Arsenic in Your Well Water? Lung Cancer May Be Next

How scary is this?  Mice exposed to low levels of arsenic -- the amounts some of us may have in our ground water -- developed lung cancer.

According to newswise.com, mice exposed to low doses of arsenic in drinking water, similar to what some people might consume, developed this cancer, researchers at the National Institutes of Health have found.

 Arsenic levels in public drinking water cannot exceed 10 parts per billion (ppb), which is the standard set by the U.S. Environmental Protection Agency. However, there are no established standards for private wells, from which millions of people get their drinking water.

People in the northern suburbs of my town have discovered, to their horror, that their well water contains many things it shouldn't.  Including arsenic.

The researchers used a model that duplicates how humans are exposed to arsenic throughout their entire lifetime. In the study, the mice were given arsenic three weeks before breeding and throughout pregnancy and lactation, the Web site reports. Arsenic was then given to the offspring after weaning, and all through adulthood at concentrations relevant to human exposure. The researchers looked at the tumors in the adult offspring. 

“This is the first study to show tumor development in animals exposed to very low levels of arsenic, levels similar to which humans might be exposed,” said Michael Waalkes, Ph.D., lead author on the paper and director of the National Toxicology Program (NTP) Laboratory, at newswise.com. “The results are unexpected and certainly give cause for concern.”

The Web site notes that arsenic is present in the environment as a naturally occurring substance or due to contamination from human activity. Arsenic may be found in many foods, including grains, fruits, and vegetables, where it is present due to absorption from the soil and water. This study focused on inorganic arsenic, which often occurs in excess in the drinking water of millions of people worldwide, and has been previously shown to be a human carcinogen.

In the study, more than half of the male offspring mice developed significant increases in benign and malignant lung tumors at two low doses. Female offspring also developed benign tumors at the lower concentrations. Interestingly, the researchers did not find significant increases in lung tumors in either sex at the highest doses, the Web site points out.

“Although this is only one study, it adds to a growing body of evidence showing adverse health effects from very low exposures to arsenic, raising the possibility that no level of arsenic appears to be safe,” said Linda Birnbaum, Ph.D, director of the National Institute of Environmental Health Sciences (NIEHS) and NTP.




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