Mostly. Concrete dominates Ohio installations; fiberglass and polyethylene are also approved. Steel tanks are obsolete (corrode through in 20-30 years). If your tank is steel, plan for replacement when next servicing.
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Concrete tanks dominate Cincinnati installations because they are inexpensive, well-suited to local soil conditions, and have a 50+ year typical lifespan. Fiberglass tanks (Norwesco, Snyder) are lightweight and resist corrosion, making them practical for tight-access installations or replacement projects. Polyethylene tanks (Infiltrator) are similar and increasingly common in new installations. Steel tanks were standard from roughly 1940 to 1980 and have been obsolete since concrete pricing dropped; steel corrodes through from the inside (driven by sulfide compounds) typically in 20-30 years, making any steel tank still in service well past its design life. If a Cincinnati home has a steel tank, the question is when (not if) it needs replacement; planning the replacement during routine maintenance is cheaper and less disruptive than waiting for a structural failure. Cincinnati steel-tank scenarios: any home built before 1980 in Greater Cincinnati that has not had its tank replaced is likely on a steel tank approaching or past end of life. Failure modes are usually structural (tank roof collapses) rather than gradual leakage, so the failure tends to be sudden and disruptive. Replacement to a modern concrete or polyethylene tank costs $5,000-$10,000 for the tank plus $2,000-$5,000 for excavation and connection.