Environmental

A Wisconsin property owner discovers their well water contains elevated nitrate levels above the state health standard. This most likely indicates:

AExcessive iron from rock formations
BAgricultural runoff or septic system contamination✓ Correct
CNaturally occurring mineral deposits
DOld lead plumbing

Explanation

Elevated nitrates in Wisconsin well water commonly result from agricultural fertilizers and animal waste runoff or failing septic systems seeping into groundwater.

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