How to Find a Certified Radon Professional in Indiana

Indiana Requires State Licensing

Indiana is one of the states that mandates licensing for radon professionals. You cannot legally test or mitigate radon for compensation in Indiana without a valid credential issued through the Indiana State Department of Health (ISDH). This gives homeowners a concrete verification step before hiring anyone.

Our Indiana directory lists 224 certified radon professionals across the state. The coverage is real, but it is not evenly distributed. Indianapolis and the surrounding metro have the most contractors, while rural southern Indiana has fewer options. Knowing where coverage is strong and where it is thin helps you plan ahead, particularly if you have a real estate transaction deadline.

Browse 224 certified radon professionals in Indiana in our directory.

Indiana's Licensing Requirements

ISDH administers Indiana's radon professional licensing program. All radon testers and mitigators operating for compensation in Indiana must hold a current state license, which requires certification from one of two nationally recognized bodies: the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).

Both programs require passing a written examination, completing approved training, demonstrating hands-on proficiency, and completing continuing education to maintain the credential. ISDH accepts either certification. For homeowners, the practical difference between the two is minimal. What matters is that the professional's credential is current and covers the type of work you need.

The relevant license categories in Indiana are:

RT (Radon Tester): Licensed to perform radon measurement services. This is the credential your inspector should hold for a pre-purchase or diagnostic test.
RMT (Radon Mitigation Technician): Licensed to install and service radon mitigation systems. An RMT typically works under the supervision of an RMS on complex projects.
RMS (Radon Mitigation Specialist): The full mitigation credential. An RMS can independently design, install, and certify mitigation systems. For any mitigation project, you want an RMS leading the work or an RMT supervised by one.

How to Verify an Indiana Radon License

ISDH maintains a list of certified radon professionals on its website at in.gov/health/eph/radon. Before hiring anyone, look up their name or certification number in the ISDH registry to confirm the license is active and covers the type of work you need. Testing and mitigation require separate credentials. A tester's license does not authorize mitigation work.

Verification takes two minutes. Do it before your first call, not after you have received a quote and are ready to schedule.

You can also verify NRPP certification directly at nrpp.info and NRSB certification at the NRSB website. Both registries are publicly searchable by name or certificate number.

Coverage Across Indiana

Indiana's 224 certified professionals are distributed unevenly. Coverage reflects population centers and the volume of radon work those markets generate.

Indianapolis Metro: Most Coverage in the State

The Indianapolis metropolitan area, including Marion, Hamilton, Hendricks, Johnson, Boone, and Hancock counties, has over 100 certified radon professionals. This is the densest coverage in the state by a wide margin. In the Indianapolis metro, you can typically schedule a testing appointment within a few days and a mitigation installation within one to three weeks. Competition keeps pricing close to the Indiana average of $100 to $250 for testing and $800 to $2,000 for mitigation. Getting multiple quotes is straightforward.

Key Indianapolis submarkets with strong coverage include Carmel, Fishers, Noblesville, Greenwood, Avon, Zionsville, Westfield, and Plainfield, as well as the city itself.

Fort Wayne

Allen County and the Fort Wayne metro have solid coverage with multiple ISDH-licensed professionals serving the area. Scheduling a test or mitigation within one to two weeks is realistic for most of the year. During peak real estate season (spring and early summer), plan a bit further ahead. Fort Wayne contractors are accustomed to the market's radon testing volume given the area's consistently elevated levels.

South Bend and Elkhart

St. Joseph and Elkhart counties have good coverage. South Bend, Mishawaka, and Elkhart have licensed professionals serving the local market. Given northern Indiana's high radon rates, demand for testing services in this region is consistent, and contractors are experienced with the local geology.

Bloomington and the Karst Belt

Monroe County (Bloomington) has coverage from several licensed professionals. However, Bloomington's karst geology creates cases where a standard mitigation approach may require modification. Ask specifically whether the contractor has experience with karst-related radon in southern Indiana. A contractor who has only worked in glacial till terrain may not be familiar with the fracture-migration patterns that characterize Monroe, Lawrence, and adjacent counties. Lawrence County (Bedford) and Orange County have more limited coverage; book in advance.

Terre Haute and Lafayette

Vigo County (Terre Haute) and Tippecanoe County (Lafayette, West Lafayette) have licensed professionals serving the market, though options are narrower than in the Indianapolis metro. For both areas, booking one to two weeks in advance is a reasonable target. Travel fees are uncommon within these markets but can appear if a professional is traveling from Indianapolis.

Rural Southern Indiana

Crawford County, Perry County, Martin County, Daviess County, and the smaller rural counties of the unglaciated south have limited radon professional coverage. If you own property in these areas, expect that the nearest licensed professional may be 30 to 60 miles away. Travel fees may apply. For real estate transactions in rural southern Indiana, contact professionals in Bedford, Bloomington, or Evansville and ask about service area coverage before assuming they can reach your location on your timeline.

Questions to Ask Before Hiring

Once you have a list of candidates from the ISDH registry or our directory, these questions separate qualified professionals from those who cut corners.

Licensing and Insurance

What is your ISDH license number? Verify it on the ISDH certified professional list before the conversation proceeds. Any legitimate professional provides this without hesitation.
Do you carry general liability insurance? General liability covers property damage during the job. Ask for a certificate of insurance, not just a verbal yes. Errors and omissions coverage is a further indicator of a professional operation.
Are you certified by NRPP or NRSB? Get the specific certification number. You can verify it independently in addition to the ISDH registry check.

Equipment and Process

What equipment do you use for testing? Continuous Radon Monitors (CRMs) produce hour-by-hour readings and a full data log for the test period. For real estate transactions, CRM data provides documentation that test conditions (closed house, no tampering) were maintained throughout. Electret ion chambers and charcoal canisters are also valid EPA-approved methods, but ask what the contractor uses and why.
What fan brands do you install for mitigation? Established manufacturers including RadonAway, Festa, and Fantech are standard in the industry. A contractor should be able to explain why a particular fan model suits your home's foundation configuration and soil conditions.
Do you pull required permits? Many Indiana municipalities require a permit for radon mitigation system installation. Ask before the job starts. A contractor who skips permits creates potential issues when you sell the home, since permit records are typically checked during real estate transactions.

After the Installation

Is a post-installation test included? A post-mitigation test confirms the system actually reduced radon below 4 pCi/L. Any contractor who considers the job complete without a post-installation test is not following proper practice. This is non-negotiable.
What warranty do you offer? A standard warranty covers the fan and labor for one to two years. Fan manufacturers typically offer longer coverage on the equipment itself. Get the warranty terms in writing and confirm it specifies the radon level the system is expected to achieve.
Will you provide documentation I can share with a future buyer? Post-mitigation test results, the installation date, contractor name and license number, and system specifications all belong in your home file. A professional mitigator should provide written documentation as part of the job.

Red Flags in Indiana's Radon Market

No ISDH License

Operating without an ISDH license is illegal in Indiana. It also means the contractor has not demonstrated minimum competency to any state program and carries no accountability to ISDH's oversight process. Verify the license in the ISDH registry before anything else. If the name does not appear or the license is expired, stop the conversation.

Testing and Mitigation from the Same Company on the Same Job

For real estate transactions, having the same company perform the initial test and recommend and install mitigation creates a conflict of interest. A company that stands to earn $1,500 from a mitigation job has a financial stake in what the test result shows. Industry protocols from AARST address this. For a home you already own and are testing for your own information, this is a lesser concern, but remain aware of the dynamic.

No Post-Installation Test

Mitigation reduces radon in most homes, but the amount of reduction depends on system design, fan sizing, and installation quality. A contractor who marks the job complete without measuring the result is either cutting corners or lacks the competency to stand behind the work. The post-test is the proof the system worked. Require it in writing before the job starts.

Vague Lifetime Guarantees

Some contractors advertise “lifetime guarantees” on mitigation systems. Before letting this influence your decision, ask what the guarantee actually covers: parts, labor, or both; what radon level the system is guaranteed to achieve; and how a claim is processed. A guarantee that specifies nothing is a marketing phrase, not a commitment.

Pressure to Decide Immediately

A contractor who creates urgency to sign before you have had time to verify their license, compare quotes, or review the written proposal is a red flag. Legitimate Indiana radon professionals are in demand and do not need to pressure homeowners into immediate decisions.

Typical Costs in Indiana in 2026

Having a benchmark helps you evaluate quotes before committing.

Radon testing: $100 to $250 for professional short-term testing (48 to 96 hours). Long-term tests (90 days or more) provide more reliable data for non-transactional decisions and cost somewhat more.
Radon mitigation: $800 to $2,000 for a standard sub-slab depressurization system. Single-pipe installations in straightforward slab or basement foundations are at the lower end. Multiple suction points, crawl space work, or complex foundation types push costs higher.
Rural premium: If a contractor travels more than 30 to 40 miles to reach your location in rural southern or northern Indiana, expect a travel fee in the range of $75 to $150 added to the base cost.

Getting two or three quotes is practical in the Indianapolis metro and other areas with multiple contractors. In rural areas or smaller markets, your options may be narrower, but even a single detailed written quote gives you a basis for evaluating whether the proposed scope of work is appropriate.

Start With the Directory

Our Indiana directory lists 224 ISDH-certified radon professionals organized by location. Search by city or county to find licensed testers and mitigators serving your area, with direct contact information and credential details.

Browse 224 certified radon professionals in Indiana and find someone serving your area today.

Frequently Asked Questions

Does Indiana require a license to test or mitigate radon?

Yes. Indiana law requires all radon testers and mitigators operating for compensation to hold a current license through the Indiana State Department of Health (ISDH), based on certification from NRPP or NRSB. You can verify any professional's license on the ISDH certified professional list at in.gov/health/eph/radon.

What is the difference between an RT, RMT, and RMS?

RT (Radon Tester) is licensed to perform radon measurement. RMT (Radon Mitigation Technician) is licensed to install mitigation systems, typically under RMS supervision. RMS (Radon Mitigation Specialist) holds the full mitigation credential and can independently design and certify systems. For a diagnostic or real estate test, you need an RT. For mitigation, you want an RMS leading the job.

How much does radon mitigation cost in Indiana?

Standard sub-slab depressurization systems in Indiana typically cost $800 to $2,000. Straightforward basement or slab installations are at the lower end. Multiple suction points, crawl spaces, or complex foundations can push costs higher. Professional testing runs $100 to $250. Rural areas may include a travel fee if the nearest licensed contractor is more than 30 to 40 miles away.

How do I find a radon professional in rural southern Indiana?

Coverage in rural southern Indiana counties, including Crawford, Perry, Martin, and Daviess counties, is limited. The nearest licensed professional may be 30 to 60 miles away in Bedford, Bloomington, or Evansville. Contact professionals in these larger markets and confirm their service area covers your location before assuming availability. For real estate transactions, start searching early.

What should a complete radon mitigation job include in Indiana?

A complete mitigation job should include a written quote with itemized materials and labor, permits pulled where required by your municipality, installation of a sub-slab depressurization system with an appropriate fan, and a post-installation radon test confirming the system reduced levels below 4 pCi/L. The contractor should provide written documentation of the installation and a warranty covering at least the fan and labor for one to two years.