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Johnson County interns report 143 organisms in Blue River; 58% are pollution-sensitive
Summary
Two Johnson County stormwater interns said a macroinvertebrate survey of the Blue River found 143 organisms and that 58% belonged to pollution-sensitive groups — a common indicator of relatively low pollution in that reach.
A macroinvertebrate survey conducted on the Blue River by two Johnson County stormwater interns found 143 distinct organisms and a high share of pollution-sensitive taxa, the interns said.
Adele, a stormwater intern with Johnson County, said, "we actually found a 143 different organisms." Reid, also a stormwater intern, said, "Finding 58% of the sensitive group means that there's not that much pollution in the stream." Together they described sampling riffles and stirring substrate by foot to dislodge organisms for sorting and identification.
The interns framed the 58% figure as a water-quality indicator: higher percentages of sensitive taxa typically signal lower recent pollution and healthier habitat conditions. Adele said the site contains "lots of habitats," which she linked to the biologically diverse survey results.
The survey comments are observational field findings reported by the interns; no formal agency assessment or regulatory action was announced in the transcript. The interns said the work is part of their Johnson County stormwater internship fieldwork and helps them learn about water quality and local watersheds.
The county did not provide additional policy or follow-up steps in the transcript.
