EPA Office of Water (OW): 303(d) Listed Impaired Waters, California (streams, 2004)

Jan 14, 2011 (Last modified May 12, 2011)
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Description:
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://www.epa.gov/owow/tmdl/guidance.html 303(d) Waterbodies are coded onto NHD linear and area features to create Linear, Polygonal and Point Events. Point events represent impaired waterbody segments that do not fall on an NHD reach. 303(d) Waterbodies are coded onto NHD Waterbody reaches (region.rch) to create datasets. In addition to NHD reach indexed data there may also be custom event data (point, line, or polygon) that are not associated with NHD 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 NHD.

Data Provided By:
US Environmental Protection Agency, Office of Water
Content date:
2004
Citation:
Title: EPA Office of Water (OW): 303(d) Listed Impaired Waters NHD Indexed Dataset
Credits: US Environmental Protection Agency, Office of Water
Publication Date: 20100108
Contact Organization:
US Environmental Protection Agency, Office of Water
Contact Person(s):
Use Constraints:
The reach indexing review site is designed for state review of Clean Water Act Section 303(d) spatial data. Research Triangle Institute (RTI), under contract with EPA, georeferenced (or indexed) the states' impaired waters to the National Hydrography Dataset (NHD). EPA would like each state to have the opportunity to review the indexing work. Reviewers are asked to assess the accuracy of 303(d) reach indexing (georeferencing) efforts. More specifically, reviewers are asked to evaluate whether impaired waters are assigned to the appropriate reaches and to assess the accuracy of the locational information. When using this data in a spatial query, errors in determining the overlap can occur. The errors can be grouped as follows: (1) False Positives occur when the locational information is either incorrect or not of sufficient quality to determine its exact location. (2) False Negatives occur when locational information is missing or not available. (3) In addition to the entity locational information, errors, although few, may also exist in the spatial network of rivers, streams, and other waterbodies that comprise the National Hydrography Dataset (NHD) jointly maintained by USGS and USEPA. Errors in the NHD may contribute both to false positive and false negative readings. 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. Acknowledgment of the EPA would be appreciated.
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Tags:
water pollution, clean water act
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