Published: Sep 29, 2010 3:34 PM EDT
Updated: Sep 29, 2010 12:34 PM EDT

SANFORD, Fla. (AP) - Two business properties in Central Florida have been put on the federal government's list of the most dangerously polluted sites in the United States.

The U.S. Environmental Protection Agency added to its Superfund list this week with an industrial property once used by General Dynamics Corp. near the Orlando suburb of Longwood and a longtime dry cleaners in downtown Sanford.

Officials say that toxic chemicals at the properties pose no immediate health risk, but they have found their way underground at both locations.

Central Florida has few properties listed as Superfund sites, a designation many communities seek to avoid because it lowers property values and damages an area's reputation.