Monitoring on the Chehalis River Basin showed that many segments of the watershed failed to meet water quality standards for fecal coliform and were declared impaired as of 2002.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- SP-12 Region 10 - Chehalis River Basin (PDF)(24 pp, 5 MB, May 4, 2011)