Maryland
For Maryland, disclosure required is Yes; sellers must provide buyers with a disclaimer or disclosure form including actual knowledge of radon and other hazardous materials. Home builders must also disclose environmental hazards including radon; testing mandated is Yes; residential child care programs must maintain evidence that buildings have been tested for and found to be free of hazards from radon; professional certification required is Yes; those engaging in the business of radon testing must complete certification by EPA's National Radon Measurement Proficiency Program; action level pci l is No state-specific action level; follows EPA recommended 4 pCi/L; school testing required is No explicit school testing requirement, but building code incorporates IRC Appendix F radon-resistant construction for Zone 1 counties, recorded from its source on 2026-08-15.
- jurisdiction
- Maryland
- disclosure required
- Yes; sellers must provide buyers with a disclaimer or disclosure form including actual knowledge of radon and other hazardous materials. Home builders must also disclose environmental hazards including radon.
- testing mandated
- Yes; residential child care programs must maintain evidence that buildings have been tested for and found to be free of hazards from radon.
- professional certification required
- Yes; those engaging in the business of radon testing must complete certification by EPA's National Radon Measurement Proficiency Program.
- action level pci l
- No state-specific action level; follows EPA recommended 4 pCi/L
- school testing required
- No explicit school testing requirement, but building code incorporates IRC Appendix F radon-resistant construction for Zone 1 counties.
- statute citation
- Maryland Real Property Code § 10-702; Maryland Environment Code § 8-305; Maryland Public Safety Code §§ 12-503--504
What the source says
Requires that sellers of residential properties with four or fewer single-family units provide buyers with a disclaimer or disclosure form. Disclaimer includes any known latent defects that would pose a direct threat to health or safety, and that would not be apparent by a careful visual inspection.
— eli.org, retrieved 2026-08-15
Source
- eli.orghttps://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf