Radon Mitigation in Indianapolis
Indiana requires a state license on top of a national certification for anyone installing radon systems. Here's how to check an Indianapolis installer and judge the finished job.
What IDOH says about fixing radon
IDOH says any radon level carries some risk, and that it's "highly recommended" that homes testing at or above 4 pCi/L install a mitigation system.1 Its brochure points out that high radon can show up in any home, old or new, drafty or sealed, with or without a basement.1 EPA places Marion County in Zone 1.2
Indiana's license rule
Under the Indiana radon rule, 410 IAC 5.1, everyone testing, analyzing or mitigating radon in Indiana homes must be certified by IDOH.3 Since a 2020 rule change, each license also requires an active certification from one of two national bodies, the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB), kept current for as long as the license lasts.45
Installs systems
Radon mitigator
Alters a building to reduce radon. Must be a full-time employee or employer responsible for all the company's mitigation work.4
Tests with monitors
Primary tester
May use active monitors and electret chambers as well as passive kits.4
IDOH links to the state's professional licensing search so you can confirm a license before signing.3
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Get my free referralTakes under a minuteIDOH's questions to ask before you hire
- Will a licensed Indiana radon mitigator install the system?1
- Will diagnostics be done to pick the pipe location and fan size?1
- Are permits needed, and who pulls them? Who handles any licensed electrical work?1
- Is there a written contract, and a warranty on materials and workmanship? For how long?1
- Will they guarantee levels below the EPA action level, and what happens if they don't get there?1
- Is the quoted price guaranteed, and can they give references?1
What a finished system should look like
IDOH's brochure describes a U-tube manometer installed with every system: a "J" shape in the liquid means the fan is pulling, a level "U" means it isn't. The discharge should end at least 10 feet above ground, at least 10 feet from windows, doors and openings, and above the edge of the roof.1
Building new in Hamilton or Hendricks County?
Indiana doesn't require radon-resistant new construction, though IDOH recommends it, and some builders offer a passive pipe with an option to add a fan.1 Ask before closing, since adding it during construction is far easier than later.
Areas we serve
We match homeowners across the Indianapolis area, including these communities and ZIP codes:
- Indianapolis46113 · 46183 · 46201 · 46202 · 46203 · 46204 · 46205 · 46206 · 46208 · 46214 · 46217 · 46218 · 46219 · 46220 · 46221 · 46222 · 46224 · 46225 · 46226 · 46227 · 46228 · 46229 · 46231 · 46234 · 46235 · 46237 · 46239 · 46240 · 46241 · 46250 · 46254 · 46256 · 46259 · 46260 · 46268 · 46278
- Lawrence46216 · 46226 · 46235 · 46236
- Beech Grove46107
- Speedway46222 · 46224
- Carmel46032 · 46033 · 46280 · 46290
- Fishers46037 · 46038
- Noblesville46060 · 46062
- Westfield46074
- Zionsville46075 · 46077
- Greenwood46142 · 46143
- Plainfield46168 · 46231
- Avon46123
- Brownsburg46112
ZIP codes are 2020 Census ZIP Code Tabulation Areas, which closely approximate USPS ZIP codes. We list ZIPs that make up a substantial share of each community, so edge ZIPs that barely touch a town are left out, and some ZIPs span two towns.6 Not on the list? Send the form anyway, and we'll tell you if we can help.
Common questions
Does a radon mitigation company need a license in Indiana?
Yes. Under 410 IAC 5.1, radon mitigation in Indiana homes requires an IDOH license, and the license requires an active NRPP or NRSB national certification.
Can my Indianapolis radon installer also do the follow-up test?
IDOH's licensing instructions say a radon mitigator may not perform tester functions, so the post-mitigation test should come from a licensed tester or your own kit.
How do I know my radon fan is working?
IDOH says every system should have a U-tube manometer. A J-shaped liquid level means the fan is working; a level U shape means it isn't.
Does Indiana require radon systems in new homes?
No. IDOH recommends radon-resistant new construction but Indiana doesn't require it.
Where should the radon pipe vent?
IDOH says at least 10 feet above ground, at least 10 feet from windows, doors and other openings, and above the edge of the roof.
Please note: Indiana requires an Indiana Department of Health license to test or mitigate radon in homes. This page is general information summarized from public agencies, not professional advice. For advice about your home, talk with an IDOH-licensed radon professional.
Sources
- Indiana Department of Health (IDOH), "Radon: A brief guide on how to keep your home and family safe from radon" (PDF, updated Feb. 2026)
- U.S. EPA, "EPA Map of Radon Zones"
- IDOH Lead & Healthy Homes Division, "Indiana Certified Radon Testers and Mitigators"
- IDOH, "Indiana Radon Licensing Instructions" (PDF, April 2026)
- IDOH Lead & Healthy Homes Division, "Radon Information: Contractors"
- U.S. Census Bureau, 2020 ZCTA-to-place and ZCTA-to-county-subdivision relationship files