Despite efforts to reduce the amount of arsenic in drinking water systems across the U.S., not all communities have benefited from these efforts equally.

A study published in the journal Environmental Health Perspectives earlier this month describes the regions in which arsenic remained prevalent in public drinking water supplies after the Environmental Protection Agency (EPA) adjusted its regulations in 2006.1 Researchers found that smaller communities in the Southwest, places reliant on groundwater systems, and Hispanic communities were more likely to have continued high levels of arsenic contamination.

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