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

For Wisconsin, disclosure required is Yes; sellers of property of up to four dwelling units must provide buyers with a residential real estate condition disclosure report including the existence of radon; testing mandated is Yes; family and group child care centers must be tested for radon gas levels in the lowest level used by children; professional certification required is No state-specific licensing requirement for radon professionals; action level pci l is 4.0 pCi/L; school testing required is No, recorded from its source on 2026-08-15.

- **jurisdiction:** Wisconsin
- **disclosure required:** Yes; sellers of property of up to four dwelling units must provide buyers with a residential real estate condition disclosure report including the existence of radon. _(verified: appears in the quote below)_
- **testing mandated:** Yes; family and group child care centers must be tested for radon gas levels in the lowest level used by children.
- **professional certification required:** No state-specific licensing requirement for radon professionals
- **action level pci l:** 4.0 pCi/L
- **school testing required:** No
- **statute citation:** Wisconsin Statutes §§ 709.001 et seq., 48.67, 254.34

## What the source says

> Requires sellers of property containing up to four dwelling units to provide buyers with a residential real estate condition disclosure report, including the existence of potentially hazardous substances, including radon, lead-based paint, or asbestos.

## 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/).