Antidegradation Online Report Database

Welcome to River Network's state-by-state look at antidegradation policies around the country. This database will allow you to see how your state's policy for keeping clean water clean works, and compare your state with other states. Currently, the database has data from ten states. We will add the remaining states in subsequent phases.

The database results use regulatory language that may be confusing to someone new to antidegradation - please visit the Clean Water Act online course if you need more background on the basics. Use our database explainer to learn more about the data terms and categories used in the database.

Please select a report to view and click submit.

Select states/regions (use CTRL key to select more than one): * AlabamaArizonaArkansasColoradoDelawareIdahoIllinoisKansasMaineMarylandMassachusettsMichiganMississippiMissouriMontanaNebraskaNevadaNew HampshireNew MexicoOhioRhode IslandSouth CarolinaSouth DakotaUtahVermontWashingtonWyoming

Please select the type of report you want to generate: Full ReportContact, Citations and Links OnlyAntidegradation PolicyImplementation PolicyApplication to mixing zonesPublic involvement requirementsTriggersExemptionsApplication of de minimusCumulative cap on de minimusApplication of grandfatheringSocioeconomic test existsSocioeconomic test detailsAlternatives test existsAlternatives test detailsTier 2.5Outstanding National Resource Waters

Confused? Use our database explainer to understand more about the data terms and categories used in the database.

Do you have an update to data presented in this database? Please let us know!

The data presented in this database is summarized by River Network staff, with input from state agency staff and/or our local Partners where appropriate. The data do not represent the legal interpretation of regulations by the state agencies or our Partners.