EPA Environmental Dataset Gateway


Open/Close section Identification Information
Title: EPA Office of Water (OW): 303(d) Listed Impaired Waters by Causes of Impairment and Probable Sources
Abstract: Under Section 303(d) of the CWA, states, territories, and authorized tribes (referred to here as states) are required to develop lists of impaired waters. These are waters that are too polluted or otherwise degraded to meet the state water quality standards. The law requires that these jurisdictions establish priority rankings for waters on the lists and develop TMDLs for these waters. Note: the CWA Section 303(d) list of impaired waters does not contain impaired waters with 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. For more information, please see EPA's Integrated Reporting Guidance at: http://www.epa.gov/tmdl/integrated-reporting-guidance
Purpose: The data can be used to identify distribution of impaired waters within each state for causes of impairment of interest. The attribute information provided (e.g., cause(s) of impairment, location, waterbody name) is reported by States to EPA under CWA Section 303(d), and can be associated with the geospatial information (303(d) Listed Impaired Waters NHD Indexed Dataset found at http://www.epa.gov/waterdata/waters-geospatial-data-downloads). The attribute information can be viewed via ATTAINS available at the AskWATERS Expert Query at http://iaspub.epa.gov/pls/waters/f?p=ASKWATERS:MAIN_MENU. Please note that a water can be identified on a State’s 303(d) list as impaired for more than one cause of impairment and be identified as having more than one probable source. Please be mindful of this information when aggregating the attributes for analysis needs.
Open/Close section Distribution Information
Download URL: https://www.epa.gov/waterdata/waters-geospatial-data-downloads
Open/Close section Time Period of Content
Publication Date: 20150501
Progress: Completed
Frequency: None Planned
Open/Close section Single Date
Date: 20150501
Currentness: Publication date
Open/Close section Spatial Domain
West Bounding Longitude: -180
East Bounding Longitude: 180
North Bounding Latitude: 90
South Bounding Latitude: -90
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Open/Close section Constraints
License https://edg.epa.gov/EPA_Data_License.html
Access: None
Use: Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
Open/Close section Theme Keywords
Theme Topics: impaired waters, 303d, TMDL, clean water act, listed waters, total maximum daily loads, TMDLs, CWA, point source, 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: {631CE863-2DCD-4DA3-8F46-9D4D570E6A48}
Metadata Date Stamp: 2016-05-16
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998