Radon is a cancer-causing natural radioactive gas that you can’t see, smell or taste. Its presence in our home can pose a danger to your family's health. Radon is the leading cause of lung cancer among non-smokers, and the second leading cause of lung cancer in America, claiming about 20,000 lives annually. 

Radon gas comes from the natural (radioactive) breakdown of uranium in soil, rock and water.  It is found in every part of the U.S., and can get into any type of building - homes, offices, and schools - and result in a high indoor radon level. The greatest exposure occurs at home, where most people spend most of their time.

Radon bottleRadon Legislation and Statutes

States have taken action to address the threat of radon to their constituents. Click the following links to see the legislation lawmakers have passed to actively address the concerns of radon in their states.

Radon Map

Radon is present everywhere in the United States. Levels of the gas differ from state to state, but it is particularly high in North Dakota and Iowa. The U.S. Environmental Protection Agency’s Map of Radon Zones shows the potential for elevated radon levels for each county in the United States.

Additional NCSL Radon Resources

Radon Resources

Note: NCSL provides links to other websites from time to time for information purposes only.  Providing these links does not necessarily indicate NCSL's support or endorsement of the site.

State Radon Statutes Chart
State Statute Citation Statute Summary
Alabama No Code  
Arizona Ariz. Rev. Stat. § 27-371 Radon Control. Concentrations of radon gas shall not exceed such amounts as may be set by the inspector.
  Ariz. Rev. Stat. § 27-372 Uranium operations; testing for radon daughters. In all uranium operations the operator shall test regularly for radon daughter concentration and submit such records of testing as may be required to the inspector.
  Ariz. Rev. Stat. § 33-423 Radon Disclosure. A disclosure report pursuant to this section may be provided to the buyer or seller of real property by a third party as authorized by the buyer or seller, including information on radon gas potential zones as shown on current maps issued by the United States environmental protection agency
Arkansas No Code  
Alaska No Code  
California Cal.Health & Safety Code § 105430 Radon levels in new buildings; assessment and mitigation plans; building permits; cost-effective controls; operative effect of section
  Cal.Health & Safety Code § 106750 Establishment of certification requirements
  Cal.Health & Safety Code § 106775 Radon services
  Cal.Health & Safety Code § 106780 Performance of radon services; prerequisites
  Cal.Health & Safety Code § 106790 Exemptions.
  Cal.Health & Safety Code  § 106795 Violations; Penalty. It is unlawful for an individual to provide radon services in violation of this article
  Cal.Health & Safety Code § 25417.1 The department shall publish a new edition of the consumer information booklet 
  Cal.Bus. & Prof.Code § 10084.1  Consumer education booklet, environmental hazards; development and contents
Colorado  Colo. Rev. Stat. § 25-7-109.3 Colorado hazardous air pollutant control and reduction program. Includes Radon decay products.
  Colo. Rev. Stat. § 6-1-105 Deceptive Trade Practice. A person engages in a deceptive trade practice whenKnowingly makes a false representation as to the results of a radon test or the need for radon mitigation
Connecticut Conn. Gen. Stat. §10-220 Duties of boards of education. Requires board of education shall provide for a uniform inspection and evaluation program of the indoor air quality within such buildings
  Conn. Gen. Stat. §10-231f Indoor Air Quality Committee. Each local and regional board of education may establish an indoor air quality committee for each school district or facility to increase staff and student awareness of facets of the environment that affect the health of the occupants of school facilities including, but not limited to, air quality, water quality and the presence of radon
  Conn. Gen. Stat. §10-291 Approval of Site Plans. Dept of Education shall not approve a site if the site is in an area of moderate or high radon potential, as indicated in the Department of Environmental Protection's Radon Potential Map, or similar subsequent publications, except where the school building project plan incorporates construction techniques to mitigate radon levels in the air of the facility
  Conn. Gen. Stat. §19a-14b Radon mitigators, diagnosticians and testing companies. Regulations
  Conn. Gen. Stat. §19a-37b Regulations establishing radon measurement requirements and procedures for evaluating radon in indoor air and reducing radon in public schools
  Conn. Gen. Stat. § 20-327b Residential contion reports. Information concerning environmental matters such as radon would be of interest to a buyer
  Conn. Gen. Stat. § 20-420 Contractors performing radon mitigation. The contractor is certified as a radon mitigator by the National Radon Safety Board or the National Environmental Health Association
  Conn. Gen. Stat. § 20-427 Holder to exhibit and advertise certificate, when. Prohibited acts. Penalties. Certificates not transferable. Expiration. Renewal. Building permits
DC DC Code § 28-4201 Radon proficiency.
Delaware Del. Code Ann. Title 16, §7402 Established radon program.
  Del. Code Ann. Title 6, §2572A Radon testing and disclosure.  Every purchaser of any interest in residential real property on which a residential dwelling exists shall be notified that said property may present the potential for exposure to radon
Florida Fla. Stat. § 404.056  Environmental radiation standards and projects; certification of persons performing measurement or mitigation services; mandatory testing; notification on real estate documents; rules
  Fla. Stat. § 553.98 Development of building codes for radon-resistant buildings
  FL ADC 64E-5.12 No person may test for or mitigate the presence of radon in Florida for a fee or other remuneration unless such person has been certified as provided by this part
Georgia No Code  
Hawaii No Code  
Idaho No Code  
Illinois 105 ILCS 5/10-20.48 Radon Testing in Schools. recommended that every occupied school building of a school district be tested every 5 years for radon pursuant to rules established by the Illinois Emergency Management Agency (IEMA).
  225 ILCS 10/5.8 Radon testing of licensed day care centers, licensed day care homes, and licensed group day care homes
  420 ILCS 44/1 to 44/90 Radon Industry Licensing Act
  420 ILCS 44/5 Legislative Declaration
  420 ILCS 46/1 to 46/99 Illinois Radon Awareness Act
  420 ILCS 52/1 to 52/99 Radon Resistant Construction Act.
  765 ILCS 77/35 Residential Real Property Disclosure report form.
  815 ILCS 505/2U; 815 ILCS 505/2V; 815 ILCS 505/2W Misrepresentation of testing or results
Indiana Ind. Code Ann. §16-41-38, 1 to 10 Radon Gas
  In. Adm. Code 410 IAC 5.1  Radon
Iowa Iowa Code §136B .1 to .5 Radon Testing
  IA ADC 641-43.1(136B) Purpose and Scope
Kansas  Kan. Stat. Ann.  § 58-3078a Radon Disclosure
Kentucky Ky. Rev. Stat. §211.9101 to .9135 Cabinets's role as radon control agency
  902 KAR 95:040 Radon Contractor Certification Program.
Louisiana La. Rev. Stat. Ann. § 40:740  et seq. This statute notes the acceptable levels for hundreds of pollutants/toxins, including radon.
Maine Me. Rev. Stat. Ann. Title 22 Ch. 165; 22 §771 to §784 Radon Registration Act
  Me. Rev. Stat. Ann. Title 33 §173 Required Disclosures
Maryland Md. Environmental Code Ann. §8-305 Testing for Radon
  Md. Housing & Community Development Code §4–930 Radon and Asbestos Abatement Pilot Program.
  Md. Real Property Code §10-603; 10-604; 10-702 Required Disclosures; Home warranty
Massachusetts Mass. Gen. Law ch. 13 § 97  Board of registration of home inspectors; duties; informational brochure on home inspections
  Mass. Gen. Law ch. 112 § 222  Licensure as home inspector; qualifications; license period; renewal; exceptions for other professionals
Michigan Mich. Comp. Laws § 565.957 Disclosures; Form
Minnesota Minn. Stat. §§116C.76 Nuclear waste depository release into groundwater
    Subdivision 1. Radionuclide release levels
  Minn. Stat. §§ 123B.57 Capital expenditure; health and safety. (e) A plan to test for and mitigate radon produced hazards.
  Minn. Stat. §§ 144.496 Radon Awareness Act; disclosure
  Minn. Stat.  §§ 326B.106 Radon code. The commissioner of labor and industry shall adopt rules for radon control as part of the State Building Code for all new residential buildings. 
Mississippi No Code  
Missouri No Code  
Montana Mont. Code Ann. §§75-3-601 to 607 Montana Radon Control Act
  Mont. Code Ann. §75-3-606 Radon disclosure statement on real estate documents -- disclosure of prior radon testing -- immunity from liability. 
Nebraska Neb. Rev. Stat. § 71-3501 et seq. To maximize the protection practicable for the citizens of Nebraska from radon or its decay products by establishing requirements for (a) appropriate qualifications for persons providing measurement and mitigation services of radon or its decay products and (b) radon mitigation system installations.
Nevada Nev. Rev. Stat. §459.300 Regulation of Mills and By-Products
New Hampshire N.H. Rev. Stat. Ann. §§ 125.9 Duties of Dept of Health and Human Services. Investigate complaints of poor indoor air quality and conduct inspections of buildings and dwellings, upon request, for the presence of radon or other health hazards present in indoor air;
  N.H. Rev. Stat. Ann. § 477:4-a Notification Required; Radon Gas and Lead Paint; disclosure
New Jersey N.J. Rev. Stat. §13:1K-14 Residential property contaminated with radon gas or radon progeny; inspection and testing; removal; certification; costs
  N.J. Rev. Stat. §18A:20-40 Radon testing; public school buildings
  N.J. Rev. Stat. §26:2D-59 to 26:2D-80 Radon gas and radon progeny; study
  N.J. Rev. Stat. §26:2D-60 Study of cancer and the presence of radon gas and radon progeny; registry of persons at risk of radiogenic lung cancer
  N.J. Rev. Stat. §26:2D-71 Certification of persons who mitigate and safeguard buildings from presence of radon
  N.J. Rev. Stat. §26:2D-73 Disclosure of address or owner of treated nonpublic building; prohibition; written waiver; exemptions; sale of building
  N.J. Rev. Stat. §52:27D-123a to 52:27D-123d Radon hazard code standards; application to school or residential buildings; contents; immunity from liability of contractor
  N.J. Rev. Stat. §52:27D-123b Construction permit for new school or residential building in tier one area; conditions for issuance
New Mexico No Code  
New York N.Y. Real Property Law § 462 Radon Disclosure
  10 NYCCR 16.130 Radon testing and reporting
North Carolina N.C. Gen. Stat. § 47E-4. Required disclosures Radon Disclosure
North Dakota No Code  
Ohio Oh. Adm. Code 3701-69 Radon Testing, Mitigation and Laboratories
Oregon Or. Rev. Stat. § 433.521 Indoor air quality standards; establishment; content
  Or. Rev. Stat. § 105.464 Radon Disclosure
Oklahoma No Code  
Pennsylvania Pa. Cons. Stat. Title 63 § 2001 to 2014 Radon Certification Act.
  Pa. Cons. Stat. Title 35 § 7110.101-7131.1101 Empowering the Department of Environmental Resources to implement a radiation protection program.
  25 Pa. Code Ch. 24 Radon Certification Regulations
Rhode Island R.I. Gen. Laws § 5-20.8-2 Real Estate Disclosure Requirements, including radon.
  R.I. Gen. Laws § 23-61-1 to 23-61-9 The general assembly recognizes that radon is an odorless, colorless, tasteless, and radioactive gas that occurs naturally in soil and groundwater; that radon enters homes and buildings through openings in foundations, decays to form radon progeny, and unless vented to the atmosphere, accumulates in buildings and becomes hazardous to human health, and prolonged exposure to elevated concentrations of radon decay products has been associated with increases in the risk of lung cancer. The general assembly recognizes that there is a need to protect human health and prevent exposure to elevated concentrations of radon.
  Rules and Regulations For Radon Control R23-61-RC Regulations for Radon Control.
  R.I. Gen. Laws § 42-72.1-5 General License. Provides an exemption for a school age child day care program  for a separate fire, building, or radon inspection, when the program is at a elementary or secondary school which has already been found in compliance with the inspections.
South Carolina S.C. Code 1976 § 27-50-40 Real Estate Disclosure Requirements, including radon.
South Dakota S.D. Codified Laws §43-4-44 Property condition disclosure statement.
Tennessee Tenn. Code Ann. § 49-2-121 School indoor air quality. Encourages LEA to test for radon.
Texas Texas Health and Safety Code Ann. §401.233 Radioactive Materials; Monitoring Requirements
  Texas Property Code §5.008401.233 Real Estate Disclosure Requirements, including radon.
Utah Utah Code Ann. §26-7-7 Radon Awareness Campaign
  Utah Code Ann. §58-55-305 Licensing for radon mitigation system installers.
Vermont No Code  
Virginia Va. Code §22.1-138 Minimum standards for public school buildings
  Va. Code §32.1-228.1 Designates the Department of Health as the state radiation control agency.
  Va. Code §32.1-228.01 Requires radon screening, testing and mitigation proficiency.
Washington Wash. Code § 4.24.560 Defense for injuries from indoor air pollutants.
  Wash. Code §19.27.190 RRNC. Requires the minimization of indoor radon gas in new construction.
  Wash. Code § 64.06.020 Real Estate Disclosure Requirements, including radon.
  Wash. Code § 70.162.005 Indoor air quality standards; establishment; content
West Virginia W. Va. Code §16-34-1 to 16-34-14 Licensure of radon mitigators, testers, contractors and laboratories.
  W. Va. Code §18-9E-3  Air quality in new schools; includes radon testing.
  W. Va. Code §48-15-201 Penalties for radon licensure.
Wisconsin Wis. Stat. §254.34(h) Authorizes Department of Health to address radon hazards, including training and registration.
Wyoming  No Code  
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