This just out from the EPA in the USA…The EPA revised a rule on arsenic in drinking water results show a reduction in lung , bladder and skin cancers.
In 2006 the EPA reduced the amount of arsenic allowed in public water systems to 10 milligrams per liter, down from 50 milligrams. This rule does not apply to private wells.
Through an ongoing nation wide health survey, researchers compared urinary arsenic levels in 2003, before the rule went into effect…against urinary arsenic levels from 2014 or after the arsenic rule change.
Over 14,00 people were in the study, and adjustments were considered to account for arsenic exposure through smoking or diet.
A 17% reduction in arsenic levels was found among those using public water systems. This translates into the ruling causing 200-900 fewer lung and bladder cancers and fifty fewer skin cancers annually.
The researchers try to provide information in a way that is useful for policy makers. They understand that water treatment to remove arsenic is expensive, and difficult to afford for smaller municipalities. Eliminating arsenic completely should be the goal, but we must be realistic.