Tag: Local Government

  • Radon Laws in Idaho: Testing, Disclosure & Mitigation Rules

    Radon Laws in Idaho: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Idaho regulates radon primarily through statutory property condition disclosure requirements and public health awareness initiatives. Under the Idaho Property Condition Disclosure Act (Idaho Code § 55-2501 et seq.), residential home sellers must provide prospective buyers with a standardized disclosure statement disclosing known material defects, including environmental hazards and historical radon test results. Idaho does not operate a direct state licensing program for radon mitigators or testing specialists, pointing consumers to national NRPP and NRSB certification registries. Geologically, granitic batholiths and volcanic soils across southern and central Idaho create substantial radon potential.

    Testing Requirements

    Indoor radon testing is voluntary for private residential homeowners and landlords in Idaho; the state imposes no statutory mandate compelling property owners to test existing single-family dwellings or rental units prior to occupancy or sale. Similarly, Idaho law does not mandate routine radon testing in public or private K-12 school buildings or licensed commercial childcare facilities, though the Idaho Department of Health and Welfare (IDHW) strongly encourages school districts to conduct voluntary testing using EPA and ANSI/AARST protocols.

    Real-Estate Disclosure

    Real estate disclosure is codified under the Idaho Property Condition Disclosure Act, Idaho Code §§ 55-2501 to 55-2518. Under Idaho Code § 55-2504, sellers of residential real property (1 to 4 dwelling units) must complete a Seller’s Property Condition Disclosure Form and deliver it to the buyer within 10 days after acceptance of the buyer’s offer (§ 55-2509). The statutory disclosure form requires sellers to disclose actual knowledge of environmental hazards affecting the property, including hazardous substances and past testing reports. While the act obligates sellers to disclose known historical test records and installed mitigation equipment, it does not compel sellers to commission new testing, leaving testing contingencies to purchase negotiations.

    Mitigator & Tester Certification

    Idaho has no state licensing requirement for radon measurement technicians or mitigation contractors, per the Idaho Department of Health and Welfare, verified November 2026. The state maintains no state-administered radon licensing board or regulatory credential. Instead, IDHW officially directs homeowners, builders, and real estate professionals to hire contractors certified through the two national proficiency programs recognized by the EPA: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). Contractors must comply with local municipal building and electrical trade permits when installing fans and running sub-slab piping.

    New Construction

    Idaho does not enforce a statewide mandatory building code requiring passive Radon-Resistant New Construction (RRNC) in all new residential buildings. While the Idaho Building Code Board incorporates the International Residential Code (IRC), Appendix F (Radon Control Methods) is not universally mandated for single-family residential construction across the state. However, individual local jurisdictions facing elevated geological risk (such as Blaine County, Ketchum, and Sun Valley) have adopted Appendix F locally, making passive soil-gas ventilation mandatory in new residential builds within their boundaries.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones and IDHW geological surveys, Idaho possesses extensive radon potential. Nineteen Idaho counties—Benewah, Blaine, Boise, Bonner, Boundary, Butte, Camas, Clark, Clearwater, Custer, Elmore, Fremont, Gooding, Idaho, Kootenai, Latah, Lemhi, Shoshone, and Valley—are designated as EPA Zone 1 (High Potential), where predicted average indoor screening levels exceed the national action level of 4.0 pCi/L. Ada (Boise) and Bonneville (Idaho Falls) are Zone 2. Of Idaho’s 44 counties, 19 are Zone 1, 20 are Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L), and 5 are Zone 3. IDHW adopts the federal action level benchmark of 4.0 pCi/L, noting that approximately two out of five homes tested in Idaho exhibit elevated concentrations. For regional county risk details, visit our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state’s official public health initiative is the Idaho Department of Health and Welfare Indoor Radon Program, based within the Division of Public Health. IDHW provides educational guidance, tracks regional screening data, and partners with testing laboratories to distribute free short-term test kits to Idaho residents through radonidaho.org. Homeowners and contractors can order test kits, review county testing maps, and locate certified contractors through the official Idaho Health and Welfare Radon Program portal or by calling the program hotline at 800-445-8647.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. Statutory disclosure requirements and local building codes are subject to legislative amendment. Property buyers, sellers, landlords, and contractors should verify current rules directly with the Idaho Department of Health and Welfare or a licensed Idaho attorney.

    Official Sources: Idaho Code §§ 55-2501–55-2518; Idaho Department of Health and Welfare (Division of Public Health); U.S. Environmental Protection Agency (Map of Radon Zones).

    To review how Idaho’s regulatory approach compares to other states across the nation, consult our master guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in West Virginia: Testing, Disclosure & Mitigation Rules

    Radon Laws in West Virginia: Testing, Disclosure & Mitigation Rules

    The Short Answer

    West Virginia enforces a comprehensive statutory licensing framework for radon professionals, paired with statutory confidentiality safeguards and common-law real estate disclosure rules. Under West Virginia Code §§ 16-34-1 through 16-34-14, it is unlawful for any individual or business to perform radon testing, mitigation, or laboratory analysis for compensation without holding an active state license issued by the West Virginia Department of Health. The state maintains strict statutory confidentiality over residential radon test records under W. Va. Code § 16-34-9. Geologically, West Virginia experiences elevated radon concentrations, particularly in the karst limestone formations of the Eastern Panhandle.

    Testing Requirements

    Indoor radon testing is voluntary for private single-family homeowners and residential landlords under West Virginia law; the state does not compel property owners to test existing dwellings prior to occupancy or sale. In addition, West Virginia statutes do not mandate routine radon testing in public or private K-12 school buildings or commercial child care facilities, though the Office of Environmental Health Services (OEHS) strongly encourages school administrators to test voluntarily using licensed measurement specialists adhering to EPA and ANSI/AARST protocols.

    Real-Estate Disclosure

    West Virginia does not have a standalone statutory real estate radon disclosure act, per the West Virginia Department of Health, verified November 2026. Real estate transactions in West Virginia operate under traditional principles of caveat emptor (“buyer beware”), modified by common-law rules governing the disclosure of known material latent defects. Licensed real estate brokers in West Virginia are legally obligated under Real Estate Commission regulations to act honestly and disclose known material defects affecting property habitability or health. Furthermore, under W. Va. Code § 16-34-9, the state and licensed contractors are prohibited from releasing residential radon test records to third parties without the owner’s written consent, protecting homeowner privacy while leaving transaction testing to contractual inspection contingencies.

    Mitigator & Tester Certification

    Commercial licensing is strictly mandatory in West Virginia under W. Va. Code Chapter 16, Article 34 and legislative rule 64 CSR 78. Anyone performing radon testing, mitigation, or laboratory analysis for compensation must hold an active license from the West Virginia Department of Health, Office of Environmental Health Services (OEHS). OEHS administers four specific license types: Radon Tester, Radon Mitigation Specialist, Radon Mitigation Contractor, and Radon Laboratory. To obtain a state license, applicants must complete state-approved training, maintain active national certification through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), pass background reviews, and submit mandatory semi-annual activity reports. Operating without a license is a statutory misdemeanor under W. Va. Code § 16-34-12.

    New Construction

    West Virginia has not enacted a mandatory statewide building code requiring passive or active Radon-Resistant New Construction (RRNC) in all new single-family residential dwellings. Building code adoption and enforcement operate under local county and municipal jurisdiction. While the State Fire Commission adopts model building codes, Appendix F of the International Residential Code is not universally enforced across all residential construction statewide, though voluntary implementation is common in high-risk Panhandle communities.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones, West Virginia exhibits substantial radon potential. The Eastern Panhandle counties—including Jefferson, Berkeley, and Morgan—along with several central limestone counties (such as Greenbrier, Mercer, and Monroe), are designated as EPA Zone 1 (High Potential), where predicted average indoor screening levels exceed 4.0 pCi/L. Remaining counties fall within Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L). OEHS adopts the federal action level benchmark of 4.0 pCi/L, strongly advising active mitigation for indoor levels at or above 4.0 pCi/L. For complete county classifications, visit our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state regulatory and educational authority is the West Virginia Department of Health Radon Program, housed within the Office of Environmental Health Services (OEHS), Radiation, Toxics and Indoor Air Division. The program manages professional licensing, conducts regulatory compliance audits, tracks statewide testing data, and provides subsidized, low-cost short-term test kits to West Virginia residents. Homeowners and contractors can verify licensed professionals and order test kits through the official West Virginia OEHS Radon Program portal or by calling the program division at 304-558-2981.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. State statutory licensing requirements and legislative rules are subject to amendment. Property buyers, sellers, landlords, and contractors should verify current rules directly with the West Virginia Department of Health or a licensed attorney.

    Official Sources: West Virginia Code §§ 16-34-1–16-34-14; West Virginia Legislative Rule 64 CSR 78; West Virginia Department of Health (Office of Environmental Health Services); U.S. Environmental Protection Agency.

    To compare West Virginia’s licensing standards with neighboring Appalachian states, consult our complete guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Utah: Testing, Disclosure & Mitigation Rules

    Radon Laws in Utah: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Utah regulates radon through professional contractor licensing for mitigators, standardized real estate disclosures, and targeted public health testing initiatives. Under Utah Division of Professional Licensing (DOPL) regulations, contractors installing radon mitigation systems must hold a valid state contractor license, specifically the S354 Radon Mitigation Contractor specialty license or general building credentials. Residential home sellers are required under standard Utah Real Estate Commission forms to disclose known environmental hazards, including historical radon tests. Testing reveals that approximately one in three Utah homes tests above the EPA action level, driven by uranium-bearing granitic and volcanic geology.

    Testing Requirements

    Radon testing is voluntary for private single-family homeowners and residential landlords in Utah; state law does not compel existing property owners to test indoor air prior to occupancy or sale. Similarly, Utah statutes do not mandate routine radon testing in public or private K-12 school buildings, though the Utah Department of Environmental Quality (UDEQ) Indoor Radon Program actively partners with local school districts and the Utah State Board of Education to conduct voluntary school screening following ANSI/AARST commercial building protocols.

    Real-Estate Disclosure

    Real estate disclosure is governed under general Utah contract law and the Utah Real Estate Commission approved Seller’s Property Condition Disclosure form (authorized under Utah Code Title 57). Sellers of residential real property are legally obligated to disclose known material defects affecting property value or habitability. Section 11 of the standardized disclosure form explicitly questions whether the seller is aware of any past radon testing, the test results, or the presence of an active or passive radon mitigation system. While the disclosure form requires truthful reporting of historical test records, it does not mandate pre-closing testing, leaving testing contingencies to contract negotiation.

    Mitigator & Tester Certification

    Contractor licensing is mandatory in Utah for individuals and businesses installing radon mitigation systems. Under Utah Code Title 58, Chapter 55 and Utah Administrative Code R156-55a, contractors performing mitigation must hold an active license from the Utah Division of Professional Licensing (DOPL). Specifically, DOPL establishes the S354 Radon Mitigation Contractor classification (or recognizes general building contractors B100/R100). To obtain the S354 license, applicants must demonstrate active national certification through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). For individuals performing measurement or testing only, DOPL does not require a specialty contractor license, but UDEQ strongly recommends NRPP or NRSB certification.

    New Construction

    Radon-resistant new construction is governed under the Utah State Construction and Fire Codes Act (Utah Code Title 15A), which adopts the International Residential Code (IRC). While IRC Appendix F (Radon Control Methods) is included within model codes, Utah has not enacted a blanket statewide mandate forcing passive RRNC in all new single-family homes. Instead, adoption of Appendix F is left to local municipal and county building departments. Several high-risk municipalities and jurisdictions along the Wasatch Front and mountain resort valleys (such as Park City and Summit County) enforce passive radon rough-ins under local ordinances.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones and UDEQ geological surveys, Utah features complex mountainous terrain with significant radon potential. Several central and eastern counties—including Carbon, Duchesne, Grand, Piute, Sanpete, Sevier, and Uintah—are designated as EPA Zone 1 (High Potential), where predicted average screening levels exceed 4.0 pCi/L. Widespread Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L) counties cover the densely populated Wasatch Front, including Salt Lake, Utah, Davis, and Weber counties, where state surveys indicate approximately 33 percent of tested homes exceed 4.0 pCi/L. UDEQ adopts the federal action level benchmark of 4.0 pCi/L. For complete county classifications, visit our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state regulatory and educational authority is the Utah Department of Environmental Quality Radon Program, operating within the Division of Waste Management and Radiation Control. UDEQ coordinates statewide public education, tracks testing data, and partners with testing laboratories to provide subsidized, low-cost short-term and long-term test kits to Utah residents. Homeowners and industry professionals can order test kits and verify licensed S354 contractors through the official UDEQ Radon Program portal or by contacting program staff at 801-536-0200.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. Contractor licensing classifications and local building codes are subject to administrative update. Real estate buyers, sellers, landlords, and contractors should verify current rules directly with the Utah Division of Professional Licensing, UDEQ, or a qualified attorney.

    Official Sources: Utah Code Title 58, Chapter 55; Utah Administrative Code R156-55a; Utah Department of Environmental Quality (Division of Waste Management and Radiation Control); U.S. Environmental Protection Agency.

    To compare Utah’s contractor licensing model with other Western states, explore our master guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Wisconsin: Testing, Disclosure & Mitigation Rules

    Radon Laws in Wisconsin: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Wisconsin regulates radon primarily through mandatory real estate condition disclosures and public health education coordinated through a statewide network of regional information centers. Under Wisconsin Statutes Chapter 709, residential sellers must complete a statutory Real Estate Condition Report disclosing known environmental hazards, including historical radon test results and installed mitigation equipment. Wisconsin does not operate a direct state licensing program for radon mitigators or testing specialists, pointing consumers to national NRPP and NRSB certification registries. In residential construction, the Wisconsin Uniform Dwelling Code mandates foundation sealing and sub-slab moisture barriers that provide passive soil-gas protection.

    Testing Requirements

    Indoor radon testing is voluntary for private single-family homeowners and residential landlords in Wisconsin; the state does not compel property owners to test existing dwellings prior to occupancy or sale. Similarly, Wisconsin statutes do not mandate routine radon testing in public or private K-12 school buildings or commercial child care facilities, though the Wisconsin Department of Health Services (DHS) and local public health divisions actively encourage school administrators to test voluntarily using ANSI/AARST school measurement protocols.

    Real-Estate Disclosure

    Real estate disclosure is governed by Wisconsin Statutes Chapter 709 (§§ 709.01 to 709.08). Under Wis. Stat. § 709.02, sellers of residential real estate (1 to 4 dwelling units) must deliver a completed Real Estate Condition Report (RECR) to prospective buyers within 10 days of accepting a purchase offer. The statutory disclosure form specifically requires sellers to disclose known environmental defects, including elevated radon gas levels, prior test reports, and whether an active or passive mitigation system is installed on the property. Failing to disclose known radon defects exposes sellers to statutory rescission rights and financial liability, though the law does not compel sellers to test untested homes.

    Mitigator & Tester Certification

    Wisconsin has no state licensing requirement for radon measurement technicians or mitigation contractors, per the Wisconsin Department of Health Services, verified November 2026. The state maintains no state-administered radon licensing board or regulatory credential. Instead, Wisconsin DHS officially directs homeowners, buyers, and local building officials to hire professionals certified through the two national proficiency programs recognized by the EPA: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). Contractors must comply with local municipal building and electrical trade permits when modifying foundations or wiring mitigation fans.

    New Construction

    Construction standards in Wisconsin are governed by the Uniform Dwelling Code (UDC), codified in Wisconsin Administrative Code SPS Chapter 321. While SPS Chapter 321 does not universally mandate continuous passive radon vent pipes statewide, it enforces stringent sub-slab moisture and soil-gas retarder standards—including granular base courses and 6-mil polyethylene vapor membranes—alongside foundation waterproofing requirements that limit soil gas infiltration. Furthermore, individual municipalities and tribal jurisdictions (such as Forest County Potawatomi) have adopted model codes such as IRC Appendix F requiring complete passive radon-resistant new construction.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones, Wisconsin features extensive EPA Zone 1 (High Potential) coverage across southern, eastern, and central counties—including Dane (Madison), Waukesha, Rock, Dodge, and Fond du Lac—where predicted average screening levels exceed 4.0 pCi/L. Remaining northern and western counties fall within Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L). Wisconsin DHS enforces the federal EPA action level of 4.0 pCi/L, noting that approximately one in three tested Wisconsin homes exhibits concentrations above this threshold. For complete geological risk details, visit our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state’s official public health initiative is the Wisconsin Department of Health Services Radon Program, administered in partnership with local public health agencies through a network of 16 regional Radon Information Centers (RICs). The RIC network provides local testing advice, distributes subsidized test kits, and assists residents with interpreting test scores. Homeowners and contractors can locate their nearest regional information center and order test kits through the official Wisconsin DHS Radon Program portal or by calling the state radon line at 608-266-1120.

    Sources & Limits

    This regulatory summary is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering guidance. Statutory disclosure mandates and dwelling codes are subject to legislative amendment. Real estate buyers, sellers, landlords, and contractors should verify current rules directly with the Wisconsin Department of Health Services or a licensed real estate attorney.

    Official Sources: Wisconsin Statutes Chapter 709; Wisconsin Administrative Code SPS Chapter 321; Wisconsin Department of Health Services (DHS); U.S. Environmental Protection Agency.

    To examine how Wisconsin’s regulatory approach compares to other states, consult our comprehensive guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Connecticut: Testing, Disclosure & Mitigation Rules

    Radon Laws in Connecticut: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Connecticut enforces a comprehensive radon regulatory regime that combines statutory credentialing mandates, periodic public school testing, and mandatory real estate disclosures. Under Connecticut General Statutes (CGS) § 20-420, it is unlawful for any contractor to perform radon mitigation without holding active national certification (NRPP or NRSB) and registration as a Home Improvement Contractor with the Department of Consumer Protection. Public schools are mandated under CGS § 10-220(d) to be evaluated for radon before January 1, 2008 and every three years thereafter. Residential sellers must disclose known radon test records under CGS § 20-327b, and the state building code requires radon-resistant construction in designated high-risk jurisdictions.

    Testing Requirements

    Connecticut mandates indoor radon testing in sensitive educational facilities. Under CGS § 10-220(d), local and regional boards of education are statutorily required to conduct periodic indoor air quality assessments, including radon testing, in every public school building (grades K-12), repeating evaluations at least once every three years following Connecticut Department of Public Health (DPH) and EPA protocols. Child day care centers licensed by the Office of Early Childhood must also undergo testing prior to initial licensure and periodic renewal. For private single-family homes and general residential rental properties, radon testing remains voluntary under state law.

    Real-Estate Disclosure

    Residential property transactions are governed by Connecticut General Statutes § 20-327b. Before a purchase contract is finalized, sellers of residential real estate (1 to 4 units) must provide prospective buyers with a written Residential Property Condition Disclosure Report prescribed by the Department of Consumer Protection. The statutory report includes explicit questions concerning whether the seller has knowledge of any radon testing, the most recent test scores, and whether an active or passive radon mitigation system is installed on the property. Sellers must disclose known historical data, though they are not statutorily compelled to commission new tests.

    Mitigator & Tester Certification

    Contractor credentialing is strictly enforced under CGS § 20-420 and CGS § 19a-14b. No person or business may advertise or perform radon mitigation services in Connecticut without providing proof of active national certification through either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), and maintaining an active Home Improvement Contractor (HIC) registration with the Department of Consumer Protection (DCP). Under CGS § 19a-14b, the Connecticut Department of Public Health maintains and publishes the official registry of qualified mitigation and measurement professionals operating in the state.

    New Construction

    Radon-resistant construction is integrated into the Connecticut State Building Code, which incorporates the International Residential Code (IRC) Appendix F. Builders constructing new one- and two-family dwellings in designated high-potential municipalities (primarily within EPA Zone 1 regions such as Middlesex and Fairfield counties) must install passive radon-resistant features during initial construction. Required techniques include sub-slab aggregate or soil-gas collectors, 6-mil polyethylene membranes, sealed perimeter expansion joints, and a routed vertical vent pipe terminating above the roofline.

    Radon Zones & the Action Level

    The EPA Map of Radon Zones designates Fairfield and Middlesex counties in Connecticut as EPA Zone 1 (High Potential), where predicted average indoor screening levels exceed 4.0 pCi/L. The remaining counties—including Hartford, New Haven, New London, Litchfield, Tolland, and Windham—fall within Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L). Connecticut DPH establishes the state action level at the federal standard of 4.0 pCi/L, while advising that mitigation be considered for levels between 2.0 and 4.0 pCi/L to reduce lifetime radiation exposure. For comprehensive regional classifications, review our EPA Radon Zone Map guide.

    The State’s Radon Program

    The official regulatory and public health authority is the Connecticut Department of Public Health Radon Program, housed within the Environmental Health and Drinking Water Branch. The DPH Radon Program publishes the statewide contractor roster, provides protocol oversight for school testing under CGS § 10-220(d), and distributes public education and subsidized test kits through local health departments. Homeowners, school administrators, and contractors can access official lists and ordering information via the Connecticut DPH Radon Program portal or by calling 860-509-7367.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. Statutory credentialing requirements and school testing rules are subject to legislative amendment. Real estate buyers, sellers, landlords, and contractors should verify current rules directly with the Connecticut Department of Public Health or a qualified real estate attorney.

    Official Sources: Connecticut General Statutes §§ 20-420, 19a-14b, 10-220(d), 20-327b; Connecticut State Building Code Appendix F; Connecticut Department of Public Health; U.S. Environmental Protection Agency.

    To compare Connecticut’s statutory standards with neighboring states, consult our complete guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Michigan: Testing, Disclosure & Mitigation Rules

    Radon Laws in Michigan: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Michigan regulates radon primarily through mandatory real estate seller disclosures and targeted residential building code requirements in high-risk counties. Under the Michigan Seller Disclosure Act (MCL § 565.957), residential home sellers must complete a statutory disclosure statement disclosing known environmental hazards, including radon gas and historical test data. Michigan does not license radon testers or mitigators through a dedicated state radon board, instead directing the public to national NRPP and NRSB certification registries. In new residential construction, the Michigan Residential Code enforces mandatory passive radon-resistant construction across nine southern EPA Zone 1 counties.

    Testing Requirements

    Indoor radon testing is voluntary for private single-family homeowners and residential landlords in Michigan; state law does not compel property owners to test existing residential dwellings prior to leasing or sale. Similarly, Michigan does not impose a statewide statutory mandate requiring regular radon screening in public K-12 schools or licensed childcare facilities, although the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and local health departments actively encourage voluntary school testing using standardized EPA protocols.

    Real-Estate Disclosure

    Real estate disclosure is codified under the Michigan Seller Disclosure Act, Michigan Compiled Laws (MCL) §§ 565.951 to 565.966. Under MCL § 565.957, sellers of residential real property (1 to 4 units) must deliver a completed Seller’s Disclosure Statement to prospective buyers before executing a binding purchase agreement. Section 10 of the statutory form specifically requires the seller to disclose knowledge of any environmental hazards on the property, explicitly listing radon gas alongside lead, asbestos, and underground tanks. While sellers must truthfully disclose known historical test results or installed mitigation systems, the act does not require sellers to perform testing as a condition of sale, leaving testing contingencies to purchase agreements.

    Mitigator & Tester Certification

    Michigan has no direct state licensing requirement specifically for radon mitigators or testing contractors, per the Michigan Department of Environment, Great Lakes, and Energy, verified November 2026. EGLE does not administer an independent state radon licensing exam or board. Instead, EGLE officially recommends that property owners hire contractors who maintain active national certifications through the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). However, contractors installing mitigation systems must comply with Michigan Department of Licensing and Regulatory Affairs (LARA) trade regulations, obtaining residential builder or maintenance and alteration licenses and local electrical permits for fan wiring.

    New Construction

    Radon-resistant new construction is mandatory in designated regions under the Michigan Residential Code (incorporating IRC Appendix F). Michigan mandates passive radon-resistant new construction (RRNC) techniques—including gas-permeable aggregate or soil-gas matting, 6-mil polyethylene ground retarders, foundation sealing, and a continuous vertical vent pipe—across nine designated EPA Zone 1 counties: Branch, Calhoun, Cass, Hillsdale, Jackson, Kalamazoo, Lenawee, St. Joseph, and Washtenaw. In all other Michigan counties, RRNC remains voluntary unless adopted by local municipal ordinance.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones, Michigan contains nine EPA Zone 1 (High Potential) counties located in the southern tier, where predicted average indoor screening levels exceed the national action level of 4.0 pCi/L. Central and northern Lower Peninsula counties and parts of the Upper Peninsula are classified as Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L) or Zone 3 (Low Potential, < 2.0 pCi/L). EGLE enforces the federal EPA action level benchmark of 4.0 pCi/L, advising that mitigation systems be installed when indoor levels meet or exceed 4.0 pCi/L. For complete county breakdown, consult our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state regulatory and educational authority is the Michigan Department of Environment, Great Lakes, and Energy (EGLE) Radon Program, managed within the Remediation and Redevelopment Division. EGLE provides technical assistance, coordinates with local health departments, maintains public information on certified contractors, and helps residents purchase low-cost short-term and long-term test kits. Homeowners can order test kits and access educational resources through the official EGLE Radon Program portal or by calling the state radon hotline at 800-723-6642 (800-RADON-GAS).

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. State statutory disclosure requirements and building codes are subject to legislative amendment. Property buyers, sellers, landlords, and contractors should verify current rules directly with EGLE or a qualified Michigan real estate attorney.

    Official Sources: Michigan Compiled Laws § 565.957; Michigan Residential Code Appendix F; Michigan Department of Environment, Great Lakes, and Energy (EGLE); U.S. Environmental Protection Agency.

    To review how Michigan’s policies compare with other jurisdictions, explore our nationwide guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Kentucky: Testing, Disclosure & Mitigation Rules

    Radon Laws in Kentucky: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Kentucky regulates radon through mandatory professional credentialing and codified real estate disclosure. Under Kentucky Revised Statutes (KRS) §§ 211.9101 through 211.9135, all individuals and businesses providing radon measurement, mitigation, or laboratory services for fee must be officially registered and licensed with the Kentucky Cabinet for Health and Family Services (CHFS). Residential home sellers are required under KRS § 324.360 to disclose known radon test records and mitigation equipment using a standardized condition disclosure form that contains statutory health warnings. Due to extensive karst limestone topography, elevated indoor radon levels are widespread across central and western Kentucky.

    Testing Requirements

    Indoor radon testing is voluntary for private single-family homeowners and residential landlords in Kentucky. State law does not require existing residential properties to undergo mandatory testing prior to lease execution or occupancy. In addition, Kentucky does not currently mandate radon testing in public or private school buildings or commercial child care facilities by statute, although the Kentucky Department for Public Health (KDPH) strongly recommends that school districts and daycare centers conduct routine baseline screening using licensed measurement specialists adhering to ANSI/AARST standards.

    Real-Estate Disclosure

    Property transaction disclosures are governed by KRS § 324.360 and Kentucky Real Estate Commission (KREC) administrative regulations (201 KAR 11:121). In residential transactions involving licensed real estate licensees, the seller must complete the Seller’s Disclosure of Property Condition form prior to contract acceptance. The form mandates that sellers disclose any prior radon testing conducted on the premises, provide historical test scores, and state whether an active or passive radon mitigation system is installed. The KREC disclosure form explicitly incorporates mandatory statutory warning text advising prospective purchasers that radon is a radioactive gas presenting lung cancer risks and recommending independent professional testing.

    Mitigator & Tester Certification

    Professional licensing is mandatory in Kentucky under KRS §§ 211.9101 to 211.9135 and administrative regulation 902 KAR 95:040. Anyone offering radon measurement, mitigation, or laboratory analysis for compensation must be registered biennially with the Cabinet for Health and Family Services. To qualify for state registration, individuals must hold current national proficiency certification from either the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), adhere to ANSI/AARST standard operating procedures, maintain liability insurance, and submit mandatory semi-annual activity reports to the state radon coordinator.

    New Construction

    Kentucky has not enacted a blanket statewide mandate requiring Radon-Resistant New Construction (RRNC) in all new residential buildings. The Kentucky Residential Code (KRC), based on the International Residential Code, includes Appendix F (Radon Control Methods), but adoption is largely left to local building code enforcement departments or voluntary implementation by builders. However, in regions with intense karst development (such as the Bluegrass and Pennyroyal regions), many local planning commissions and progressive homebuilders voluntarily incorporate passive sub-slab suction systems during initial foundation pours.

    Radon Zones & the Action Level

    The EPA Map of Radon Zones classifies much of Kentucky—including the central Bluegrass region (Fayette County/Lexington), north-central counties (Jefferson County/Louisville), and south-central karst basins (Warren County/Bowling Green)—as EPA Zone 1 (High Potential), where indoor levels frequently exceed the federal action level of 4.0 pCi/L. Eastern Appalachian counties and western coalfield basins are primarily designated as Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L). KDPH adopts the EPA action level of 4.0 pCi/L, strongly urging mitigation for test results at or above this threshold. For complete geological zone details, explore our EPA Radon Zone Map guide.

    The State’s Radon Program

    The official state regulatory and educational authority is the Kentucky Department for Public Health Radon Program, housed within the Radiation, Food and Safety Branch of the Cabinet for Health and Family Services. KDPH maintains the official statewide registry of registered measurement and mitigation contractors, tracks regional screening data, and coordinates with local health departments to distribute free or discounted short-term test kits to Kentucky residents. Homeowners and industry professionals can verify credentials and access test kits via the official CHFS Radon Program website or by contacting program staff at 502-564-4856.

    Sources & Limits

    This regulatory summary is published for educational and informational purposes only and does not constitute formal legal, building code, or engineering guidance. Statutory licensing rules and real estate disclosure requirements are subject to regulatory updates. Real estate buyers, sellers, landlords, and contractors should verify current rules directly with the Kentucky Department for Public Health or qualified legal counsel.

    Official Sources: Kentucky Revised Statutes §§ 211.9101–211.9135, § 324.360; 902 KAR 95:040; 201 KAR 11:121; Kentucky Cabinet for Health and Family Services; U.S. Environmental Protection Agency.

    To see how Kentucky’s registration rules compare across the nation, visit our master guide to radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in North Dakota: Testing, Disclosure & Mitigation Rules

    Radon Laws in North Dakota: Testing, Disclosure & Mitigation Rules

    The Short Answer

    North Dakota regulates radon primarily through real estate transaction transparency and environmental public health education rather than direct state contractor licensing. Under North Dakota Century Code § 47-10-02.2, residential real estate sellers must provide written disclosures detailing any known radon concentrations, prior test reports, and existing mitigation systems before signing a purchase agreement. The state does not operate an independent licensing program for radon mitigators or testing specialists, officially directing consumers to nationally certified professionals. Geologically, North Dakota faces exceptionally high radon potential, with the U.S. Environmental Protection Agency classifying all 53 counties as EPA Zone 1.

    Testing Requirements

    Radon testing is voluntary for private residential homeowners and landlords in North Dakota; the state imposes no statutory mandate requiring testing in existing single-family dwellings or private rental properties. Similarly, North Dakota law does not mandate routine radon testing in public or private K-12 school buildings or licensed commercial childcare facilities. However, the North Dakota Department of Environmental Quality (NDDEQ) strongly encourages testing across all residential buildings, noting that elevated indoor levels are widespread throughout the state due to glacial till deposits containing radium and uranium.

    Real-Estate Disclosure

    Real estate disclosure is codified under North Dakota Century Code (N.D.C.C.) § 47-10-02.2. Before completing a binding purchase agreement for residential real property, the seller must deliver a written disclosure statement disclosing whether the property has ever been tested for radon gas and the specific results of any such tests. Furthermore, if a radon mitigation system or soil-gas depressurization equipment has been installed on the premises, the seller must disclose its operational status and provide copies of any available inspection records. While the statute requires truthful disclosure of known conditions, it does not compel sellers to conduct new testing prior to closing, leaving testing contingencies to contract negotiations.

    Mitigator & Tester Certification

    North Dakota has no state licensing requirement for radon measurement technicians or mitigation contractors, per the North Dakota Department of Environmental Quality, verified November 2026. The state maintains no state-administered regulatory board or credentialing registry for radon professionals. Instead, the NDDEQ officially directs homeowners, builders, and real estate professionals to hire contractors certified through the two national proficiency programs recognized by the EPA: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). Contractors performing structural alterations or electrical wiring during fan installations must comply with local municipal building and electrical trade permits.

    New Construction

    North Dakota has not enacted a mandatory statewide building code requiring passive or active Radon-Resistant New Construction (RRNC) systems in new residential structures. Building code adoption and enforcement operate under local municipal and county jurisdiction across the state. While individual cities (such as Fargo and Bismarck) may adopt model building standards such as the International Residential Code (IRC) Appendix F at local discretion, there is no universal state mandate forcing homebuilders to install passive sub-slab suction pits or vertical vent pipes.

    Radon Zones & the Action Level

    According to the EPA Map of Radon Zones, North Dakota is one of the few states in the nation where all 53 counties are designated as EPA Zone 1 (High Potential), indicating predicted average indoor radon screening concentrations exceeding the national action level of 4.0 picocuries per liter of air (pCi/L). State health surveys confirm that over 60 percent of tested North Dakota basements exceed 4.0 pCi/L. The NDDEQ advises property owners to install active mitigation systems if indoor radon levels equal or exceed 4.0 pCi/L, and to consider remediation if levels range between 2.0 and 4.0 pCi/L. For comprehensive regional risk analysis and county classifications, explore our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state’s official public health initiative is the North Dakota Department of Environmental Quality Radon Program, administered under the Division of Waste Management. The program provides educational resources, technical guidance, and distributes free or subsidized short-term radon test kits to North Dakota homeowners while supplies last. Residents can request test kits, access county-level screening data, and review EPA mitigation guidance directly through the NDDEQ Radon Program portal or by contacting the division office at 701-328-5166.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or engineering counsel. State statutory disclosure requirements and local municipal building codes are subject to legislative amendment. Property buyers, sellers, landlords, and contractors should verify current rules directly with the North Dakota Department of Environmental Quality or a licensed real estate attorney.

    Official Sources: North Dakota Century Code § 47-10-02.2; North Dakota Department of Environmental Quality (Division of Waste Management); U.S. Environmental Protection Agency (Map of Radon Zones).

    For national comparative analysis and federal benchmarks, return to our master overview of radon regulations across the United States or inspect the EPA Radon Zone Map.

  • Radon Laws in Washington: Testing, Disclosure & Mitigation Rules

    Radon Laws in Washington: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Washington regulates radon primarily through mandatory building codes in designated high-risk counties and statutory real estate disclosures. Under the Washington State Residential Code (WSRC Appendix F), new residential construction must incorporate passive radon-resistant features across seven designated Zone 1 counties in eastern Washington. In real estate transactions, sellers of residential property must complete a statutory disclosure statement disclosing known radon tests or systems under RCW 64.06.020. The state does not administer an independent radon contractor licensing board, instead directing consumers to national NRPP and NRSB certification registries.

    Testing Requirements

    Radon testing in Washington is entirely voluntary for private single-family homeowners, residential landlords, and commercial property owners. Washington has no statewide statutory mandate compelling testing in private rental properties. In addition, there is no state law requiring routine radon testing in public or private K-12 schools, childcare centers, or state-owned buildings, though the Washington State Department of Health (WA DOH) strongly encourages school districts in high-risk eastern Washington counties to test facilities periodically.

    Real-Estate Disclosure

    Real estate disclosures in Washington are governed by Revised Code of Washington (RCW) § 64.06.020. Sellers of improved residential real property must complete and deliver the statutory Real Property Transfer Disclosure Statement (Form 17) to prospective buyers. Section 7 (Environmental) explicitly inquires whether the property has any radon gas, whether testing has occurred, and whether any radon mitigation system exists. Delivering false or incomplete statements, or failing to deliver the disclosure, provides buyers statutory rights of rescission within three business days of receipt.

    Mitigator & Tester Certification

    Washington does not maintain a state licensing board or state certification program for radon measurement or mitigation contractors; there is no Washington state radon license. General contractors must be registered with the Washington State Department of Labor & Industries (L&I). For radon proficiency, the WA DOH Radon Program officially advises consumers to hire contractors credentialed by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

    New Construction

    Radon-resistant construction is enforced under the Washington State Residential Code (WSRC / WAC 51-51), which incorporates International Residential Code Appendix F. Radon-resistant new construction (RRNC) is mandatory across seven designated EPA Zone 1 counties in eastern Washington: Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, and Stevens. In these counties, all new residential construction must incorporate passive sub-slab depressurization systems, including gas-permeable gravel, sealed vapor barriers, sealed perimeter joints, and a rough-in vertical vent pipe through the roof.

    Radon Zones & the Action Level

    Washington displays a dramatic geological divide across the Cascade Mountain Range:

    • Zone 1 (High Potential, predicted average indoor levels > 4.0 pCi/L): Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, and Stevens counties.
    • Zone 2 (Moderate Potential, predicted average 2.0 to 4.0 pCi/L): Chelan, Douglas, Grant, Kittitas, Klickitat, Lincoln, Walla Walla, Whitman, and Yakima counties.
    • Zone 3 (Low Potential, predicted average < 2.0 pCi/L): Puget Sound and western coastal counties, including King, Pierce, Snohomish, Kitsap, Thurston, and Whatcom.

    WA DOH adheres to the EPA action level of 4.0 pCi/L, strongly advising mitigation for living areas testing at or above 4.0 pCi/L. Explore the state breakdown on our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state’s official radon resource is the Washington State Department of Health (WA DOH) — Radon Program (doh.wa.gov/community-and-environment/contaminants/radon). Washington residents can access educational materials, purchase low-cost test kits through state-partnered laboratories, and look up national NRPP/NRSB contractor registries.

    Sources & Limits

    This regulatory guide is prepared for informational purposes only and does not constitute formal legal, building code, or engineering counsel. Building codes and administrative interpretations are subject to revision by the State Building Code Council and WA DOH. Consult local building departments or legal counsel for site-specific requirements.

    Primary Official Sources: Washington State Department of Health (WA DOH); Revised Code of Washington § 64.06.020; Washington State Building Code Council (WAC 51-51 Appendix F); U.S. Environmental Protection Agency (Map of Radon Zones for Washington).

    Return to our national guide on Radon Regulations in the United States or inspect national county risk rankings on the EPA Radon Zone Map.

  • Radon Laws in Florida: Testing, Disclosure & Mitigation Rules

    Radon Laws in Florida: Testing, Disclosure & Mitigation Rules

    The Short Answer

    Florida regulates radon through mandatory institutional facility testing, commercial contractor certification, and statutory contract disclosures under Florida Statutes § 404.056. While testing in private homes is voluntary, Florida law mandates radon testing for public and private K-12 schools, state-licensed day care centers and state-owned/operated/regulated 24-hour care facilities in counties designated Intermediate or Elevated Radon Potential on the Florida Radon Protection Map. Furthermore, Florida requires the statutory radon notification on at least one document executed at or before a sale contract or rental agreement, and mandates that all commercial radon testers, mitigators, and laboratories be certified by the Florida Department of Health (FDOH).

    Testing Requirements

    Florida enforces mandatory testing in designated institutional facilities under Fla. Stat. § 404.056(4). All public and private kindergarten through grade 12 schools, state-licensed child care facilities, day care centers, nursing homes, and 24-hour residential care facilities in designated counties must undergo radon testing within one year of opening and repeat testing every five years. Facility administrators must report test results to FDOH. For private single-family homeowners and standard commercial properties, radon testing is voluntary under state law.

    Real-Estate Disclosure

    Florida law mandates statutory radon disclosure under Fla. Stat. § 404.056(5). Every contract for the sale of residential real property and every residential lease agreement must contain a specific, verbatim notification in conspicuous print explaining the nature of radon gas, noting that levels exceeding federal guidelines have been found in buildings in Florida, and directing parties to the county health department. In addition, under Florida Supreme Court precedent (Johnson v. Davis), sellers have a legal duty to disclose known material latent defects not readily observable by the buyer.

    Mitigator & Tester Certification

    Under Fla. Stat. § 404.056(2) and Florida Administrative Code (F.A.C.) Chapter 64E-5 Part XII, anyone performing radon measurement, mitigation, or laboratory analysis for compensation must be certified by the Florida Department of Health. The department certifies Radon Measurement Specialists, Radon Measurement Technicians, Radon Mitigation Specialists, Radon Mitigation Businesses, and Radon Laboratories. Certified professionals must pass state-approved examinations, complete approved continuing education, follow FDOH measurement protocols, and submit monthly activity reports documenting all Florida projects.

    New Construction

    Radon-resistant construction is addressed through the Florida Building Code (FBC) — Residential, Appendix E (Radon Control Methods). Appendix E provides technical construction standards for passive soil depressurization systems in new residential construction. While Appendix E is not applied as a mandatory statewide requirement across all Florida jurisdictions, local building departments in designated counties with elevated radon potential (such as areas near phosphate mining operations) are authorized to enforce Appendix E standards for new construction.

    Radon Zones & the Action Level

    Florida has an entirely distinct radon profile compared to northern states: there are zero EPA Zone 1 counties in Florida. The state is predominantly classified as EPA Zone 3 (Low Potential, predicted average indoor levels < 2.0 pCi/L). However, a cluster of counties in north-central and central Florida—associated with natural phosphate geological deposits—are classified as Zone 2 (Moderate Potential, 2.0 to 4.0 pCi/L), including Alachua, Citrus, Gilchrist, Hillsborough, Levy, Marion, Polk, and Union counties. FDOH adheres to the EPA action level of 4.0 pCi/L. See county-level details on our EPA Radon Zone Map guide.

    The State’s Radon Program

    The state regulatory program is the Florida Department of Health (FDOH) — Radon and Indoor Air Program (floridahealth.gov/environmental-health/radon/index.html). Property owners can access the certified radon contractor registry, order educational materials, review institutional facility compliance guidelines, or call the FDOH Radon Hotline at (800) 543-8279.

    Sources & Limits

    This regulatory guide is provided for educational and informational purposes only and does not constitute formal legal, building code, or medical advice. Statutory mandates and administrative rules are subject to legislative update. Always confirm specific requirements with the Florida Department of Health or qualified legal counsel.

    Primary Official Sources: Florida Department of Health (FDOH) Radon and Indoor Air Program; Florida Statutes § 404.056; Florida Administrative Code Chapter 64E-5 Part XII; Florida Building Code; U.S. Environmental Protection Agency (Map of Radon Zones for Florida).

    Return to our national guide on Radon Regulations in the United States or inspect national county risk rankings on the EPA Radon Zone Map.