Water Quality in the Western Lake Michigan Drainages, Wisconsin and Michigan, 1992-95
Median concentrations of lead and mercury in streambed sediment exceeded the "lowest effect level" at urban and large river sites (see table at right). Lead is a known urban contaminant whose historical source is probably gasoline (Callender and Van Metre, 1997).
Return to Urban Areas are a Source of Trace Elements and Organic Compounds