Ohio Private Water Systems: Testing and Contractor Rules From OSU Watersheds

The Ohio State University watershed program page for well owners gives these points.

Testing

Use a state-certified lab. Ohio EPA publishes a list of certified labs.
The Ohio Department of Health advises regular testing of a few parameters such as total coliform, E. coli, nitrates and arsenic (examples, not a full list), to track quality over time.
Other tests depend on problems you notice or local concerns; your local health district can advise.
Retest after any treatment to confirm the problem is resolved.
The page does not give an exact test interval.

A registered private water system contractor must install, alter and repair a well.
Construction or alteration needs a permit from the local health district.
The page says the only enforceable standard for private systems is for bacteria. More than 4 MPN total coliform calls for cleaning and disinfecting the system; for E. coli the health-based standard is no detection, and professional disinfection is recommended if it is present.

Not verified: current permit details, fees and the Ohio EPA lab list; these were not opened. Rules vary by county health district.

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General information only. Not plumbing, legal or code advice. Confirm with a licensed professional and your local authority.