EPA Environmental Dataset Gateway


Open/Close section Identification Information
Title: EPA Office of Water (OW): 303(d) Listed Impaired Waters NHDPlus Indexed Dataset
Abstract: 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: http://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.
Purpose: To identify the spatial extent of waters listed under 303(d). These waters can be linked to the 303(d) information stored in EPAs Assessment and TMDL Tracking and Implementation System (ATTAINS) for query and display via EPAs WATERS Expert Query Tool. The Source_FeatureID and Cycle_Year fields in the indexed dataset can be linked to the listed_water_id and cycle in EPA's Assessment and TMDL Tracking and Implementation System (ATTAINS).
Open/Close section Distribution Information
Resource(Server) URL: https://watersgeo.epa.gov/arcgis/rest/services/OWRAD_NP21/303D_NP21/MapServer/
Download URL: https://www.epa.gov/waterdata/waters-geospatial-data-downloads
Open/Close section Time Period of Content
Publication Date: 20150501
Progress: In work
Frequency: Continual
Open/Close section Single Date
Date: 20150501
Currentness: Publication date
Open/Close section Spatial Domain
West Bounding Longitude: -160
East Bounding Longitude: -64
North Bounding Latitude: 50
South Bounding Latitude: 17
Zoom to the metadata envelope
Open/Close section Constraints
License https://edg.epa.gov/EPA_Data_License.html
Access: None.
Use: None.
Open/Close section Theme Keywords
Theme Topics: impaired waters, 303d, TMDL, clean water act, National Hydrography Dataset, NHD, NHDPlus, listed waters, shapefile, total maximum daily loads, TMDLs, feature service, CWA, point source, GIS, EPA, Stream, reach
Open/Close section Contact Information
Originator: US Environmental Protection Agency, Office of Water
Email: reid.wendy@epa.gov
Address Type: mailing address
City: Washington
State: DC
Postal Code: 20460
Telephone: 202-566-1705
Open/Close section Metadata Reference Information
File Identifier: {66F27299-6B1B-42BF-8AA0-1127D7646631}
Metadata Date Stamp: 2016-05-16
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998