Environmental

A Maine property owner discovers their well water contains coliform bacteria. This is most likely caused by:

ARadon gas in the bedrock
BContamination from a failing septic system or surface water infiltration✓ Correct
CArsenic from granite bedrock
DIndustrial pollution from a nearby factory

Explanation

Coliform bacteria in well water typically indicates contamination from a failing septic system, animal waste, or surface water infiltration — not radon or arsenic. It is a serious health concern requiring treatment.

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