action_level_pci_l string | disclosure_required string | id string | jurisdiction string | professional_certification_required string | school_testing_required string | source string | source_quote string | statute_citation string | testing_mandated string | url string | verified_fields list |
|---|---|---|---|---|---|---|---|---|---|---|---|
No state-specific action level; follows EPA recommended 4 pCi/L | Yes; part of a general residential real property disclosure statement. Form requires disclosure of knowledge of environmental hazards including radon gas. | alaska | Alaska | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | Alaska Statutes §§ 34.70.010--.200 AK Requires transferors of an interest in residential real property to provide to transferees a written disclosure statement prior to a written offer of transfer, and directs the Alaska Real Estate Commission to establish the form. Form developed by the Commission requires disclosure ... | Alaska Statutes §§ 34.70.010--.200 | No | https://referencesource.org/state-radon-disclosure-requirements/alaska/ | [
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No state-specific action level; follows EPA recommended 4 pCi/L | 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. | california | California | 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 | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 | California Civil Code §§ 1102--1102.18; California Health & Safety Code §§ 106750 et seq. | No | https://referencesource.org/state-radon-disclosure-requirements/california/ | null |
4 pCi/L | 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. | colorado | Colorado | Yes; state license required for individuals performing radon mitigation or radon measurement | Yes; schools must test for radon in accordance with 2015 AARST Protocols and maintain results on file. Child care facilities must also test. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 | Colorado Revised Statutes §§ 38-35.7-112, 38-12-803, 12-165-101--113, 25-1.5-101 | 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. | https://referencesource.org/state-radon-disclosure-requirements/colorado/ | null |
4.0 pCi/L | 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. | connecticut | Connecticut | 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. | 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. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | Regulations require radon mitigation by a service provider who meets state qualifications if radon levels are 4.0 pCi/L or greater. Connecticut | Connecticut General Statutes §§ 20-327b, 19a-79, 19a-14b, 10-220, 10-291 | 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. | https://referencesource.org/state-radon-disclosure-requirements/connecticut/ | [
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4.0 pCi/L | 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. | delaware | Delaware | No state-specific licensing requirement for radon professionals | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 sta... | Delaware Code, tit. 6, §§ 2570--2578; Delaware Code, tit. 14, § 3003a | 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. | https://referencesource.org/state-radon-disclosure-requirements/delaware/ | null |
No D.C.-specific action level; follows EPA recommended 4 pCi/L | 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. | district-of-columbia | District of Columbia | 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. | Yes; D.C.-owned buildings including schools must be assessed for radon. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 prop... | District of Columbia Code §§ 42-1301--1311, 28-4201--4203, 10-712 | Yes; D.C. Dept. of General Services must assess D.C.-owned buildings including schools for radon and other IAQ risks. | https://referencesource.org/state-radon-disclosure-requirements/district-of-columbia/ | null |
4.0 pCi/L | Yes; a specified radon warning statement must be provided prior to the sale or lease of residential real estate. | florida | Florida | Yes; persons who perform radon measurement and mitigation must be certified by the Department of Health. | Yes; all public and private schools in designated counties must be tested. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | Florida Statutes § 404.056 FL Authorizes the Department of Health to establish environmental radiation standards for buildings and to conduct programs designed to reduce human exposure to harmful environmental radiation. Requires persons who perform radon measurement and mitigation to be certified by the department and... | Florida Statutes § 404.056; Fla. Admin. Code r. 64E-5.1001, 64E-5.1201--1208 | 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. | https://referencesource.org/state-radon-disclosure-requirements/florida/ | [
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No state-specific action level | No state radon disclosure requirement in real estate transactions | georgia | Georgia | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 ... | Georgia Code § 12-3-5 | No | https://referencesource.org/state-radon-disclosure-requirements/georgia/ | [
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No state-specific action level | No state radon disclosure requirement in real estate transactions | idaho | Idaho | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | Idaho Statutes § 39-1210 ID Requires the Board of Health and Welfare to promulgate appropriate rules to implement and enforce standards for licensing children's residential care facilities, including standards that assure the safety and physical care of children. Regulations promulgated under the law (Idaho Admin. Code... | Idaho Statutes § 39-1210 | Yes; children's residential care facilities must provide documentation of radon testing upon initial licensing. | https://referencesource.org/state-radon-disclosure-requirements/idaho/ | [
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State action level referenced but defers to EPA recommended 4 pCi/L | 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. | illinois | Illinois | Yes; state licensing required for persons selling radon detection devices, performing radon detection, or performing radon reduction services. | Yes; recommends that occupied school buildings be tested every five years for radon, with reporting to the Board of Education. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | 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 | 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. | https://referencesource.org/state-radon-disclosure-requirements/illinois/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | Yes; sellers of property containing up to four dwelling units must complete a disclosure form disclosing knowledge of hazardous conditions including radon gas. | indiana | Indiana | Yes; state certification program required for persons engaged in radon testing and abatement. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 ... | Indiana Code §§ 32-21-5-1--12, 16-41-38-1--10 | No | https://referencesource.org/state-radon-disclosure-requirements/indiana/ | null |
4.0 pCi/L | 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. | iowa | Iowa | Yes; Department of Public Health certifies persons who test for radon and credentials persons who perform radon abatement. | Yes; public school districts must test for radon by July 1, 2027 and every five years thereafter, and publish results on the district website. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 dis... | Iowa Code §§ 558A.1 et seq., 237A.12, 280.32, 136B.1--.5 | 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. | https://referencesource.org/state-radon-disclosure-requirements/iowa/ | [
"jurisdiction"
] |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | kansas | Kansas | Yes; Department of Health and Environment certifies persons performing radon testing or mitigation. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Kansas Statutes § 58-3078a; Kansas Statutes §§ 48-16a01 et seq. | No | https://referencesource.org/state-radon-disclosure-requirements/kansas/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | kentucky | Kentucky | Yes; registration certificate required from the state to conduct radon measurement, mitigation, or laboratory analysis, with proof of NRPP or NRSB compliance. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Kentucky Revised Statutes §§ 324.360, 309.430--.454 | No | https://referencesource.org/state-radon-disclosure-requirements/kentucky/ | null |
No state-specific action level | Yes; sellers must complete a property disclosure document, with the form requiring disclosure of whether the property contains radon. | louisiana | Louisiana | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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, contamin... | Louisiana Revised Statutes § 9:3198 | No | https://referencesource.org/state-radon-disclosure-requirements/louisiana/ | [
"jurisdiction"
] |
4.0 pCi/L | 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. | maine | Maine | Yes; persons who test for or mitigate radon must register with the Department of Health and Human Services. | Yes; school administrative units may test occupied schools every five years for radon. Newly-built schools must use radon-resistant construction techniques. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 r... | Maine Revised Statutes, tit. 33, § 173; tit. 14, § 6030-D; tit. 22, §§ 771--784; tit. 20-A, § 4013 | 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. | https://referencesource.org/state-radon-disclosure-requirements/maine/ | [
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No state-specific action level; follows EPA recommended 4 pCi/L | 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. | maryland | Maryland | Yes; those engaging in the business of radon testing must complete certification by EPA's National Radon Measurement Proficiency Program. | No explicit school testing requirement, but building code incorporates IRC Appendix F radon-resistant construction for Zone 1 counties. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Maryland Real Property Code § 10-702; Maryland Environment Code § 8-305; Maryland Public Safety Code §§ 12-503--504 | Yes; residential child care programs must maintain evidence that buildings have been tested for and found to be free of hazards from radon. | https://referencesource.org/state-radon-disclosure-requirements/maryland/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | No standalone radon disclosure requirement; state requires an informational brochure for home buyers on home inspections including information regarding radon inspections. | massachusetts | Massachusetts | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Massachusetts General Laws, ch. 13, § 97; ch. 43, § 93 | No | https://referencesource.org/state-radon-disclosure-requirements/massachusetts/ | null |
4.0 pCi/L | 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. | michigan | Michigan | No state-specific licensing requirement for radon professionals | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Michigan Compiled Laws §§ 565.951--.966, 722.112, 125.1504 | Yes; child care homes must be tested for radon before initial license and every four years thereafter at license renewal. | https://referencesource.org/state-radon-disclosure-requirements/michigan/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | minnesota | Minnesota | Yes; those who perform radon testing, mitigation, and laboratory services for compensation must be licensed annually by the state. | No mandatory requirement; departments of health and education may develop a plan to encourage school districts to conduct radon testing. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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... | Minnesota Statutes §§ 144.496, 144.4961, 326B.106, 123B.571 | No mandatory residential testing requirement | https://referencesource.org/state-radon-disclosure-requirements/minnesota/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | montana | Montana | Yes; radon professionals must pass a U.S. EPA proficiency examination to be publicly listed as proficient. | No mandatory requirement; school regulations recommend the use of radon prevention strategies in new construction. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 pa... | Montana Code §§ 70-20-502, 75-3-601--607, 50-1-206 | No mandatory residential testing requirement | https://referencesource.org/state-radon-disclosure-requirements/montana/ | null |
2.7 pCi/L (threshold for counties where radon-resistant new construction is 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. | nebraska | Nebraska | Yes; licensing required for radon measurement and mitigation specialists, technicians, and businesses. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 ... | Nebraska Revised Statutes §§ 76-2,120, 71-3501, 76-3501--3507 | No mandatory residential testing requirement, but new construction intended to be regularly occupied must incorporate passive radon-resistant elements. | https://referencesource.org/state-radon-disclosure-requirements/nebraska/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | Yes; prior to executing a contract for sale, sellers must provide buyers a radon notification statement about radon gas and testing. | new-hampshire | New Hampshire | Yes; those who design or install radon mitigation systems must be certified with the National Radon Proficiency Program or the National Radon Safety Board. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 ... | New Hampshire Revised Statutes §§ 477:4-a, 310-A:189-a, 125:9 | No | https://referencesource.org/state-radon-disclosure-requirements/new-hampshire/ | [
"jurisdiction"
] |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | new-jersey | New Jersey | Yes; state certification required for persons testing for or mitigating radon for remuneration. | Yes; radon hazard subcode requires radon-resistant new construction in certain school buildings in designated areas. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | New Jersey Statutes §§ 26:2D-70--80, 30:5B-5.2, 52:27D-123A--123E, 56:8-19.1 | Yes; child care centers must be tested for radon at least once every five years. | https://referencesource.org/state-radon-disclosure-requirements/new-jersey/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | new-york | New York | Yes; radon testing and mitigation firms must report testing and mitigation results to the Department of Health. Radon Assessment Specialists must meet state requirements. | No mandatory school testing requirement, but child day care facilities in Zone 1 areas must test. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | New York Real Property Law § 462; New York Public Health Law § 225; New York Social Services Law § 390 | Yes; child day care facilities in Zone 1 areas must complete radon testing before licensing. | https://referencesource.org/state-radon-disclosure-requirements/new-york/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | north-carolina | North Carolina | No mandatory certification; state established a voluntary approval process for radon proficiency programs in 2023. | No mandatory requirement; legislature directed the State Board of Education to survey public schools to determine need for radon testing. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | North Carolina General Statutes §§ 47E-1 et seq.; House Bill 782 (2023); House Bill 259 (S.L. 2023-134) | No | https://referencesource.org/state-radon-disclosure-requirements/north-carolina/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | ohio | Ohio | Yes; state licensing required for persons providing professional radon testing and mitigation services. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Ohio Revised Code §§ 5302.30, 3723.01--.18, 3748.20 | No | https://referencesource.org/state-radon-disclosure-requirements/ohio/ | null |
No state-specific action level | 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. | oklahoma | Oklahoma | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | Oklahoma Statutes, tit. 60, §§ 831--839 OK Requires sellers of residential property consisting of 1-2 dwelling units to provide to purchasers either a written property disclaimer statement or written Property Condition Disclosure Statement. Requires the Oklahoma Real Estate Commission to establish by rule a form for th... | Oklahoma Statutes, tit. 60, §§ 831--839 | No | https://referencesource.org/state-radon-disclosure-requirements/oklahoma/ | [
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No state-specific action level; follows EPA recommended 4 pCi/L | 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. | oregon | Oregon | No state-specific licensing requirement for radon professionals | 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. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Oregon Revised Statutes §§ 105.462--.490, 332.341, .345, 332.331, .334, .337, 455.365 | 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. | https://referencesource.org/state-radon-disclosure-requirements/oregon/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | Yes; sellers must complete and deliver a Seller's Property Disclosure Statement disclosing knowledge of radon and other hazardous substances. | pennsylvania | Pennsylvania | Yes; state certification required for persons who test for, mitigate, or safeguard a building from radon. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Pennsylvania Statutes, tit. 68, §§ 7301 et seq.; tit. 63, §§ 2001 et seq.; tit. 35, §§ 7501--7504 | No | https://referencesource.org/state-radon-disclosure-requirements/pennsylvania/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | rhode-island | Rhode Island | Yes; state certification or licensure required for radon professionals. | Yes; regulations require testing and notification of high radon levels in public buildings, schools, and child care facilities. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Rhode Island General Laws §§ 5-20.8-1--8, 23-61-1 et seq., 16-60-4 | 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. | https://referencesource.org/state-radon-disclosure-requirements/rhode-island/ | null |
No state-specific action level | Yes; sellers of property of up to four dwelling units must provide a written disclosure statement disclosing environmental contamination including radon gas. | south-carolina | South Carolina | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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 co... | South Carolina Code §§ 27-50-10--110 | No | https://referencesource.org/state-radon-disclosure-requirements/south-carolina/ | null |
No state-specific action level | Yes; sellers must provide a property disclosure form addressing known hazardous conditions including radon and any known testing. | south-dakota | South Dakota | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | South Dakota Codified Laws §§ 43-4-37--44 | No | https://referencesource.org/state-radon-disclosure-requirements/south-dakota/ | null |
No state-specific action level | Yes; sellers of residential real property of 1-4 dwelling units must provide a disclosure form disclosing knowledge of environmental hazards including radon gas. | tennessee | Tennessee | No state-specific requirement | No mandatory requirement; encourages local education agencies to implement IAQ inspection programs that may address radon. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Tennessee Code §§ 66-5-201 et seq., 49-2-121 | No | https://referencesource.org/state-radon-disclosure-requirements/tennessee/ | null |
No state-specific action level | Yes; sellers of single-unit residential property must give buyers a written disclosure notice addressing the presence of radon. | texas | Texas | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Texas Property Code § 5.008; Texas Government Code §§ 2306.053, 2306.201 et seq. | No | https://referencesource.org/state-radon-disclosure-requirements/texas/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | No standalone radon disclosure requirement in real estate transactions; state requires radiation control agency to provide radon information with property tax notices. | utah | Utah | Yes; those installing or repairing radon mitigation systems must be licensed as a contractor under state construction trades licensing law. | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Utah Code §§ 19-3-114, 58-55-305, 26B-7-116, 15A-3-206, 79-2-405 | No | https://referencesource.org/state-radon-disclosure-requirements/utah/ | [
"jurisdiction"
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No state-specific action level; follows EPA recommended 4 pCi/L | No state radon disclosure requirement in real estate transactions | vermont | Vermont | No state-specific requirement | Yes; public and approved independent schools must perform radon measurement in accordance with ANSI/AARST protocols. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Vermont H. 426, Act 72 (2021) | 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. | https://referencesource.org/state-radon-disclosure-requirements/vermont/ | null |
No state-specific action level; follows EPA recommended 4 pCi/L | 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. | virginia | Virginia | 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. | Yes; every school building in Virginia must be tested for radon pursuant to EPA procedures and regulations. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Virginia Code §§ 55.1-703, 22.1-138, 32.1-229, 32.1-229.01, 36-98 | Yes; every school building must be tested for radon pursuant to EPA procedures. | https://referencesource.org/state-radon-disclosure-requirements/virginia/ | [
"jurisdiction"
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No state-specific action level; follows EPA recommended 4 pCi/L | 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. | washington | Washington | No state-specific requirement | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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, a... | Washington Revised Code §§ 64.06.005--.070, 19.27.074 | No | https://referencesource.org/state-radon-disclosure-requirements/washington/ | null |
No state-specific action level; state must establish standards for safe levels of radon in public school buildings. | No state radon disclosure requirement in real estate transactions | west-virginia | West Virginia | Yes; state licensing required for radon testers, mitigators, and laboratories. | Yes; radon testing in new schools within one year of occupancy and at least once every five years thereafter. | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | West Virginia Code §§ 18-9E-3, 16-34-1 et seq. | Yes; Division of Health must perform radon testing in new schools within one year of occupancy and at least once every five years thereafter. | https://referencesource.org/state-radon-disclosure-requirements/west-virginia/ | null |
4.0 pCi/L | 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. | wisconsin | Wisconsin | No state-specific licensing requirement for radon professionals | No | https://www.eli.org/sites/default/files/files-pdf/2025%20Radon.pdf | 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. | Wisconsin Statutes §§ 709.001 et seq., 48.67, 254.34 | Yes; family and group child care centers must be tested for radon gas levels in the lowest level used by children. | https://referencesource.org/state-radon-disclosure-requirements/wisconsin/ | null |
State Residential Radon Disclosure, Testing, and Certification Requirements
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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.
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