Authors: R. A. Smith
Author Affiliation: LCWC
Journal: LCWC Report; July 2025
Waters and selected fish species were examined for perfluorooctane sulfonate (PFOS) content to develop baseline data. PFOS concentrations recovered from LC waters were at, or below, the instrumentation detection limit of 1.25 part per trillion. Levels of PFOS found in fish muscle was consistently lower than in fatty tissue. Concentrations of PFOS in Yellow Perch (Perca flavescens) averaged 12.8 parts per billion, a similar range reported by the MI Department of Environment, Great Lakes and Energy (EGLE). As of 2023, PFOS levels in LC fish are considered the standard to which fish from other MI waters bodies are compared by MDNR and EGLE.