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

For Oregon, disclosure required is Yes; sellers of real property of up to four dwelling units must provide a seller's property disclosure statement including disclosure of any testing or treatment for radon gas; testing mandated is Yes; school districts must develop a plan for radon testing in any frequently occupied room in contact with the ground, with retesting at least once every 10 years; professional certification required is No state-specific licensing requirement for radon professionals; action level pci l is No state-specific action level; follows EPA recommended 4 pCi/L; school testing required is Yes; school districts must develop a radon testing plan for frequently occupied rooms and retest at least once every 10 years. Schools must adopt a Healthy and Safe Schools Plan addressing radon, recorded from its source on 2026-08-15.

- **jurisdiction:** Oregon
- **disclosure required:** Yes; sellers of real property of up to four dwelling units must provide a seller's property disclosure statement including disclosure of any testing or treatment for radon gas. _(verified: appears in the quote below)_
- **testing mandated:** Yes; school districts must develop a plan for radon testing in any frequently occupied room in contact with the ground, with retesting at least once every 10 years.
- **professional certification required:** No state-specific licensing requirement for radon professionals
- **action level pci l:** No state-specific action level; follows EPA recommended 4 pCi/L
- **school testing required:** Yes; school districts must develop a radon testing plan for frequently occupied rooms and retest at least once every 10 years. Schools must adopt a Healthy and Safe Schools Plan addressing radon.
- **statute citation:** Oregon Revised Statutes §§ 105.462--.490, 332.341, .345, 332.331, .334, .337, 455.365

## What the source says

> Amends existing disclosure law to require sellers of real property consisting of up to four dwelling units to provide buyers with a seller's property disclosure statement, which includes disclosure of any testing of or treatment for formaldehyde, radon gas, mold, lead-based paint, or asbestos on the property.

## 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/).