State laws governing radon in residential real estate transactions vary dramatically. Some states require sellers to disclose known radon test results (Florida, Illinois, New Jersey). Others fold radon into broader environmental hazard disclosure forms (California, Colorado). Some mandate that radon measurement professionals be certified or licensed; others have no licensing requirement. EPA recommends 4 pCi/L as the action level but this is not a legal standard — state action levels may differ. This table gives the disclosure requirement, testing mandate, professional certification requirement, action level, and statute citation for each state.

State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Alaska

**disclosure_required:** Yes; part of a general residential real property disclosure statement. Form requires disclosure of knowledge of environmental hazards including radon gas.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Alaska Statutes §§ 34.70.010--.200

> Alaska Statutes §§ 34.70.010--.200

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Alaska — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, professional_certification_required, school_testing_required, testing_mandated


**jurisdiction:** California

**disclosure_required:** Yes; part of a general environmental hazard disclosure form. Sellers of up to four residential units must disclose the presence of environmental hazards including radon gas.

**testing_mandated:** No

**professional_certification_required:** Yes; no person may provide radon services for the general public unless that person has completed the National Radon Measurement Proficiency Program of the National Environmental Health Association or the National Radon Safety Board Certified Radon Professional Program

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** California Civil Code §§ 1102--1102.18; California Health & Safety Code §§ 106750 et seq.

> Requires sellers of real property containing up to four residential units to complete a disclosure form indicating the presence of all environmental hazards, including radon gas, formaldehyde, and mold, that are known to the seller

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

California — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, jurisdiction, professional_certification_required, school_testing_required, statute_citation, testing_mandated


**jurisdiction:** Colorado

**disclosure_required:** Yes; sellers must provide buyers a state-developed radon pamphlet and disclose in writing any knowledge of radon concentrations, radon testing, or radon mitigation systems at the property. Landlords must also provide radon disclosure before lease signing.

**testing_mandated:** Yes; schools must test for radon in accordance with AARST protocols. Newly constructed schools must test within 19 months of occupancy. Child care facilities must test within six months of occupancy.

**professional_certification_required:** Yes; state license required for individuals performing radon mitigation or radon measurement

**action_level_pci_l:** 4 pCi/L

**school_testing_required:** Yes; schools must test for radon in accordance with 2015 AARST Protocols and maintain results on file. Child care facilities must also test.

**statute_citation:** Colorado Revised Statutes §§ 38-35.7-112, 38-12-803, 12-165-101--113, 25-1.5-101

> Requires sellers to provide buyers a state-developed radon pamphlet and to disclose in writing any knowledge of radon concentrations, radon testing, or radon mitigation systems at the property

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Colorado — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, jurisdiction, professional_certification_required, school_testing_required, statute_citation, testing_mandated


**jurisdiction:** Connecticut

**disclosure_required:** Yes; sellers of residential property containing four units or fewer must provide a written residential condition report indicating seller's knowledge of any radon testing results and presence of a radon control system.

**testing_mandated:** Yes; child day care centers and group day care homes using a basement or first-floor level must conduct at least one radon test during November through April.

**professional_certification_required:** Yes; Department of Public Health maintains a list of companies and individuals included in current lists of national radon proficiency programs. Radon mitigation contractors must have certification from NRSB or NEHA.

**action_level_pci_l:** 4.0 pCi/L

**school_testing_required:** Yes; boards of education must inspect and evaluate indoor air quality in schools annually, including radon levels. School building projects in areas of moderate or high radon potential must incorporate radon mitigation techniques.

**statute_citation:** Connecticut General Statutes §§ 20-327b, 19a-79, 19a-14b, 10-220, 10-291

> Regulations require radon mitigation by a service provider who meets state qualifications if radon levels are 4.0 pCi/L or greater. Connecticut

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Connecticut — State Residential Radon Disclosure, Testing, and Certification Requirements

disclosure_required, professional_certification_required, school_testing_required, statute_citation, testing_mandated


**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

> 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.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Delaware — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** District of Columbia

**disclosure_required:** Yes; sellers of property containing up to four dwelling units must provide a real property disclosure statement including information about radon, asbestos, lead-based paint, and formaldehyde.

**testing_mandated:** Yes; D.C. Dept. of General Services must assess D.C.-owned buildings including schools for radon and other IAQ risks.

**professional_certification_required:** Yes; persons conducting radon screening, testing, or mitigation for a fee must be certified by the National Radon Proficiency Program or the National Radon Safety Board.

**action_level_pci_l:** No D.C.-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; D.C.-owned buildings including schools must be assessed for radon.

**statute_citation:** District of Columbia Code §§ 42-1301--1311, 28-4201--4203, 10-712

> Requires sellers of property containing up to four dwelling units to provide to purchasers a real property disclosure statement on a form approved by the Mayor. Regulation adopting Seller's Disclosure Statement (17 D.C. Mun. Regs. 2708) requires information about sellers' knowledge of environmental problems on the property, including radon, asbestos, lead-based paint, and formaldehyde

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

District of Columbia — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Florida

**disclosure_required:** Yes; a specified radon warning statement must be provided prior to the sale or lease of residential real estate.

**testing_mandated:** Yes; radon testing required of all public and private schools, 24-hour care facilities owned or regulated by the state, and state-licensed day care centers in designated counties.

**professional_certification_required:** Yes; persons who perform radon measurement and mitigation must be certified by the Department of Health.

**action_level_pci_l:** 4.0 pCi/L

**school_testing_required:** Yes; all public and private schools in designated counties must be tested.

**statute_citation:** Florida Statutes § 404.056; Fla. Admin. Code r. 64E-5.1001, 64E-5.1201--1208

> (4.0 pCi/L) (Fla. Admin. Code. R. 64E-5.1001). Florida

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Florida — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Georgia

**disclosure_required:** No state radon disclosure requirement in real estate transactions

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** Georgia Code § 12-3-5

> Authorizes the Department of Natural Resources to make grants, as funds are available, to public entities in order to further any of the services, purposes, duties, responsibilities, or functions vested in the Department. Regulations promulgated under the law (Georgia Comp. R. & Regs. 391-7-2-.01--.04) established the Radon Awareness Grant Program to provide funds to local governments and community-based organizations to address radon issues in their communities.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Georgia — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, professional_certification_required, school_testing_required, statute_citation, testing_mandated


**jurisdiction:** Idaho

**disclosure_required:** No state radon disclosure requirement in real estate transactions

**testing_mandated:** Yes; children's residential care facilities must provide documentation of radon testing upon initial licensing.

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** Idaho Statutes § 39-1210

> Idaho Statutes § 39-1210

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Idaho — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Illinois

**disclosure_required:** Yes; sellers must disclose known elevated radon levels and provide buyers a state-developed pamphlet on radon testing and a general warning statement. Landlords must also disclose radon hazards to tenants.

**testing_mandated:** Yes; licensed day care centers and homes must test for radon at least once every three years. All new residential construction must include passive radon-resistant construction techniques.

**professional_certification_required:** Yes; state licensing required for persons selling radon detection devices, performing radon detection, or performing radon reduction services.

**action_level_pci_l:** State action level referenced but defers to EPA recommended 4 pCi/L

**school_testing_required:** Yes; recommends that occupied school buildings be tested every five years for radon, with reporting to the Board of Education.

**statute_citation:** Illinois Compiled Statutes Ch. 420, §§ 44/1--90, 46/1--25, 52/1 et seq.; Ch. 765, §§ 77/1--65; Ch. 225, § 10/5.8; Ch. 105, § 5/10-20.48

> Requires sellers to disclose known elevated radon levels in the home and to provide buyers a state- developed pamphlet on radon testing and a general warning statement recommending radon testing prior to all home purchases and mitigation of elevated levels.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Illinois — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Indiana

**disclosure_required:** Yes; sellers of property containing up to four dwelling units must complete a disclosure form disclosing knowledge of hazardous conditions including radon gas.

**testing_mandated:** No

**professional_certification_required:** Yes; state certification program required for persons engaged in radon testing and abatement.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Indiana Code §§ 32-21-5-1--12, 16-41-38-1--10

> Requires sellers of property containing up to four dwelling units to complete a Seller's Residential Real Estate Sales Disclosure form. Rules adopted under the law (876 Ind. Admin. Code 9-1-2) establish the disclosure form, which requires sellers to disclose knowledge of hazardous conditions on the property, including radon gas

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Indiana — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Iowa

**disclosure_required:** Yes; sellers must deliver a written disclosure statement indicating the condition of the property, including results of any radon tests. Buyer must acknowledge receipt of a state-issued radon fact sheet.

**testing_mandated:** Yes; child care centers at ground level or with basements must test for radon. Public school districts must test by July 1, 2027 and every five years thereafter.

**professional_certification_required:** Yes; Department of Public Health certifies persons who test for radon and credentials persons who perform radon abatement.

**action_level_pci_l:** 4.0 pCi/L

**school_testing_required:** Yes; public school districts must test for radon by July 1, 2027 and every five years thereafter, and publish results on the district website.

**statute_citation:** Iowa Code §§ 558A.1 et seq., 237A.12, 280.32, 136B.1--.5

> Requires sellers of residential real property to deliver to buyers prior to transfer a written disclosure statement indicating the condition and characteristics of the property. Regulations adopted under the law (Iowa Admin. Code 193E-14.1(543B)) incorporate the required disclosure items in a sample form, including disclosure of the results of any radon tests and the presence of lead-based paint or asbestos.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Iowa — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Kansas

**disclosure_required:** Yes; every contract for sale of residential real estate must contain a radon notice as specified in the law, including information about health effects and a recommendation for testing.

**testing_mandated:** No

**professional_certification_required:** Yes; Department of Health and Environment certifies persons performing radon testing or mitigation.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Kansas Statutes § 58-3078a; Kansas Statutes §§ 48-16a01 et seq.

> Requires every contract for the sale of residential real estate to contain a radon notice as specified in the law. Notice includes information about the health effects of radon and a recommendation for radon testing.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Kansas — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Kentucky

**disclosure_required:** Yes; Seller's Disclosure of Conditions form required in residential real estate transactions involving licensed agents, including disclosure of any radon testing and installed radon mitigation systems.

**testing_mandated:** No

**professional_certification_required:** Yes; registration certificate required from the state to conduct radon measurement, mitigation, or laboratory analysis, with proof of NRPP or NRSB compliance.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Kentucky Revised Statutes §§ 324.360, 309.430--.454

> Requires that a Seller's Disclosure of Conditions form be used in residential real estate transactions if licensed real estate agents are involved and receive compensation. Requires the real estate commission to promulgate an administrative regulation authorizing the form.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Kentucky — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Louisiana

**disclosure_required:** Yes; sellers must complete a property disclosure document, with the form requiring disclosure of whether the property contains radon.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** Louisiana Revised Statutes § 9:3198

> Requires sellers of residential real property to complete a property disclosure document containing at least the minimum language prescribed by the Louisiana Real Estate Commission. Form developed by the Commission requires disclosure of whether the property contains radon, mold/mildew, asbestos, formaldehyde, contaminated drywall, and contaminated flooring

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Louisiana — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, professional_certification_required, school_testing_required, statute_citation, testing_mandated


**jurisdiction:** Maine

**disclosure_required:** Yes; sellers must provide a disclosure statement regarding known defects and presence of hazardous materials including radon. Landlords must provide written radon notice to tenants including test results and mitigation information.

**testing_mandated:** Yes; residential landlords must have the air in their rental properties tested for radon, with re-testing every 10 years when requested by a tenant.

**professional_certification_required:** Yes; persons who test for or mitigate radon must register with the Department of Health and Human Services.

**action_level_pci_l:** 4.0 pCi/L

**school_testing_required:** Yes; school administrative units may test occupied schools every five years for radon. Newly-built schools must use radon-resistant construction techniques.

**statute_citation:** Maine Revised Statutes, tit. 33, § 173; tit. 14, § 6030-D; tit. 22, §§ 771--784; tit. 20-A, § 4013

> Maine Revised Statutes, tit. 22, § 785 ME Establishes the Maine Gold Standard for Radon Testing and Mitigation Initiative effective July 1, 2022, to recognize, promote and assist, landlords, homeowners and home builders who meet the radon testing and mitigation criteria set forth in the law. Criteria for landlords to receive the gold standard designation include radon testing every two years and mitigation of radon levels above 4.0 pCi/L, with the Department of Health and Human Services paying the first $600 in mitigation expenses.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Maine — State Residential Radon Disclosure, Testing, and Certification Requirements


**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

> 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>

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


**jurisdiction:** Massachusetts

**disclosure_required:** No standalone radon disclosure requirement; state requires an informational brochure for home buyers on home inspections including information regarding radon inspections.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Massachusetts General Laws, ch. 13, § 97; ch. 43, § 93

> Requires the state to publish an informational brochure for home buyers on home inspections, including information regarding radon inspections, and requires that the brochure be issued to home buyers at the signing of the first written contract to purchase.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Massachusetts — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Michigan

**disclosure_required:** Yes; sellers of residential property of up to four dwelling units must complete a seller's disclosure statement which provides for disclosure of radon gas and other environmental hazards.

**testing_mandated:** Yes; child care homes must be tested for radon before initial license and every four years thereafter at license renewal.

**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:** Michigan Compiled Laws §§ 565.951--.966, 722.112, 125.1504

> Requires sellers of residential property consisting of up to four dwelling units to complete a seller's disclosure statement, which provides for disclosure of any environmental hazards on the property, including radon gas, asbestos, formaldehyde, and lead-based paint.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Michigan — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Minnesota

**disclosure_required:** Yes; sellers must provide buyers with a copy of the Department of Health publication 'Radon in Real Estate Transactions' along with a written disclosure of radon test results, mitigation, and a radon warning.

**testing_mandated:** No mandatory residential testing requirement

**professional_certification_required:** Yes; those who perform radon testing, mitigation, and laboratory services for compensation must be licensed annually by the state.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No mandatory requirement; departments of health and education may develop a plan to encourage school districts to conduct radon testing.

**statute_citation:** Minnesota Statutes §§ 144.496, 144.4961, 326B.106, 123B.571

> Requires sellers to provide buyers with a copy of the Department of Health publication entitled "Radon in Real Estate Transactions," along with a written disclosure that includes: whether a radon test has occurred; the most recent records of radon concentrations in the dwelling; a description of any radon mitigation or remediation, including any installed mitigation system; and a radon warning

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Minnesota — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Montana

**disclosure_required:** Yes; sellers must provide a disclosure statement regarding adverse material facts including whether the property has been tested or treated for radon. Must also provide a general radon warning statement and disclosure of known radon test results.

**testing_mandated:** No mandatory residential testing requirement

**professional_certification_required:** Yes; radon professionals must pass a U.S. EPA proficiency examination to be publicly listed as proficient.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No mandatory requirement; school regulations recommend the use of radon prevention strategies in new construction.

**statute_citation:** Montana Code §§ 70-20-502, 75-3-601--607, 50-1-206

> Requires sellers of residential real property to provide purchasers a disclosure statement regarding any adverse material facts that concern the property and of which the seller has actual knowledge. The disclosure statement must include whether the property has been tested or treated for asbestos, radon, lead-based paint, or mold

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Montana — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Nebraska

**disclosure_required:** Yes; sellers must submit a written disclosure statement disclosing knowledge of radon gas on the property, any radon mitigation conducted, and copies of any radon tests.

**testing_mandated:** No mandatory residential testing requirement, but new construction intended to be regularly occupied must incorporate passive radon-resistant elements.

**professional_certification_required:** Yes; licensing required for radon measurement and mitigation specialists, technicians, and businesses.

**action_level_pci_l:** 2.7 pCi/L (threshold for counties where radon-resistant new construction is required)

**school_testing_required:** No

**statute_citation:** Nebraska Revised Statutes §§ 76-2,120, 71-3501, 76-3501--3507

> Requires sellers of residential real property to submit a written disclosure statement to buyers during real estate transactions. Regulations establishing the disclosure form (302 Neb. Admin. Code, Ch. 1, § 001) require the disclosure of sellers' knowledge of radon gas on the property and any radon mitigation that has been conducted, as well as the provision of copies of any radon tests that have been conducted on the property.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Nebraska — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** New Hampshire

**disclosure_required:** Yes; prior to executing a contract for sale, sellers must provide buyers a radon notification statement about radon gas and testing.

**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

> 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.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

New Hampshire — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** New Jersey

**disclosure_required:** Yes; sellers must provide buyers with copies of any radon test results upon entering into contract for sale. Disclosure form includes a voluntary section allowing sellers to provide radon testing results and mitigation information.

**testing_mandated:** Yes; child care centers must be tested for radon at least once every five years.

**professional_certification_required:** Yes; state certification required for persons testing for or mitigating radon for remuneration.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; radon hazard subcode requires radon-resistant new construction in certain school buildings in designated areas.

**statute_citation:** New Jersey Statutes §§ 26:2D-70--80, 30:5B-5.2, 52:27D-123A--123E, 56:8-19.1

> Requires sellers to provide buyers with copies of any radon test results upon entering into contract for sale. Regulations adopted under the law (N.J. Admin. Code 7:28-27.1 et seq.) establish the requirements and procedures for certification of radon testers and mitigators.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

New Jersey — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, jurisdiction, school_testing_required, statute_citation, testing_mandated


**jurisdiction:** New York

**disclosure_required:** Yes; sellers of residential real property must complete and provide a property condition disclosure statement, including disclosure of any radon testing performed on the property.

**testing_mandated:** Yes; child day care facilities in Zone 1 areas must complete radon testing before licensing.

**professional_certification_required:** Yes; radon testing and mitigation firms must report testing and mitigation results to the Department of Health. Radon Assessment Specialists must meet state requirements.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No mandatory school testing requirement, but child day care facilities in Zone 1 areas must test.

**statute_citation:** New York Real Property Law § 462; New York Public Health Law § 225; New York Social Services Law § 390

> Requires all sellers of residential real property to complete and provide to the buyer a property condition disclosure statement, which requires disclosure of the presence of hazardous substances, asbestos, and methane gas, and of any radon testing performed on the property.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

New York — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** North Carolina

**disclosure_required:** Yes; owners of residential real property of up to four units must provide buyers with a disclosure statement regarding environmental conditions including the presence of radon gas.

**testing_mandated:** No

**professional_certification_required:** No mandatory certification; state established a voluntary approval process for radon proficiency programs in 2023.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No mandatory requirement; legislature directed the State Board of Education to survey public schools to determine need for radon testing.

**statute_citation:** North Carolina General Statutes §§ 47E-1 et seq.; House Bill 782 (2023); House Bill 259 (S.L. 2023-134)

> Requires owners of residential real property consisting of up to four units to provide buyers with a disclosure statement regarding known environmental conditions of the property, including the presence of radon gas, lead-based paint, asbestos, methane gas, and other hazardous or toxic materials.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

North Carolina — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Ohio

**disclosure_required:** Yes; sellers of residential real property of up to four units must deliver a disclosure form disclosing the presence of hazardous materials including radon gas.

**testing_mandated:** No

**professional_certification_required:** Yes; state licensing required for persons providing professional radon testing and mitigation services.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Ohio Revised Code §§ 5302.30, 3723.01--.18, 3748.20

> Requires sellers of residential real property containing up to four units to deliver a disclosure form to buyers disclosing material defects and the presence of hazardous materials or substances, including radon gas.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Ohio — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Oklahoma

**disclosure_required:** Yes; sellers of residential property of 1-2 dwelling units must provide a Property Condition Disclosure Statement disclosing known presence of radon or any radon testing.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** Oklahoma Statutes, tit. 60, §§ 831--839

> Oklahoma Statutes, tit. 60, §§ 831--839

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Oklahoma — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Oregon

**disclosure_required:** Yes; sellers of real property of up to four dwelling units must provide a seller's property disclosure statement including disclosure of any testing or treatment for radon gas.

**testing_mandated:** Yes; school districts must develop a plan for radon testing in any frequently occupied room in contact with the ground, with retesting at least once every 10 years.

**professional_certification_required:** No state-specific licensing requirement for radon professionals

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; school districts must develop a radon testing plan for frequently occupied rooms and retest at least once every 10 years. Schools must adopt a Healthy and Safe Schools Plan addressing radon.

**statute_citation:** Oregon Revised Statutes §§ 105.462--.490, 332.341, .345, 332.331, .334, .337, 455.365

> Amends existing disclosure law to require sellers of real property consisting of up to four dwelling units to provide buyers with a seller's property disclosure statement, which includes disclosure of any testing of or treatment for formaldehyde, radon gas, mold, lead-based paint, or asbestos on the property.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Oregon — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Pennsylvania

**disclosure_required:** Yes; sellers must complete and deliver a Seller's Property Disclosure Statement disclosing knowledge of radon and other hazardous substances.

**testing_mandated:** No

**professional_certification_required:** Yes; state certification required for persons who test for, mitigate, or safeguard a building from radon.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Pennsylvania Statutes, tit. 68, §§ 7301 et seq.; tit. 63, §§ 2001 et seq.; tit. 35, §§ 7501--7504

> Requires sellers of residential real property to complete and deliver to buyers a Seller's Property Disclosure Statement. Requires the State Real Estate Commission to create the disclosure statement.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Pennsylvania — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Rhode Island

**disclosure_required:** Yes; sellers must provide buyers a disclosure form explaining all known deficient conditions including radon. Form must include a statement that radon exists in Rhode Island and testing is advisable.

**testing_mandated:** Yes; state directs establishment of regulations requiring evaluation of all public buildings, schools, and day care centers for elevated radon levels. Child care facilities must test every three years.

**professional_certification_required:** Yes; state certification or licensure required for radon professionals.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; regulations require testing and notification of high radon levels in public buildings, schools, and child care facilities.

**statute_citation:** Rhode Island General Laws §§ 5-20.8-1--8, 23-61-1 et seq., 16-60-4

> Requires sellers of residential real estate to provide buyers with a disclosure form explaining all known deficient conditions, including radon, mold, moisture damage, urea-formaldehyde foam insulation, asbestos, and hazardous contaminants.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Rhode Island — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** South Carolina

**disclosure_required:** Yes; sellers of property of up to four dwelling units must provide a written disclosure statement disclosing environmental contamination including radon gas.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** South Carolina Code §§ 27-50-10--110

> Requires sellers of property containing up to four dwelling units to provide purchasers with a written disclosure statement disclosing environmental contamination on the property, including the presence of radon gas, mold, lead-based paint, asbestos, methane gas, hazardous or toxic materials, and other environmental contamination.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

South Carolina — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** South Dakota

**disclosure_required:** Yes; sellers must provide a property disclosure form addressing known hazardous conditions including radon and any known testing.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** South Dakota Codified Laws §§ 43-4-37--44

> Requires sellers of residential property to provide a property disclosure form that addresses known hazardous conditions including radon, mold, methane gas, lead paint, asbestos insulation, urea formaldehyde foam insulation, and toxic materials, as well as any known testing for such conditions.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

South Dakota — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Tennessee

**disclosure_required:** Yes; sellers of residential real property of 1-4 dwelling units must provide a disclosure form disclosing knowledge of environmental hazards including radon gas.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No mandatory requirement; encourages local education agencies to implement IAQ inspection programs that may address radon.

**statute_citation:** Tennessee Code §§ 66-5-201 et seq., 49-2-121

> Requires sellers of residential real property containing 1-4 dwelling units to provide purchasers with a residential property disclaimer statement or a disclosure form that discloses knowledge of any environmental hazards on the property, including radon gas, asbestos, and lead-based paint.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Tennessee — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Texas

**disclosure_required:** Yes; sellers of single-unit residential property must give buyers a written disclosure notice addressing the presence of radon.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level

**school_testing_required:** No

**statute_citation:** Texas Property Code § 5.008; Texas Government Code §§ 2306.053, 2306.201 et seq.

> Requires that certain sellers of single-unit residential property give buyers a written disclosure notice that addresses a variety of conditions, including water damage and the presence of radon, asbestos, urea-formaldehyde insulation, lead-based paint, or hazardous or toxic waste.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Texas — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Utah

**disclosure_required:** No standalone radon disclosure requirement in real estate transactions; state requires radiation control agency to provide radon information with property tax notices.

**testing_mandated:** No

**professional_certification_required:** Yes; those installing or repairing radon mitigation systems must be licensed as a contractor under state construction trades licensing law.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Utah Code §§ 19-3-114, 58-55-305, 26B-7-116, 15A-3-206, 79-2-405

> Requires the state radiation control agency to provide each county treasurer, for inclusion with the mailing of property tax notices, information about radon risks, the presence of radon in Utah, the availability of radon test kits and professional testing, and possible mitigation resources.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Utah — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** Vermont

**disclosure_required:** No state radon disclosure requirement in real estate transactions

**testing_mandated:** Yes; public schools and approved independent schools must perform radon measurement by June 30, 2025 for any facility not tested in five or more years.

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; public and approved independent schools must perform radon measurement in accordance with ANSI/AARST protocols.

**statute_citation:** Vermont H. 426, Act 72 (2021)

> Requires that on or before June 30, 2025, each public school and approved independent school perform a radon measurement in accordance with ANSI/AARST protocols, for any school facility that has not had a test completed in five or more years.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Vermont — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, jurisdiction, professional_certification_required, statute_citation


**jurisdiction:** Virginia

**disclosure_required:** Yes; owners must disclose certain information to prospective purchasers using a state-developed form, including statements about radon zone location and advising purchasers to exercise due diligence regarding radon.

**testing_mandated:** Yes; every school building must be tested for radon pursuant to EPA procedures.

**professional_certification_required:** Yes; radon screening, testing, or mitigation professionals must meet proficiency measures acceptable to the Board of Health or EPA, or obtain NRPP or NRSB certification.

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** Yes; every school building in Virginia must be tested for radon pursuant to EPA procedures and regulations.

**statute_citation:** Virginia Code §§ 55.1-703, 22.1-138, 32.1-229, 32.1-229.01, 36-98

> Requires that every school building in Virginia be tested for radon pursuant to EPA procedures and regulations as prescribed by the Board of Education and that each school maintain files of its radon test results and make the files available for review.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Virginia — State Residential Radon Disclosure, Testing, and Certification Requirements

action_level_pci_l, disclosure_required, professional_certification_required, statute_citation


**jurisdiction:** Washington

**disclosure_required:** Yes; sellers of improved and unimproved residential and commercial real property must provide a disclosure statement indicating knowledge of radon gas and other substances of environmental concern.

**testing_mandated:** No

**professional_certification_required:** No state-specific requirement

**action_level_pci_l:** No state-specific action level; follows EPA recommended 4 pCi/L

**school_testing_required:** No

**statute_citation:** Washington Revised Code §§ 64.06.005--.070, 19.27.074

> Requires sellers of improved and unimproved residential real property, as well as commercial real estate, to provide buyers with a disclosure statement providing information about carbon monoxide alarms and indicating knowledge of substances of environmental concern on the property, including radon gas, formaldehyde, asbestos, and lead-based paint.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Washington — State Residential Radon Disclosure, Testing, and Certification Requirements


**jurisdiction:** West Virginia

**disclosure_required:** No state radon disclosure requirement in real estate transactions

**testing_mandated:** Yes; Division of Health must perform radon testing in new schools within one year of occupancy and at least once every five years thereafter.

**professional_certification_required:** Yes; state licensing required for radon testers, mitigators, and laboratories.

**action_level_pci_l:** No state-specific action level; state must establish standards for safe levels of radon in public school buildings.

**school_testing_required:** Yes; radon testing in new schools within one year of occupancy and at least once every five years thereafter.

**statute_citation:** West Virginia Code §§ 18-9E-3, 16-34-1 et seq.

> Requires the Division of Health to perform radon testing in new schools within one year of occupancy and at least once every five years thereafter. Requires the state to establish standards for safe levels of radon in public school buildings and requires mitigation if testing reveals high radon levels.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

West Virginia — State Residential Radon Disclosure, Testing, and Certification Requirements

disclosure_required, jurisdiction, professional_certification_required, statute_citation


**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.

**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

> 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.

Source: <https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf>

Wisconsin — State Residential Radon Disclosure, Testing, and Certification Requirements