National Water Quality Program

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The National Water Quality Program provides an understanding of water-quality conditions; whether conditions are getting better or worse over time; and how natural features and human activities affect those conditions.

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Featured Study: Flow Modification of the Nation's Streams

Featured Study: Flow Modification of the Nation

A new USGS study reports that human management of land and water resources have modified natural patterns of streamflow along more than 1.2 million miles of U.S. streams. Flow modification was associated with losses of native fish or invertebrates.

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New information on toxicity of fipronil to stream organisms

New information on toxicity of fipronil to stream organisms

The common insecticide fipronil and some of the compounds it degrades to are more toxic to aquatic insects, such as mayflies and stoneflies, than previously estimated, reports a new USGS study.

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News

Date published: October 23, 2020

Common insecticide is more harmful to aquatic ecosystems than previously thought

The insecticide fipronil and some of the compounds it degrades to are more toxic to aquatic insects, such as mayflies and stoneflies, than previously estimated, reports a new study from the USGS Regional Stream Quality Assessment.

Date published: September 28, 2020

Surface-water nutrient and sediment mappers are now available

SPARROW mappers are interactive tools that allow users to evaluate streamflow and nutrient and sediment conditions as well as the importance of different sources of contaminants in a selected river basin. Data can be visualized at different scales using maps and interactive graphs and tables.

Date published: September 16, 2020

New Study Identifies Pesticide Mixtures in U.S. Rivers and Streams

A mix of multiple pesticides is common in many U.S. streams, reports a new study by the U.S. Geological Survey National Water Quality Program.