An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

National Aquatic Resource Surveys

National Rivers and Streams Assessment 2013-2014 Results

The NRSA 2013-14 reports on the quality of rivers and streams in the conterminous United States.

Key Findings

oregon stream

View key findings from the National Rivers and Streams Assessment 2013-14.

Ecoregional Results

Thumbnail of Ecoregional Results Storymap

Coming soon! View NRSA 2013-14 results for each of the nine ecoregions.

Reports and Data

Report Thumbnail

View the public report, technical support document, and data files.

NRSA Data Dashboard

Thumbnail of NRSA dashboard

Coming soon! View results and download customized charts with the NRSA dashboard.