The town of Cardin, Oklahoma is located within the Tar Creed Superfund site causing toxic areas and therefore reducing the population to what number in November 2010?
Tar Creek Superfund site Tar Creek Superfund site is a United States Superfund site, declared 1983, located in the cities of Picher and Cardin, Northeastern Oklahoma. From 1900 to the 1960’s 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.
List of Superfund sites in Montana This is a list of Superfund sites in Montana designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law. The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations. These locations are known as Superfund sites, and are placed on the National Priorities List (NPL). The NPL guides the EPA in "determining which sites warrant further investigation" for environmental remediation. As of March 10, 2011, there were 16 Superfund sites on the National Priorities List in Montana. One additional site has been proposed for entry on the list. No sites have yet been removed from the list following clean up.