For sale: 148 acres between Broad Run Farms and Countryside. "Many acres of parkland for horseback, walks, bike paths, gardens." List Price: $2.5 million.

One caveat: About 35 of those acres are the site of the Hidden Lane Landfill. Officials have identified it as the probable source of trichloroethylene (TCE), a carcinogen that has contaminated 22 wells in the Broad Run Farms community.

A developer put a contract on the property in February, the same month that the Loudoun Department of Health started testing wells to see if they contained TCE. The real estate listing also describes the landfill as "cleared by the EPA." The Environmental Protection Agency put the property on the Superfund list in 1988 after receiving a complaint about a chemical waste at the site. It was removed from the list in 2003, because information available at the time did not demonstrate a significant potential for hazardous waste, Office of Solid Waste records show. At the urging of county and state officials, Broad Run Farms residents are now gathering signatures to petition the EPA to take a second look. They want the federal agency to designate it as a Superfund, so the EPA will do the clean up and go after the people or business responsible for the contamination for payment.

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Bruce Tulloch, vice chairman of the Board of Supervisors, said a developer had a contract on the property, with plans to build a housing development. He said he understood why the developer had backed off on the project after learning about the TCE contamination. "Anybody that would consider buying that landfill should get an examination from the neck up," he said.