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Ohio's Ground Water Quality
Characterization Program:
Major Aquifers in Ohio
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 Ohio's aquifers can be divided into three major types of productive aquifers. These are:
- Sand and Gravel Aquifers
- Sandstone Aquifers
- Carbonate Aquifers
The sand and gravel valley aquifers are distributed through the state. The valleys these sands fill are cut into sandstone and shale in the eastern half of the state and into carbonate aquifers in the western half of the state. The sandstone and carbonate aquifers generally provide sufficient production for water wells except where dominated by shale, as in southwest Ohio.
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