Are Toxic Vapors Seeping Into Your Home?

Proving once again that toxic chemicals don't simply disappear when they are dumped or forgotten, scientists and regulators are turning up more cases of dangerous vapors encroaching on residences. The toxic chemicals have been linked to a number of serious health problems, including cancer — and investigators have found them in unexpected places around the country.

Those living in the homes had no idea their houses were contaminated, because the chemicals have no color or odor. The problem is called vapor intrusion and it can occur when volatile chemicals evaporate from soil or groundwater. The fumes can then seep into basements and other structures.

The problem can be particularly acute around Superfund sites, or possibly around brownfields that are in the process of reclamation and redevelopment. On New York's Long Island, officials are investigating the possibility of toxic vapor seepage from dozens of hazardous waste sites once thought to be cleaned up or nearly so. Environmental and health officials with state and federal agencies are scrutinizing such sites now for vapor intrusion.

A number of the chemicals thought to be involved, such as trichloroethylene (TCE), are suspected carcinogens. Recent research has suggested vapor seepage may occur at much lower chemical concentrations than previously believed. A number of homes have had filtration systems installed to deal with the problem.

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