California tap water exposes millions to cancer-causing chemicals: Experts predict 15,000 will develop the disease from arsenic, radioactive toxins and more

California’s drinking water may be responsible for 15,000 cancer cases, a new study suggests.

The public water supply is monitored by both federal and state regulators and is tested for contaminants on a regular basis.

But the health risks posed by whatever is in the drinking water are typically calculated on an individual basis – rather than according to the cumulative effects of water impurities.

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