New Hampshire
For New Hampshire, disclosure required is Yes; prior to executing a contract for sale, sellers must provide buyers a radon notification statement about radon gas and testing; testing mandated is No; professional certification required is Yes; those who design or install radon mitigation systems must be certified with the National Radon Proficiency Program or the National Radon Safety Board; action level pci l is No state-specific action level; follows EPA recommended 4 pCi/L; school testing required is No, recorded from its source on 2026-08-15.
- jurisdiction
- New Hampshire verified
- disclosure required
- Yes; prior to executing a contract for sale, sellers must provide buyers a radon notification statement about radon gas and testing. verified
- testing mandated
- No
- professional certification required
- Yes; those who design or install radon mitigation systems must be certified with the National Radon Proficiency Program or the National Radon Safety Board.
- action level pci l
- No state-specific action level; follows EPA recommended 4 pCi/L
- school testing required
- No
- statute citation
- New Hampshire Revised Statutes §§ 477:4-a, 310-A:189-a, 125:9
What the source says
Requires that prior to executing a contract for the sale of real property, the seller must provide to buyer the following radon notification statement: "Radon gas, the product of decay of radioactive materials in rock may be found in some areas of New Hampshire. This gas may pass into a structure through the ground or through water from a deep well.
— eli.org, retrieved 2026-08-15
Source
- eli.orghttps://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf