This report profiles the health of watersheds in a region by summarizing information from EPA's Index of Watershed Indicators. This index characterizes the condition and vulnerability of aquatic systems, and provides a summary measure of overall watershed health.
Data Source: Scorecard's profiles of watershed indicators are derived from U.S. EPA's Index of Watershed Indicators, a science-based but limited analysis that uses varying amounts and quality of data. The most recent available Index is from 1999 and is based on information gathered between 1990 and 1999.
NOTE: Data quality problems limit the reliability of comparisons across geographic areas. IWI makes use of data collected by a regulatory and scientific agencies for a variety of different purposes, and relies on extensive scientific judgement to construct indicators of watershed health. Because of data limitations, differences in IWI indicator scores may not correspond to meaningful differences in environmental quality.