Skip to content
EPA Environmental Dataset Gateway
EPA Office of Water (OW): 305(b) Waters as Assessed NHDPlus Indexed Dataset
US Environmental Protection Agency
The 305(b) program system provide assessed water data and assessed water features for river segments, lakes, and estuaries designated under Section 305(b) of the Clean Water Act. 305(b) waterbodies are coded onto NHDPlus v2.1 features creating area, point and linear events representing assessed and non-assessed waters. In addition to NHDPlus reach indexed data there may also be custom events (point, line, or area) that are not associated with NHDPlus and are in an EPA standard format that is compatible with EPA's Reach Address Database. These custom events are used to represent locations of 305(b) waterbodies that are not represented well in NHDPlus.
To identify the spatial extent of waters listed under the 305(b) program attributed as being assessed in the ATTAINS database. These waters can be linked to the 305(b) information stored in the EPA's Assessment and TMDL Tracking and Implementation System (ATTAINS) for query and display. Use the Source_FeatureID field and Cycle_Year field to link indexed assessed waters to the EPA's ATTAINS Database.
Time Period of Content
West Bounding Longitude:
East Bounding Longitude:
North Bounding Latitude:
South Bounding Latitude:
None. Please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated.
accessed waters, 305B, clean water act, map service, waters10, listed waters, shapefile, feature service, point source, GIS, EPA, Stream, reach
Metadata Reference Information
Metadata Standard Name:
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version:
The EDG is a metadata portal that is part of
EPA's System of Registries
. Please read EPA's
Privacy and Security Notice
Access EPA's National Geospatial Home Page
Access EPA's Intranet Geospatial Home Page