New USGS Interactive Map Looks at Long-term Water Quality Changes

USGS Mapper

USGS has launched a new interactive map that provides a comprehensive, long-term look at changes in the quality of our Nation’s rivers and streams over the last four decades. For the first time, monitoring data collected by 74 organizations at almost 1,400 sites have been combined to provide a nationwide look at changes in the quality of our rivers and streams in the 40 years since passage of the Clean Water Act.  The interactive map can be used to track trends of 51 water-quality constituents and 38 aquatic-life metrics at nearly 1,400 sites during four time periods between 1972 and 2012.  For more information about this and other maps, visit the USGS website.

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