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

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.

## 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/).