Environmental

In Missouri, the discovery of naturally occurring arsenic in well water is a concern primarily in:

AUrban St. Louis only
BCertain geological formations, particularly in some Ozark and agricultural areas with alluvial aquifers✓ Correct
CThe Mississippi River delta only
DAll Missouri properties uniformly

Explanation

Naturally occurring arsenic is found in certain Missouri geological formations, particularly in some Ozark groundwater systems and alluvial aquifers. Well water testing is important in affected areas as arsenic is a serious carcinogen.

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