Small Streams Toxicity and Pesticide Study
1999 Monitoring Results
The Small Streams Toxicity/Pesticide Study is a study intended to assess the possible biological implications associated with the presence of pesticides in selected small streams in King County. This study included analysis of: approximately 150 different pesticides, dissolved and total metals, and other contaminants; toxicity using up to three different test species (Ceriodaphnia dubia, Lemna minor, and Selenastrum capricornutum); dissolved and total organic carbon and total suspended solids. Samples were collected during spring storms, summer baseflows, and fall storms. In 1999, samples were collected from Lyon, Juanita, Lewis, and Rock Creeks. Rock Creek was used as the reference stream for toxicity testing. Additionally, a set of effects threshold levels were identified for all contaminants detected during this study that do not have water quality standards.
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