Canada's Top Five Federal Contaminated Sites to Cost Taxpayers Billions to Clean Up

There are more than 20,000 locations listed in the federal contaminated sites inventory, from dumps and abandoned mines to military operations on federal land.

Environment and Climate Change Canada says that after Giant Mine, the four most expensive cleanups are the Faro Mine in Yukon, the Port Hope Area Initiative in Ontario, Esquimalt Harbour in British Columbia and Yukon's United Keno Hill Mine.  With a cost estimate of $4.38 billion, remediation of the Giant Mine, one of the most contaminated sites in Canada, is also expected to be the most expensive federal environmental cleanup in the country's history.