tableTotal: 75,677 Causes of Impairment
National Cumulative TMDLs by Pollutant
This chart includes TMDLs since October 1, 1995.
Description of this tableTotal: 40,384 TMDLs; 42,642 Causes of Impairment Addressed
Approved TMDLs By State
This chart includes TMDLs since October 1, 1995.
Description of this table| NOTE: Click on the state name to see a state report. Click on the Number of TMDLs to see a detailed list of the TMDLs. | |
| State Name | Number of TMDLs |
|---|---|
| Alabama |  265 |
| Alaska | 44 |
| American Samoa | 2 |
| Arizona | 69 |
| Arkansas | 232 |
| California | 979 |
| Colorado | 955 |
| Connecticut | 109 |
| Delaware | 558 |
| District Of Columbia | 360 |
| Florida | 657 |
| Georgia | 1,554 |
| Guam | 1 |
| Hawaii | 49 |
| Idaho | 1,611 |
| Illinois | 302 |
| Indiana | 768 |
| Iowa | 136 |
| Kansas | 2,727 |
| Kentucky | 124 |
| Louisiana | 665 |
| Maine | 292 |
| Maryland | 608 |
| Massachusetts | 426 |
| Michigan | 160 |
| Minnesota | 1,166 |
| Mississippi | 1,310 |
| Missouri | 137 |
| Montana | 607 |
| Nebraska | 91 |
| Nevada | 58 |
| New Hampshire | 5,510 |
| New Jersey | 598 |
| New Mexico | 224 |
| New York | 638 |
| North Carolina | 145 |
| North Dakota | 69 |
| Ohio | 1,147 |
| Oklahoma | 223 |
| Oregon | 1,035 |
| Pennsylvania | 6,207 |
| Puerto Rico | 53 |
| Rhode Island | 104 |
| South Carolina | 425 |
| South Dakota | 269 |
| Tennessee | 1,039 |
| Texas | 154 |
| Utah | 301 |
| Vermont | 94 |
| Virgin Islands | 29 |
| Virginia | 979 |
| Washington | 1,120 |
| West Virginia | 2,561 |
| Wisconsin | 96 |
| Wyoming | 342 |
Total: 40,384 TMDLs
National 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 |
|---|---|---|
| 1996 | 122 |
123 |
| 1997 | 338 |
352 |
| 1998 | 403 |
409 |
| 1999 | 335 |
381 |
| 2000 | 1,560 |
1,584 |
| 2001 | 2,571 |
2,607 |
| 2002 | 2,745 |
2,820 |
| 2003 | 2,969 |
3,246 |
| 2004 | 3,378 |
3,643 |
| 2005 | 4,245 |
4,563 |
| 2006 | 4,202 |
4,554 |
| 2007 | 4,321 |
4,652 |
| 2008 | 9,199 |
9,480 |
| 2009 | 3,966 |
4,184 |
| 2010 | 30 |
44 |
Total: 40,384 TMDLs; 42,642 Causes of Impairment Addressed
Status of Available Data Used in This Report
Description of this table| State Name | Assessed Waters Report Year | Impaired Waters Report Year |
|---|---|---|
| Alabama | 2008 | 2008 |
| Alaska | 2008 | 2008 |
| American Samoa | 2008 | 2008 |
| Arizona | 2008 | 2004 |
| Arkansas | 2008 | 2008 |
| California | 2004 | 2006 |
| Colorado | 2008 | 2008 |
| Connecticut | 2008 | 2008 |
| Delaware | 2006 | 2006 |
| District Of Columbia | 2008 | 2008 |
| Florida | 2002 | 2002 |
| Georgia | 2008 | 2008 |
| Guam | 2008 | 2008 |
| Hawaii | 2006 | 2006 |
| Idaho | 2008 | 2008 |
| Illinois | 2006 | 2006 |
| Indiana | 2008 | 2008 |
| Iowa | 2008 | 2006 |
| Kansas | 2008 | 2008 |
| Kentucky | 2008 | 2008 |
| Louisiana | 2008 | 2006 |
| Maine | 2008 | 2008 |
| Maryland | 2002 | 2006 |
| Massachusetts | 2006 | 2006 |
| Michigan | 2008 | 2008 |
| Minnesota | 2008 | 2008 |
| Mississippi | 2008 | 2008 |
| Missouri | 2008 | 2006 |
| Montana | 2006 | 2006 |
| N. Mariana Islands | 2008 | 2008 |
| Nebraska | 2008 | 2008 |
| Nevada | 2006 | 2004 |
| New Hampshire | 2006 | 2006 |
| New Jersey | 2008 | 2008 |
| New Mexico | 2008 | 2008 |
| New York | 2008 | 2008 |
| North Carolina | 2006 | 2006 |
| North Dakota | 2008 | 2008 |
| Ohio | 2008 | 2008 |
| Oklahoma | 2008 | 2008 |
| Oregon | 2006 | 2006 |
| Pennsylvania | 2006 | 2004 |
| Puerto Rico | 2008 | 2008 |
| Rhode Island | 2008 | 2008 |
| South Carolina | 2008 | 2008 |
| South Dakota | 2008 | 2008 |
| Tennessee | 2008 | 2008 |
| Texas | 2008 | 2008 |
| Utah | 2006 | 2006 |
| Vermont | 2008 | 2008 |
| Virgin Islands | 2008 | 2008 |
| Virginia | 2008 | 2008 |
| Washington | 2008 | 2008 |
| West Virginia | 2008 | 2008 |
| Wisconsin | 2006 | 2006 |
| Wyoming | 2008 | 2008 |