Metadata Summary: EPA Impaired Waters & TMDL Data

Dataset Type: GIS/Spatial Data

Name of Data Source: EPA Impaired Waters & TMDL Data

Datasource Abbreviation (dataset): EPA_IMPAIRED

Description of Datasource: Under section 303(d) of the Clean Water Act, states, territories, and authorized tribes are required to develop lists of impaired waters. These are waters that are too polluted or otherwise degraded to meet the water quality standards set by states, territories, or authorized tribes. The law requires that these jurisdictions establish priority rankings for waters on the lists and develop TMDLs for these waters. A Total Maximum Daily Load, or TMDL, is a calculation of the maximum amount of a pollutant that a waterbody can receive and still safely meet water quality standards.

How Often Data is Transferred to the Atlas: Annually

Period of Record Within the Atlas: 2002 - 2011

Date Added/Updated on Atlas: 10/26/2012

Disclaimer/Use Constraints: Not Available

Custodian Information:
US Environmental Protection Agency
Office of Wetlands, Oceans, and Watersheds

Contact Name: Tom Wall, Director

Contact Email: wall.tom@epa.gov

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