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This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

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Watershed Index Online (WSIO)

  • National Library of Watershed Indicators and Tools

    Download reference indicator factsheets for new HUC12 watershed indicators

information

Watershed Index Online has been renamed to the Restoration and Protection Screening (RPS) Indicator Database. This webpage is no longer maintained. Visit the EPA RPS website for up-to-date information and resources to support strategic planning of priority waters and watersheds.

About Watershed Index Online

  • Introduction to WSIO
  • WSIO Benefits
  • Watershed Indicator Data Library

Watershed Comparison Tools 

  • Download and Use the WSIO Tool
  • State-Specific Recovery Potential Screening (RPS) Tools 
  • Training Support: New Indicator Reference Sheets
Related EPA Topics
  • Healthy Watersheds 
  • Recovery Potential Screening
  • Healthy Watersheds Protection 
  • How's My Waterway
  • Water Quality Assessment (ATTAINS) Information System
Contact Us About the Watershed Index Online to ask a question, provide feedback, or report a problem.
Last updated on January 17, 2025
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