Water quality · IN

Indiana Water Quality (2026)

Limestone aquifers produce some of the hardest water in the Midwest; many utilities serve water at 12+ gpg.

Our Indiana coverage focuses on the 1 metros below: Indianapolis. Each city page lists the utility's water source, hardness in grains per gallon, any contaminants flagged above EWG's stricter health guideline, and the whole-house system type that matches that specific profile, not a generic recommendation copied across the state.

If your Indiana city is not in the list yet, the nearest covered metro is usually a reasonable proxy: regional source water and treatment plants are typically shared across nearby municipalities. Private wells in Indiana are a different story and need a mail-in lab panel, the utility CCR will not apply.

Sources: USGS