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The 303(d) Listed Impaired Waters program provides impaired water data and impaired water features reflecting river segments, lakes, and estuaries designated under Section 303(d) of the Clean Water Act (CWA). Each State will establish Total Maximum Daily Loads (TMDLs) for these waters. Note the CWA Section 303(d) list of impaired waters does not represent waters that are impaired but have an established TMDL, impaired waters for which other pollution control mechanisms are in place and expected to attain water quality standards, or waters impaired as a result of pollution. Therefore, the "Impaired Waters" layers do not represent all impaired waters reported in a state's Integrated Report, but only the waters comprised...
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“Under section 303(d) of the 1972 Clean Water Act, states, territories, and authorized tribes are required to develop lists of impaired waters. These impaired waters do not meet water quality standards that states, territories, and authorized tribes have set for them, even after point sources of pollution have installed the minimum required levels of pollution control technology. The law requires that these jurisdictions establish priority rankings for waters on the lists and develop TMDLs for these waters” (U.S. Environmental Protection Agency, 2011). Waterways represented in this data set are a subset of these EPA 303 (d) listed streams that were classified as nutrient impaired. Nutrient impaired streams include...
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The 303(d) Listed Impaired Waters program system provides impaired water data and impaired water features reflecting river segments, lakes, and estuaries designated under Section 303(d) of the Clean Water Act. Each State will establish Total Maximum Daily Loads (TMDLs) for these waters. Note the CWA Section 303(d) list of impaired waters does not represent waters that are impaired but have an EPA-approved TMDL established, impaired waters for which other pollution control mechanisms are in place and expected to attain water quality standards, or waters impaired as a result of pollution and is not caused by a pollutant; therefore, the "Impaired Waters" layers do not represent all impaired waters reported in a state's...
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This map service contains GIS data from the EPA Office of Water 303(d) Program in Web Mercator. It is available as a WMS, KML and REST service as well as the native MapServer service.


    map background search result map search result map Department of Environmental Quality (DEQ) 305b Streams for Wyoming 303(d) Listed Impaired Waters Nutrient Impaired 303(d) Streams for the Pacific Northwest Impared Waters - 303(d) list EPA Office of Water (OW): 303(d) Listed Impaired Waters, Sonoran Desert ecoregion (waterbodies) EPA Office of Water (OW): 303(d) Listed Impaired Waters, Sonoran Desert ecoregion (waterbodies) Department of Environmental Quality (DEQ) 305b Streams for Wyoming Nutrient Impaired 303(d) Streams for the Pacific Northwest 303(d) Listed Impaired Waters Impared Waters - 303(d) list