Jump to main content or area navigation.

Contact Us

Water: Anti-Degradation

Antidegradation Clearinghouse

This clearinghouse is a compilation of information on antidegradation, including state, tribe, and territorial antidegradation policies, EPA guidance, regulations, and recent actions, including proposed and final federal water quality standards. The compiled antidegradation policies are from state, territorial, and authorized tribal water quality standards. These standards (and consequently, the antidegradation policies) are either EPA-approved or were effective before May 30, 2000 for Clean Water Act purposes. Additional information.

This site will be updated periodically to reflect EPA approved revisions and additions to state, tribal, and territorial antidegradation policies.

State, Tribal & Territorial Antidegradation Policies

Click on the map or drop down menus below to find state and territorial antidegradation policies. To view the designated uses of water bodies in table or map form for selected states, see the water quality standards database. For the most recent version of specific antidegradation policies and procedures please contact the appropriate regional water quality standards coordinator.

Tribal antidegradation policies

You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.

Map of the United States, split into states

AlabamaAlaskaAmerican SamoaArizonaArkansasCaliforniaColoradoConnecticutDelawareWashington, DC Florida GeorgiaGuamHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachussetsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaNorthern Mariana IslandsOhioOklahomaOregonPennsylvaniaPuerto RicoRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirgin IslandsVirginiaWashingtonWest VirginiaWisconsinWyomingTo submit corrections or errors, please contact us.

Top of page

Implementation Procedures

The implementation procedures from the states listed below possess certain commendable features. However, it is important to note there are strengths and weaknesses to any implementation procedure, and that EPA does not necessarily recommend all aspects of the procedures below. Your regional water quality standards coordinator can provide assistance and technical support to help determine what antidegradation policy implementation procedures are appropriate for your state, tribe or territory.

Top of Page

Interstate Agencies

The links below give information about interstate agencies that help regulate water quality standards and antidegradation policy. Exit EPA Disclaimer

Top of Page

Proposed & Final Rules


Top of Page

Jump to main content.