Environmental

In South Dakota, a property owner who finds an old buried cistern or septic tank on their property should:

ALeave it undisturbed since it's no longer active
BHave it properly abandoned (pumped, filled, or removed) per DENR standards to prevent collapse and contamination✓ Correct
CFill it with water to prevent collapse
DSimply cover it with soil without taking further action

Explanation

Abandoned cisterns and septic tanks pose risks including collapse (creating sinkholes), groundwater contamination, and methane gas accumulation. Proper abandonment following DENR standards is required.

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