Delaware
What is the testing mandated for Delaware?
For Delaware, testing mandated is Yes; child care centers and homes must present evidence that the facility is free of radon hazards prior to licensing, with testing once every five years; 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; statute citation is Delaware Code, tit. 6, §§ 2570--2578; Delaware Code, tit. 14, § 3003a, recorded from its source on 2026-08-15; source re-checked 2026-10-01.
Requires sellers of property containing up to four residential dwelling units to disclose to the buyer, agent and/or subagent all known material defects of the property, including information about radon tests or inspections. Sellers must also provide purchasers with written information about radon developed by the state.
— eli.org, retrieved 2026-08-15
- jurisdiction
- Delaware
- disclosure required
- Yes; sellers of property containing up to four residential dwelling units must disclose information about radon tests or inspections. Sellers must also provide purchasers with written information about radon developed by the state.
- testing mandated
- Yes; child care centers and homes must present evidence that the facility is free of radon hazards prior to licensing, with testing once every five years.
- 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
- Delaware Code, tit. 6, §§ 2570--2578; Delaware Code, tit. 14, § 3003a
Source
- eli.orghttps://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf