<P> Tar Creek Superfund site is a United States Superfund site , declared 1983 , located in the cities of Picher and Cardin , Ottawa County , in northeastern Oklahoma . From 1900 to the 1960s lead mining and zinc mining companies left open chat piles behind until the present day . The dust has blown around the city containing these metals , cadmium , and others . The metals have also seeped into groundwater , ponds , and lakes , many of which still are used by children for swimming . Elevated lead , zinc and manganese levels in Picher children have led to learning disabilities and other problems . The EPA declared Picher to be one of the most toxic areas in the United States . </P>
<P> Tar Creek Superfund site is a United States Superfund site , declared 1983 , located in the cities of Picher and Cardin , Ottawa County , in northeastern Oklahoma . From 1900 to the 1960s lead mining and zinc mining companies left open chat piles behind until the present day . The dust has blown around the city containing these metals , cadmium , and others . The metals have also seeped into groundwater , ponds , and lakes , many of which still are used by children for swimming . Elevated lead , zinc and manganese levels in Picher children have led to learning disabilities and other problems . The EPA declared Picher to be one of the most toxic areas in the United States . </P>
when was tar creek named a superfund site
when was tar creek named a superfund site
1983
1983