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Nutrient Impaired 303(d) Streams for the Pacific Northwest

Metadata Updated: July 8, 2024

Under section 303(d) of the 1972 Clean Water Act, states, territories, and authorized tribes are required to develop lists of impaired waters. These impaired waters do not meet water quality standards that states, territories, and authorized tribes have set for them, even after point sources of pollution have installed the minimum required levels of pollution control technology. The law requires that these jurisdictions establish priority rankings for waters on the lists and develop TMDLs for these waters” (U.S. Environmental Protection Agency, 2011). Waterways represented in this data set are a subset of these EPA 303 (d) listed streams that were classified as nutrient impaired. Nutrient impaired streams include those listed for nutrients, agriculture, crop sources, pH, dissolved oxygen, chlorophyll a, nitrate, phosphorus, and nitrogen. Total phosphorus and total nitrogen values attributed to stream reaches are based on EPA Level III Ecoregions aggregations for the National Nutrient Strategy values (U.S. Environmental Protection Agency, 2000). Values are based on 25th percentiles for aggregate nutrient reference conditions for both phosphorus and nitrogen. Data relate to a 2002 time period, with data collected from each of the state agencies as close to that period as possible. See processing steps for more detail on individual state data sets and time periods.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date July 8, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date July 8, 2024
Publisher U.S. Geological Survey
Identifier USGS:225ac508-529b-4f60-804e-99645327988a
Data Last Modified 20201117
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 1f7eba3b-89d5-49b6-86f1-7cf404c8551b
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -127.053324,40.079098,-110.8311,50.520295
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 07f2b60a8ed6fb45bf0cced7b124c4bd474491898d06511e8936b70c9b852990
Source Schema Version 1.1
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