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. R2GIS selected out the Region 2 extent plus a one mile buffer from the National RAD 303d 05/01/2015 SNAPSHOT ESRI file geodatabase. R2GIS created two relationship classes on each of the three R2 RAD 303d SNAPSHOT 20150501 layers ( points, lines and areas). The relationships were built to the attgeo_303dcaussrce and rad_303d_sfid tables from the national RAD 303d 303d SNAPSHOT 20150501 database (selected on R2 extent plus one mile). Information on the attgeo_303dcaussrce table can be found at: 303(d) Listed Impaired Waters by Causes of Impairment and Probable Sources Location: http://www.epa.gov/waters/data/downloads.html#303(d) Listed Impaired Waters Entity Type Label: ATTGEO_303DCAUSSRCE Entity Type Definition: 303D Program Attributes Entity Type Definition Source: EPA ATTAINS. The rad_303d_sfid table provides information on the Start Date, Cycle Year, Event Count, Load Date, Update Date and area and length of features. Users should understand that the 05/01/2015 RAD 303d snapshot was made up of 303d reporting for the 2012 Cycle for NY, the 2010 cycle for NJ, mostly the 2012 cycle for PR and the 2012 cycle for VI. Since the one mile buffer used in the selection operation included hydrological features from CT, VT and PA, the Integrated Reporting cycles for this data ranges from 2002 (for PA) to 2012 for CT and VT.
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: -94.043107
East Bounding Longitude: -62.190812
North Bounding Latitude: 45.030458
South Bounding Latitude: 16.737700
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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
Metadata Date Stamp: 2016-05-16
Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998