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Water: Monitoring & Assessment

Wadeable Streams Assessment (WSA) Background Materials

The Wadeable Streams Assessment: A Collaborative Survey of the Nation's Streams (PDF)  (WSA) is a first-ever statistically-valid study of the biological condition of small streams throughout the U.S. It establishes a national baseline we can use to compare to results from future studies. This information will help us evaluate the successes of our national efforts to protect and restore water quality.

You will need Adobe Acrobat Reader to view the Adobe PDF files on this page. See EPA's PDF page  for more information about getting and using the free Acrobat Reader.

Fact Sheets

Field Methods

Quality Assurance

Site Evaluation

Laboratory Methods

Other Background Material

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