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Environmental Modeling Community of Practice

303(d) Listed Impaired Waters

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Geospatial data for 303(d) Impaired Waters are available as prepackaged national downloads or as more current GIS web and data services. EPA provides geospatial data in a variety of formats including Geographical Information Systems (GIS) compatible shapefiles and geodatabases, as well as ESRI and OGC web mapping services.

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Current State Geospatial Data

You may download geospatial files representing the most up-to-date publicly available Water program data by State (or custom area) from EPA's Environmental Dataset Gateway (EDG) Clip N Ship Site. For ATTAINS 303(d) geospatial data, the Table of Available Cycles in the RAD lists the most recent ATTAINS cycle for which GIS data are available for each state.

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National Geospatial Datasets

National geospatial datasets provided on this page are produced and periodically updated by EPA using state-submitted data. These datasets are created based on information in the Reach Address Database (RAD) on the date of extract. To be included in this dataset states and other jurisdictions must have submitted information to the program database and be indexed to NHDPlus reached hydrography. Due to the nature and complexity of providing a national snapshot of program data, EPA has provided a fact sheet to accompany and clarify the contents of each dataset.

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ATTAINS Program Data

303(d) Listed Impaired Waters NHDPlus Indexed Dataset with Program Attributes
Download 303d Impaired Waters Shapefiles(73 pp, 173 MB) / Zip file
303d Impaired Waters OGC GeoPackage(5 pp, 201 MB) / Zip file
303d Impaired Waters ESRI 10.x File Geodatabase(130 pp, 113 MB) / Zip file
303d Impaired Waters Attributes Only(1 pg, 10 MB) / Excel
303d Impaired Waters Changelog(1 pg, 19 K, May 1, 2015) / Excel
Metadata Spatial and attribute metadata is located at the EPA Environmental Dataset Gateway.
Additional Information

For this dataset as of 2014, Reach Address Database events have been indexed to NHDPlus v2.1 Exit hydrology (previous versions utilized NHDPlus v1.0 hydrology).

Fact Sheet
[Pending update to fact sheets: Users should now obtain state-level geospatial data at EPA's Environmental Dataset Gateway (EDG) Clip N Ship Site.]

303d Impaired Waters by Causes and Sources(1 pg, 35 K) / Word document

Pollution Category summary document

Geospatial and Attribute Linkage Information Use the provided ESRI_KEY for joining tables.  Note that there is a many-to-many relationship between attributes and geospatial records.

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