What Is a Radon Mitigator? Indiana License Requirements Explained
March 2, 2026
In Indiana, anyone performing radon testing or mitigation for compensation must hold an active license from the Indiana Professional Licensing Agency (IPLA). This is not optional — it is a legal requirement under Indiana’s radon regulations (410 IAC 5.1).
The Four Indiana Radon License Types
Indiana issues four types of radon professional licenses through IPLA:
Radon Mitigator Licensed to design, install, and service radon mitigation systems in Indiana homes and buildings. This is the license you need when hiring someone to reduce your radon levels. Mitigators can also perform measurements to assess system performance.
Primary Radon Tester Licensed to perform radon measurements using any approved method. Primary testers have completed the full training and examination requirements. They can provide certified measurements for real estate transactions.
Secondary Radon Tester Licensed to perform radon measurements under the supervision of a Primary Radon Tester or Mitigator. Secondary testers have more limited independent authority.
Radon Laboratory Tester Licensed to analyze radon samples in a laboratory setting. These are the labs that process the canisters from field measurements.
How Indiana Radon Licensing Works
Indiana radon licensing is managed by IPLA in cooperation with the Indiana State Department of Health (ISDH). The requirements include:
- Passing an approved national certification exam (through NRPP or NRSB)
- Completing state-required continuing education
- Renewing the license on IPLA’s renewal schedule
- Maintaining compliance with Indiana’s Radon Rule (410 IAC 5.1)
License status (Active, Expired, Inactive) and expiration dates are maintained in the IPLA database, which is publicly searchable at mylicense.in.gov.
Why Licensing Matters
Legal compliance. Indiana law prohibits unlicensed radon work for compensation. If something goes wrong with an unlicensed installation, you have limited legal recourse.
Real estate transactions. Certified radon measurements performed by licensed Indiana testers carry more weight in purchase negotiations. Many buyers’ agents and real estate attorneys specifically request licensed tester results.
Insurance and warranties. Some homeowner insurance policies and home warranties involve radon provisions. Work performed by an unlicensed contractor may not qualify.
System quality. IPLA licensing requires demonstrated knowledge of Indiana’s radon mitigation standards. A licensed mitigator has passed an examination on proper system design, installation, and verification testing.
National Certifications vs. Indiana State License
You may see contractors mention NRPP (National Radon Proficiency Program) or NRSB (National Radon Safety Board) certifications. These are national voluntary programs with their own training and testing requirements.
For Indiana work, the Indiana IPLA state license is the legal requirement. National certifications are a positive signal of additional training and competency, but they do not substitute for the Indiana state license.
Some contractors hold both — the national certification and the Indiana state license. The IN Radon Pros directory flags national certifications on contractor profiles where that data is available.
How to Verify a License Before You Hire
Every contractor profile on this site shows:
- IPLA license number
- License type
- Current status
- Expiration date
You can verify any of these independently at the IPLA verification portal. Search by the contractor’s name or license number. It takes about 30 seconds and takes the guesswork out of the hiring decision.
If a contractor cannot provide their Indiana license number, do not hire them.
Frequently Asked Questions
Is it illegal to do radon mitigation without a license in Indiana?
Yes. Indiana law requires anyone performing radon mitigation or testing for compensation to hold an active IPLA license. Hiring an unlicensed contractor may result in substandard work, no legal recourse, and a mitigation system that does not satisfy home sale requirements.
How do I verify a radon contractor's Indiana license?
Search the contractor's name or license number at mylicense.in.gov/everification. Every profile on IN Radon Pros shows the IPLA license number — you can verify it independently in about 30 seconds.
What is the difference between NRPP certification and an Indiana state license?
NRPP (National Radon Proficiency Program) is a national voluntary certification. An Indiana state license issued through IPLA is required by Indiana law. Some contractors hold both. For Indiana work, the state license is the legal requirement — NRPP certification is a positive indicator of additional training but does not substitute for the Indiana license.