# Ohio — State Residential Radon Disclosure, Testing, and Certification Requirements

For Ohio, disclosure required is Yes; sellers of residential real property of up to four units must deliver a disclosure form disclosing the presence of hazardous materials including radon gas; testing mandated is No; professional certification required is Yes; state licensing required for persons providing professional radon testing and mitigation services; action level pci l is No state-specific action level; follows EPA recommended 4 pCi/L; school testing required is No, recorded from its source on 2026-08-15.

- **jurisdiction:** Ohio
- **disclosure required:** Yes; sellers of residential real property of up to four units must deliver a disclosure form disclosing the presence of hazardous materials including radon gas. _(verified: appears in the quote below)_
- **testing mandated:** No
- **professional certification required:** Yes; state licensing required for persons providing professional radon testing and mitigation services.
- **action level pci l:** No state-specific action level; follows EPA recommended 4 pCi/L
- **school testing required:** No
- **statute citation:** Ohio Revised Code §§ 5302.30, 3723.01--.18, 3748.20

## What the source says

> Requires sellers of residential real property containing up to four units to deliver a disclosure form to buyers disclosing material defects and the presence of hazardous materials or substances, including radon gas.

## Source

- https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf

Last verified: 2026-08-15. Review by: 2027-08-15.
Part of [State Residential Radon Disclosure, Testing, and Certification Requirements](https://referencesource.org/state-radon-disclosure-requirements/).