‘No safe level’ of arsenic found in groundwater. Study estimates 15,000 cancer cases could stem from chemicals in California tap water. By Nadia Kounang
Much of the cancer risk was driven by arsenic contamination. These systems were some of the smallest systems in the state, serving 10,000 residents or less, and relied heavily on groundwater.
“Arsenic is going to be an issue with groundwater in certain areas” said Stoiber.
Arsenic contamination in drinking water can result both from arsenic that naturally occurs because of geology as well as from industrial and agricultural exposure.
Even very low levels of arsenic are considered to be highly carcinogenic.
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