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 and 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 and Contact	Alaska Department of Environmental Conservation TMDL program Alaska Water Quality Assessment Report
American Samoa	Region 9: American Samoa TMDL Information and Contact Currently, there are no TMDLs developed.
Arizona—Indian Country only	Region 9: Arizona TMDL Listing and Contact	Arizona Department of Environmental Quality TMDL Site Arizona Water Quality Assessment Report
California—Indian Country only	Region 9: California TMDL Listing and Contact	California Environmental Protection Agency TMDL program California Water Quality Assessment Report
Colorado—Federal operators; Indian Country only	Region 8 TMDL Listing and Contact	Colorado Department of Public Health and Environment Water Quality Program Colorado Water Quality Assessment Report
Connecticut—Indian Country only	Region 1: Connecticut TMDL Listing and Contact	Connecticut Department of Environmental Protection TMDL program Connecticut Water Quality Assessment Report
Delaware—Federal operators only	Region 3: Delaware TMDL Listing and 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 and Contact	District Department of the Environment TMDL Documents District of Columbia Water Quality Assessment Report
Florida—Indian Country only	Region 4: Florida TMDL Listing and Contact	Florida Department of Environmental Protection TMDL Program Florida Water Quality Assessment Report
Guam	Region 9: Guam TMDL Listing and Contact Currently, there are no TMDLs developed.	Guam Water Quality Assessment Report
Idaho	Region 10: Idaho TMDL Listing and Contact	Idaho Department of Environmental Quality TMDL program Idaho Water Quality Assessment Report
Iowa—Indian Country only	Region 7: Iowa TMDL Listing and Contact	Iowa Department of Natural Resources TMDL program Iowa Water Quality Assessment Report
Johnston Atoll
Kansas—Indian Country only	Region 7: Kansas TMDL Listing and Contact	Kansas Department of Health and Environment TMDL program Kansas Water Quality Assessment Report
Louisiana—Indian Country only	Region 6: Louisiana TMDL Listing and Contact	Louisiana Department of Environmental Quality TMDL Site Louisiana Water Quality Assessment Report
Massachusetts	Region 1: Massachusetts TMDL Listing and Contact	Massachusetts Department of Environmental Protection TMDL program Massachusetts Water Quality Assessment Report
Michigan—Indian Country only	Region 5: Michigan TMDL Listing and Contact	Michigan Department of Environmental Quality TMDL program Michigan Water Quality Assessment Report
Midway Islands	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 and Contact	Mississippi Department of Environmental Quality TMDL program Mississippi Water Quality Assessment Report
Montana—Indian Country only	Region 8 TMDL Listing and Contact	Montana Department of Environmental Quality TMDL program Montana Water Quality Assessment Report
Nebraska—Indian Country only	Region 7: Nebraska TMDL Listing and Contact	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 and Contact	New Hampshire Department of Environmental Services TMDL program New Hampshire Water Quality Assessment Report
New Mexico	Region 6: New Mexico TMDL Listing and Contact	New Mexico Environment Department TMDL Site New Mexico Water Quality Assessment Report
New York—Indian Country only	Region 2: New York TMDL Listing and Contact	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 and Contact	North Carolina Division of Water Quality TMDL program North Carolina Water Quality Assessment Report
North Dakota—Indian Country only	Region 8 TMDL Listing and Contact	North Dakota Department of Health TMDL program North Dakota Water Quality Assessment Report
Northern Mariana Islands	Region 9: Northern Mariana Islands TMDL Listing and Contact Currently, there are no TMDLs developed.	N. Mariana Islands Water Quality Assessment
Oklahoma—Indian Country; oil and gas operations	Region 6: Oklahoma TMDL Listing and 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 and Contact	Puerto Rico Water Quality Assessment Report
Rhode Island—Indian Country only	Region 1: Rhode Island TMDL Listing and Contact	Rhode Island Department of Environmental Management TMDL program Rhode Island Water Quality Assessment Report
South Dakota—Indian Country only	Region 8 TMDL Listing and 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 and Contact	Texas State Soil and Water Conservation Board TMDL program Texas Water Quality Assessment Report
Utah—Indian Country only	Region 8 TMDL Listing and Contact	Utah Division of Environmental Quality TMDL program Utah Water Quality Assessment Report
Vermont—Federal operators	Region 1: Vermont TDML Listing and Contact	Vermont Department of Environmental Conservation TMDL program Vermont Water Quality Assessment Report
Wake Island	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 Listing and Contact	Wyoming Department of Environmental Quality TMDL program Wyoming Water Quality Assessment Report

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