Private well answer guide

Black Stains in Well Water: Manganese and Infant Safety

Black stains may indicate manganese. If infants use the water, test manganese and consider alternate water for formula until results are reviewed.

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What to test

Test manganese, iron, pH, and bacteria with a certified lab.
Use another safe water source for infant formula if manganese is elevated or unknown.
Inspect filters and treatment media for black fouling.
Choose oxidizing filtration or other treatment based on manganese form and pH.

Elevated manganese can be a concern for infants. Use local health guidance and lab results when deciding on formula water.

Sometimes at low levels, but manganese treatment often needs oxidation and filtration depending on water chemistry.

Understand bacteria present/absent results and what they mean for private wells.

See recommended lab panels after flooding, repairs, and contamination events.

Compare odor, bacteria, and treatment clues before choosing equipment.

Keep your well history

Save test history, set annual reminders, compare results over time, and create a shareable report for your family or water professional.