About Radon Test Index

Radon Test Index is an independent public directory compiled by Shortell Designs. It lists people who already appear on official state certification lists and on EPA-recognized national proficiency listings. It is a reading of those records, not a new credential.

What this is not

• Not a laboratory and not a radon testing or mitigation company.
• Not endorsed by the U.S. Environmental Protection Agency, NRPP, NRSB, or any state radon office.
• Not a ranking, marketplace, or referral desk. There is no paid placement on the professional lists.

Affiliate disclosure

• DIY kit links on the how-to page are Amazon Associates Special Links. As an Amazon Associate, Shortell Designs earns from qualifying purchases.
• The home and how-to pages also link to the Sun Radon lüft monitor through a Sun Radon affiliate link. Shortell Designs may earn a commission from Sun Radon at no extra cost to you.
• Affiliate links never affect who appears on the professional lists.

Verify before you hire

Licenses expire and lists go stale. Before you hire anyone, confirm a current credential with the issuing program:

• NRPP Find a Pro (EPA-recognized national proficiency)
• NRSB (EPA-recognized national proficiency)
• Iowa: HHS radon program and AMANDA license search
• Pennsylvania: DEP Radon Services Directory
• Ohio: ODH hire a professional (an NRPP/NRSB listing is not an Ohio license)
• Minnesota: MDH licensed service providers
• North Dakota: DEQ personnel list (PDF)
• Colorado: DORA Office of Radon Professionals and license lookup
• Illinois: IEMA-OHS active licensee listing
• New York: NYS DOH certified testers and mitigation contractors
• Kansas: KDHE radon professionals and certified technician list (PDF, 2026-07-14)
• Nebraska: DHHS radon program licensed measurement and mitigation business PDFs
• Indiana: IPLA license verification (Profession: Radon, Status: Active) and IDOH Lead & Healthy Homes radon contractors
• Montana: DEQ Radon Control Program and Radon Service Providers map (no state license; DEQ convenience list of NRPP/NRSB providers)
• South Dakota: DANR Air Quality Radon (no state license; no public roster — use NRPP/NRSB)
• Wisconsin: DHS How to Find a Contractor (no state license; no public roster — use NRPP/NRSB)
• Missouri: DHSS radon (no public contractor roster — use NRPP/NRSB)
• Connecticut: CT DPH Radon Program (no state license; nationally certified lists)
• Massachusetts: MA DPH Radon and nationally certified measurement / mitigation lists (no state license; NRPP/NRSB republished monthly)
• Kentucky: Kentucky Board of Radon Safety (no downloadable contractor roster on the board site — use NRPP/NRSB; contact the board to verify a registrant)
• Rhode Island: RIDOH Find radon licensees
• Tennessee: TDEC Radon Program (no state license; no public roster — use NRPP/NRSB)
• West Virginia: OEHS RTIA Licensing Search
• Delaware: DHSS Indoor Radon and voluntary service company list (PDF) (no state certification; voluntary list Rev.7/19 — also use NRPP/NRSB)
• Virginia: DPOR Regulant Lists (Class A/B/C contractors with RMC specialty) and VDH Indoor Radon Program (NRPP/NRSB required for professionals; RMC is the contractor specialty roster)
• Maryland: MDE Radon Safety and MDH Radon (no public certified-business roster — use NRPP/NRSB)
• Utah: DOPL Construction Business Registry (S354 Radon Mitigation; Active + opted-in only), DOPL License Lookup, and DEQ Radon Program (contractor license + NRPP required for mitigation — also use NRPP/NRSB)
• California: CDPH Certified Radon Services Providers (state listing required; NRPP or NRSB plus CDPH submission; mitigators also need CSLB)
• Oregon: OHA Certified Radon Measurement Companies and OHA Certified Radon Mitigation Companies (companies in Oregon with NRPP/NRSB-certified staff; OHA informational lists, not a separate state license)
• Nevada: UNR Extension NREP Certified Radon Testers and UNR Extension NREP Certified Radon Mitigation Contractors (EPA-funded Nevada Radon Education Program compiles NRPP/NRSB-certified professionals; not a separate state radon license roster)
• Washington: DOH Radon (no state license; no public roster — use NRPP/NRSB)
• Idaho: DHW What is Radon? (no state license roster; no public company roster — use NRPP/NRSB)
• New Hampshire: DHHS Radon Program and OPLC Airborne Radon Mitigation Certification (no public DHHS company roster; airborne mitigation installers must hold NRPP or NRSB per RSA 310-A:189-a)
• Michigan: EGLE Radon Measurement and Mitigation Contractors (no state license; no public company roster — use NRPP/NRSB)

EPA consumer page on finding a qualified provider: How can you find a qualified radon service provider in your area?

Where the names come from

Retrieved 2026-08-29 unless noted. Iowa (265) from HHS certified measurement and credentialed mitigation specialist PDFs generated 2026-07-16. Pennsylvania (724) from DEP tester and mitigator directories dated 2026-08-03; the DEP demo account was omitted. Ohio (8) from individual NRPP listings that publish an Ohio location. Ohio official licensee list is only available as a JavaScript map; this index does not invent names to fill that gap. Minnesota (367) from the MDH statewide licensed service-provider search. North Dakota (44) from the DEQ personnel PDF updated 2025-09-09. Colorado (668) from DORA active RME and RMT licenses in the Colorado Information Marketplace. Illinois (596) from the IEMA-OHS Radon Active Licensee Listing. New York (95) from the NYS DOH certified testers and mitigation contractors pages revised May 2026 (NYS does not issue a state radon license). Kansas (237) from the KDHE certified measurement and mitigation technician PDF dated 2026-07-14 (retrieved 2026-09-01). Nebraska (114) from DHHS licensed measurement (2026-07-28) and mitigation (2026-05-21) business PDFs (retrieved 2026-09-01). Indiana (321) from the IPLA public Active Radon license search (Primary/Secondary Testers and Mitigators; retrieved 2026-09-02). Montana (32) from the DEQ Radon Service Providers GIS FeatureServer table (retrieved 2026-09-03); Montana has no state radon license — DEQ publishes a mitigation-oriented convenience list of nationally certified providers. South Dakota has no state license and no official roster; the South Dakota page is an explainer that links DANR, NRPP, and NRSB only (retrieved 2026-09-04). Wisconsin has no state license and no official roster; the Wisconsin page is an explainer that links DHS, NRPP, and NRSB only (retrieved 2026-09-05). Missouri has no public DHSS radon contractor roster; the Missouri page is an explainer that links DHSS, NRPP, and NRSB only (retrieved 2026-09-06). Connecticut (92) from CT DPH nationally certified measurement and mitigation PDFs dated 3-31-2025 (updated April 4, 2025; retrieved 2026-09-07); CT does not issue a state radon license. Massachusetts (80) from MA DPH nationally certified measurement and mitigation PDFs updated 07/08/2026 (retrieved 2026-09-08); MA does not issue a state radon license. Kentucky Board of Radon Safety publishes no downloadable measurement/mitigation roster on radon.ky.gov; the Kentucky page is an explainer that links the board, NRPP, and NRSB only (retrieved 2026-09-10). Rhode Island (31) from RIDOH licensed testing businesses and mitigation contractors (retrieved 2026-09-11). Tennessee has no state license and no official roster; the Tennessee page is an explainer that links TDEC, NRPP, and NRSB only (retrieved 2026-09-12). West Virginia (139 license rows) from the OEHS RTIA public license search (retrieved 2026-09-13). Delaware (13) from the DHSS voluntary radon service company PDF Rev.7/19 (retrieved 2026-09-14); Delaware does not certify radon contractors. Virginia (32) from DPOR Board for Contractors Class A/B/C regulant lists with RMC (radon mitigation) specialty (lists updated 2026-09-14; retrieved 2026-09-15); VDH also requires NRPP/NRSB for testers and mitigators. Maryland MDE and MDH publish no current downloadable statewide certified-business roster; the Maryland page is an explainer that links MDE, MDH, NRPP, and NRSB only (retrieved 2026-09-19). Utah (20) from the DOPL Construction Business Registry Active opted-in search for Contractor classification S354 Radon Mitigation (retrieved 2026-09-20); incomplete vs all licensed mitigators — re-check DOPL license lookup and NRPP/NRSB. California (243 provider rows: 231 testers · 12 mitigators) from the CDPH Certified Radon Services Providers tables (retrieved 2026-09-24). Oregon (48 company rows: 36 measurement · 12 mitigation) from the OHA certified measurement and mitigation company pages (retrieved 2026-09-25); listing reflects NRPP/NRSB staff certification criteria as published by OHA. Nevada (32 professional rows: 25 measurement · 7 mitigation) from the University of Nevada, Reno Extension Nevada Radon Education Program certified tester and mitigation contractor pages (retrieved 2026-09-26); Nevada does not appear to issue a separate state radon license roster. Washington DOH publishes no public measurement/mitigation roster; the Washington page is an explainer that links DOH, NRPP, and NRSB only (retrieved 2026-10-01). Idaho DHW publishes no public measurement/mitigation roster; the Idaho page is an explainer that links DHW, NRPP, and NRSB only (retrieved 2026-10-02). New Hampshire DHHS publishes no public measurement/mitigation company roster; OPLC requires NRPP or NRSB for airborne mitigation installers (RSA 310-A:189-a); the New Hampshire page is an explainer that links DHHS, OPLC, NRPP, and NRSB only (retrieved 2026-10-03). Michigan does not license or regulate radon contractors and EGLE publishes no public measurement/mitigation company roster; the Michigan page is an explainer that links EGLE, NRPP, and NRSB only (retrieved 2026-10-05).

People who appear on both a measurement list and a mitigation list are marked as both. Phone numbers from the source lists are not republished here.

Contact

Questions about the compilation: Shortell Designs. For licensing questions, use the state radon office or NRPP/NRSB, not this index.