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National Pollutant Discharge Elimination System (NPDES)

Approved or Established TMDLs

A Total Maximum Daily Load (TMDL) is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards.

This page provides links to sources and program contacts related to approved or established TMDLs for waterbodies located in jurisdictions covered under the EPA Construction General Permit (CGP) and Multi-Sector General Permit (MSGP).

Depending upon the TMDL for your receiving waterbody, you might be required to install additional stormwater controls specifically designed to achieve reductions in the pollutant(s) causing the impairment of your receiving water. Consult the requirements pertaining to discharges to impaired waters with TMDLs in the permit that applies to your facility or site:

Additional information about TMDLs and stormwater is available on EPA’s Total Maximum Daily Loads (TMDLs) and Stormwater webpage.

State/Territory TMDL Information

Nonauthorized State / Territory

TMDL WLA

Supplemental Information

Alabama—Indian Country only

Region 4: Alabama TMDL Listing

Region 4 TMDL Contact

Alabama Department of Environmental Management TMDL program

Alabama 303(d) Listing/Map

Alaska—Indian Country; areas in Denali National Park and Preserve subject to construction by a federal operator

Region 10: Alaska TMDL Listing

Region 10 TMDL Contact

Alaska Department of Environmental Conservation TMDL program

Alaska Water Quality Assessment Report

American Samoa

Region 9: American Samoa TMDL Information

Note: Currently, there are no TMDLs developed.       

Region 9 TMDL Contact

Arizona—Indian Country only

Region 9: Arizona TMDL Listing

Region 9 TMDL Contact

Arizona Department of Environmental Quality TMDL Site

Arizona Water Quality Assessment Report

California—Indian Country only

Region 9: California TMDL Listing

Region 9 TMDL Contact

California Environmental Protection Agency TMDL program

California Water Quality Assessment Report

Colorado—Federal operators;  Indian Country only

Region 8 TMDL Contact

Colorado Department of Public Health and Environment TMDL Program

Colorado Water Quality Assessment Report

Connecticut—Indian Country only

Region 1: Connecticut TMDL Listing

Region 1 TMDL Contact

Connecticut Department of Environmental Protection TMDL program

Connecticut Water Quality Assessment Report

Delaware—Federal operators only

Region 3: Delaware TMDL Listing

Region 3 TMDL Contact

Delaware Department of Natural Resources and Environmental Control TMDL program

Delaware Water Quality Assessment Report

District of Columbia

Region 3: District of Columbia TMDL Listing

Region 3 TMDL Contact

District Department of the Environment TMDL Documents

District of Columbia Water Quality Assessment Report

Florida—Indian Country only

Region 4: Florida TMDL Listing

Region 4 TMDL Contact

Florida Department of Environmental Protection TMDL Program 

Florida Water Quality Assessment Report

Guam

Region 9: Guam TMDL Listing

Note: Currently, there are no TMDLs developed.

Region 9 TMDL Contact

Guam Water Quality Assessment Report

Idaho

Region 10: Idaho TMDL Listing

Region 10 TMDL Contact

Idaho Department of Environmental Quality TMDL program

Idaho Water Quality Assessment Report

Iowa—Indian Country only

Region 7: Iowa TMDL Listing

Iowa Department of Natural Resources TMDL program

Iowa Water Quality Assessment Report

Johnston Atoll

Kansas—Indian Country only

Region 7: Kansas TMDL Listing

Kansas Department of Health and Environment TMDL program

Kansas Water Quality Assessment Report

Louisiana—Indian Country only

Region 6: Louisiana TMDL Listing

Region 6 TMDL Contact

Louisiana Department of Environmental Quality TMDL Site

Louisiana Water Quality Assessment Report

Massachusetts

Region 1: Massachusetts TMDL Listing

Region 1 TMDL Contact

Massachusetts Department of Environmental Protection TMDL program

Massachusetts Water Quality Assessment Report

Michigan—Indian Country only

Region 5: Michigan TMDL Listing

Michigan Department of Environmental Quality TMDL program

Michigan Water Quality Assessment Report

Midway Islands

Note: Currently, there are no TMDLs developed.

Minnesota—Indian Country only

Region 5: Minnesota TMDL Listing and Contact

Minnesota Pollution Control Agency TMDL program

Minnesota Water Quality Assessment Report 

Mississippi—Indian Country only

Region 4: Mississippi TMDL Listing 

Region 4 TMDL Contact

Mississippi Department of Environmental Quality TMDL program

Mississippi Water Quality Assessment Report

Montana—Indian Country only

Region 8 TMDL Contact

Montana Department of Environmental Quality TMDL program

Montana Water Quality Assessment Report

Nebraska—Indian Country only

Region 7: Nebraska TMDL Listing

Nebraska Department of Environmental Quality TMDL program

Nebraska Water Quality Assessment Report

Nevada—Indian Country only

Region 9: Nevada TMDL Listing and Contact

Nevada Department of Environmental Protection TMDL Site

Nevada Water Quality Assessment Report

New Hampshire

Region 1: New Hampshire TMDL Listing

Region 1 TMDL Contact

New Hampshire Department of Environmental Services TMDL program

New Hampshire Water Quality Assessment Report

New Mexico

Region 6: New Mexico TMDL Listing

Region 6 TMDL Contact

New Mexico Environment Department TMDL Site

New Mexico Water Quality Assessment Report

New York—Indian Country only

Region 2: New York TMDL Listing

New York Department of Environmental Conservation TMDL program

New York Water Quality Assessment Report

North Carolina—Indian Country only

Region 4: North Carolina TMDL Listing

Region 4 TMDL Contact

North Carolina Division of Water Quality TMDL program

North Carolina Water Quality Assessment Report

North Dakota—Indian Country only

Region 8 TMDL Contact

North Dakota Department of Health TMDL program

North Dakota Water Quality Assessment Report

Northern Mariana Islands

Region 9: Northern Mariana Islands TMDL Listing

Note: Currently, there are no TMDLs developed.

Region 9 TMDL Contact

N. Mariana Islands Water Quality Assessment Report

Oklahoma—Indian Country; oil and gas operations

Region 6: Oklahoma TMDL Listing

Region 6 TMDL Contact

Oklahoma Department of Environmental Quality TMDL program

Oklahoma Water Quality Assessment Report

Oregon—Indian Country only

Region 10: Oregon TMDL Listing and Contact

Oregon Department of Environmental Quality TMDLs Program

Oregon Water Quality Assessment Report

Puerto Rico

Region 2: Puerto Rico TMDL Listing

Puerto Rico Water Quality Assessment Report

Rhode Island—Indian Country only

Region 1: Rhode Island TMDL Listing

Region 1 TMDL Contact

Rhode Island Department of Environmental Management TMDL program

Rhode Island Water Quality Assessment Report

South Dakota—Indian Country only

Region 8 TMDL Contact

South Dakota Department of Environmental and Natural Resources TMDL program

South Dakota Water Quality Assessment Report

Texas—Indian Country; oil and gas operations

Region 6: Texas TMDL Listing

Region 6 TMDL Contact

Texas State Soil and Water Conservation Board TMDL program

Texas Water Quality Assessment Report

Utah—Indian Country only

Region 8 TMDL Contact

Utah Division of Environmental Quality TMDL program

Utah Water Quality Assessment Report

Vermont—Federal operators

Region 1: Vermont TDML Listing

Region 1 TMDL Contact

Vermont Department of Environmental Conservation TMDL program 

Vermont Water Quality Assessment Report

Wake Island

Note: Currently, there are no TMDLs developed.

Washington—Federal operators; Indian Country only

Region 10: Washington TMDL Listing and Contact 

Washington Department of Ecology TMDL program

Washington Water Quality Assessment Report

Wisconsin—Indian Country only

Region 5: Wisconsin TMDL Listing and Contact

Wisconsin Department of Natural Resources TMDL program

Wisconsin 303(d) List/Fact Sheet

Wyoming—Indian Country only

Region 8 TMDL Contact

Wyoming Department of Environmental Quality TMDL program

Wyoming Water Quality Assessment Report

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