Wisconsin
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
- 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.
— eli.org, retrieved 2026-08-15
Source
- eli.orghttps://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf