Understanding Your Well Water in Ohio

1.8 million Ohioans rely on private wells. Nobody tests that water but you. Ohio's agricultural heartland, glacial geology, and industrial legacy each leave their mark on what comes out of your tap.

The Numbers

1.8M Ohioans on private wells (16% of population)

850K+ well records in Ohio DNR database

88 county health districts regulate wells independently

0 federal regulations on private well testing

Why It Matters

Ohio's groundwater tells two geological stories. The northern two-thirds of the state was reshaped by glaciers, leaving deep deposits of sand, gravel, and clay that form productive but mineral-rich aquifers. The southern third was untouched by ice, with wells drilled into ancient bedrock. Both regions produce water that's hard, iron-rich, and shaped by what's happening on the surface — especially agriculture.

Unlike public water systems, private wells are not regulated by the EPA. No one tests your water, treats your water, or notifies you if something is wrong. In Ohio, that responsibility falls to 88 individual county health districts — creating an information fragmentation problem this site exists to help solve.

Nitrates

Ohio's #1 private well concern. Agricultural fertilizer and manure contaminate groundwater across the state. Dangerous for infants. Cannot be removed by boiling.

Hard Water

Ohio well water is hard to extremely hard — 200 to 500+ PPM statewide. It destroys plumbing, appliances, and your patience. A softener isn't optional.

Iron & Manganese

Orange stains from iron. Black stains from manganese. Nearly universal in Ohio wells, especially in glacial drift and sandstone aquifers.

Legacy Industrial

VOCs from old manufacturing in the Akron-Canton-Youngstown corridor. TCE plumes, petroleum contamination. Know your area's history.

Find Your Community

We've researched water quality conditions for communities across Ohio that rely heavily on private wells. Each guide covers local geology, specific contaminants, testing recommendations, and treatment options.