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  • EPA Office of Water (OW): 303(d) Listed Impaired Waters NHDPlus Indexed Dataset

    Metadata Updated: August 30, 2023

    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 Integrated Report, but only the waters comprised of a state's approved 303(d) list. For more information regarding impaired waters refer to EPA's Integrated Reporting Guidance at: https://water.epa.gov/lawsregs/lawsguidance/cwa/tmdl/guidance.cfm. 303(d) waterbodies are coded onto NHDPlus v2.1 flowline and waterbody features to create line, area, and point events. In addition to NHDPlus reach indexed data there may also be custom event data (point, line, or polygon) that are not associated with NHDPlus and are in an EPA standard format that is compatible with EPA's Reach Address Database. These custom features are used to represent locations of 303(d) waterbodies that are not represented well in NHDPlus.

    Access & Use Information

    License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Date May 16, 2016
    Metadata Created Date August 30, 2023
    Metadata Updated Date August 30, 2023
    Reference Date(s) May 1, 2015 (publication)
    Frequency Of Update continual

    Metadata Source

    Harvested from Environmental Dataset Gateway ISO Geospatial Metadata

    Additional Metadata

    Resource Type Dataset
    Metadata Date May 16, 2016
    Metadata Created Date August 30, 2023
    Metadata Updated Date August 30, 2023
    Reference Date(s) May 1, 2015 (publication)
    Responsible Party U.S. Environmental Protection Agency, Headquarters (Point of Contact)
    Contact Email
    Guid {66F27299-6B1B-42BF-8AA0-1127D7646631}
    Access Constraints Use Constraints: None., Access Constraints: None.
    Bbox East Long -64
    Bbox North Lat 50
    Bbox South Lat 17
    Bbox West Long -160
    Coupled Resource
    Frequency Of Update continual
    Harvest Object Id 51efd571-8d91-491f-bcef-52e3c8e74184
    Harvest Source Id 9b3cd81e-5515-4bb7-ad3c-5ae44de9b4bd
    Harvest Source Title Environmental Dataset Gateway ISO Geospatial Metadata
    Licence https://edg.epa.gov/EPA_Data_License.html
    Licence Url https://edg.epa.gov/EPA_Data_License.html
    Lineage This lineage was generated by the FGDC CSDGM to 19139 transformation
    Metadata Language eng; USA
    Metadata Type geospatial
    Old Spatial {"type": "Polygon", "coordinates": [[[-160.0, 17.0], [-64.0, 17.0], [-64.0, 50.0], [-160.0, 50.0], [-160.0, 17.0]]]}
    Progress underDevelopment
    Spatial Data Service Type
    Spatial Reference System
    Spatial Harvester True

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