Environmental

In Maine, arsenic contamination in well water is a significant concern primarily because:

AIt is caused by agricultural runoff
BIt occurs naturally from arsenic-bearing minerals in Maine's bedrock✓ Correct
CIt comes from old paint in rural homes
DIt is found only near industrial sites

Explanation

Arsenic occurs naturally in Maine's bedrock geology, particularly in parts of southern and central Maine. The Maine CDC recommends all private well owners test for arsenic.

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