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U.S. EPA Rivers & Streams Assessment 2013-14
2013-14 Estimates, Change, and Long-Term Change |
% of Miles (2013-14)
Direction
†
* Indicates statistically significant difference (95% confidence) between time periods compared. This difference is also represented by a darker-colored long-term change symbol.
†Surveys were conducted in 2004, 2008-09 (shown here as “08/09” for brevity), and 2013-14 (“13/14”). Streams were surveyed beginning in 2004; rivers were surveyed beginning in 2008-09.
‡ The microcystins benchmark is 8 micrograms per liter (EPA’s 2019 recommended swimming advisory level). The enterococci benchmark is 1,280 calibrator cell equivalents/100 milliliters (EPA's 2012 recommended water quality criterion for protecting human health in ambient waters designated for swimming). The mercury benchmark is 300 parts per billion of methylmercury (EPA’s 2001 recommended fish tissue-based water quality criterion).
U.S. Environmental Protection Agency (USEPA). 2020. National Rivers and Streams Assessment 2013-2014: A Collaborative Survey. Interactive NRSA Dashboard.https://riverstreamassessment.epa.gov/. Accessed on . Last modified on .
% of Miles (2013-14)
Direction
Diff. Betw. 2008-09 & 2013-14 (% Pts.)†
* Indicates statistically significant difference (95% confidence) between time periods compared. This difference is also represented by a darker-colored long-term change symbol.
†Surveys were conducted in 2004, 2008-09 (shown here as “08/09” for brevity), and 2013-14 (“13/14”). Streams were surveyed beginning in 2004; rivers were surveyed beginning in 2008-09.
U.S. Environmental Protection Agency (USEPA). 2020. National Rivers and Streams Assessment 2013-2014: A Collaborative Survey. Interactive NRSA Dashboard. https://riverstreamassessment.epa.gov/. Accessed on . Last Modified on .
‡ The microcystins benchmark is 8 micrograms per liter (EPA’s 2019 recommended swimming advisory level). The enterococci benchmark is 1,280 calibrator cell equivalents/100 milliliters (EPA's 2012 recommended water quality criterion for protecting human health in ambient waters designated for swimming). The mercury benchmark is 300 parts per billion of methylmercury (EPA’s 2001 recommended fish tissue-based water quality criterion).
U.S. Environmental Protection Agency (USEPA). 2020. National Rivers and Streams Assessment 2013-2014: A Collaborative Survey. Interactive NRSA Dashboard. https://riverstreamassessment.epa.gov/. Accessed on . Last Modified on .
Relative Extent (% of Miles with Poor Quality)
Relative Risk
Attributable Risk
U.S. Environmental Protection Agency (USEPA). 2020. National Rivers and Streams Assessment 2013-2014: A Collaborative Survey. Interactive NRSA Dashboard. https://riverstreamassessment.epa.gov/. Accessed on May 1, 2020. Last Modified on .
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U.S. EPA Rivers & Streams Assessment 2013-14
Percentage of Rivers & Streams in Each Quality Category (2008-09 to 2013-14)†
Estimates, Direction, and Difference
Indicator | Aggregation
Quality
% of Miles (2013-14)
Direction
Difference Betw. 2008-09 & 2013-14 (% Pts.)†
*Indicates statistically significant difference (95% confidence) between time periods compared. This difference is also represented by a darker-colored long-term change symbol.
†Surveys were conducted in 2004, 2008-09 (shown here as “08/09” for brevity), and 2013-14 (“13/14”). Streams were surveyed beginning in 2004; rivers were surveyed beginning in 2008-09.
U.S. Environmental Protection Agency (USEPA). 2020. National Rivers and Streams Assessment 2013-2014: A Collaborative Survey. Interactive NRSA Dashboard. https://riverstreamassessment.epa.gov/. Accessed on . Last Modified on .
