Radium may taint well water -
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Published on: 7/3/2001
Last Visited: 2/22/2002
"We're still pretty far away from linking the cancer to the water," said Anthony S. Navoy, assistant district chief for the USGS state office in Ewing, which is assisting Toms River cancer investigators with ground water studies.
Most of the tainted wells cited by the USGS are clustered in the southwest counties of Camden, Gloucester, Salem and Cumberland.
But Navoy said geologists have clues showing that farm fertilizer plays a role in the problem too.
"We see a chemical signature relative to old agricultural land" where fertilizer has been used for years, along with lime to counteract the natural acidity of sandy soils, Navoy said.
Geologists think the same principle of ion exchange that lets ordinary water softeners remove radium from water is at work under old farm fields.In acidic ground water, ions from fertilizer may help "mobilize" radium ions so they can be drawn into wells, Navoy said.
The state Department of Environmental Protection first warned of radium contamination in January 1989, affecting parts of nine southern New Jersey counties.Last year DEP officials again urged private well owners who draw water from the Cohansey formation to have their water tested for radium.
Unlike chemical contamination, radium is easily removed by household-water-softening equipment that substitutes sodium for mineral ions in so-called "hard" water, health and environmental workers say.
In Ocean County, the health department estimated 90 percent of people using private wells used ion-exchange water softeners even before last year's warnings.
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When tracking radium levels, researchers use "raw water" taken directly from wellheads, not the softened water from faucets, Navoy explained.