Biological Monitoring - Data in some cases is preliminary pending final checks
About the B-IBI:
To make a broad assessment of ecosystem health in our streams, Streamkeepers uses the Benthic Index of Biological Integrity (B-IBI), a stream-health grading system based on aquatic invertebrates found at monitoring sites, developed and calibrated at the University of Washington and further calibrated by a consortium of Puget Sound local governments.
Regional B-IBI procedures, 2011-
Streamkeepers' B-IBI procedures, 1998-2011
Use of the B-IBI for water-quality assessments in WA State under the Clean Water Act: Prior to 2004, biological assessments were not used in Washington State for further investigation of pollutant sources under the federal Clean Water Act. In 2004, Streamkeepers was able to establish a new precedent, requiring that the Washington State Dept. of Ecology (DOE) perform further assessment of stream segments where biological impairment has been found. DOE´s 2006 revised Water Quality Program Policy reflects a new approach to the use of biological assessment.