Radon Mitigation Cost: What It Costs and What Changes the Price
The sources we read put the cost of a radon mitigation system between $800 and $3,000. National Radon Program Services at Kansas State University gives a national average of $1,200, with $800 to $1,500 common. The EPA gives no dollar figure. It says most homes can be fixed for about the same cost as other common home repairs. The price depends on the size and design of your home and which radon reduction methods it needs.
Last updated: 2026-10-05 · By the CleanAirHomeLab team
Affiliate disclosure: Amazon product links on this page may earn us a small commission at no cost to you. The quote links to HomeAdvisor, Angi and Thumbtack are plain links. We have no deal with them and earn nothing from them. Our cost figures come from National Radon Program Services, state health departments and the EPA, not from commission rates.
Quick Answer: How Much Does Radon Mitigation Cost?
- National average: $1,200, with $800 to $1,500 common (National Radon Program Services)
- State figures: $1,000 to $2,000 (Wisconsin Department of Health Services). $1,500 to $3,000 (Minnesota Department of Health).
- EPA action level: 4.0 pCi/L. Fix your home at or above this reading.
- Most common system: Active subslab suction, the EPA says
- Best bid practice: Get more than one estimate from NRPP-certified mitigators
The AARST-NRPP directory is the only one of these two that confirms a mitigator is certified. Quote marketplaces match you with local contractors but do not verify NRPP certification, so ask for the certification number yourself. The EPA says it is wise to get more than one estimate.
Radon Reduction Methods by Foundation Type
The method your home needs depends mostly on what kind of foundation you have. The EPA groups radon reduction systems by foundation design. Homes with more than one foundation type may need a combination of methods. None of the sources we read gives a price for each system type, so this table shows the typical radon reduction the EPA lists for each method.
| System Type | Foundation | Typical Radon Reduction (EPA) | Notes |
|---|---|---|---|
| Active subslab suction (subslab depressurization) | Basement or slab on grade | 50 to 99 percent | The most common and usually the most reliable method, the EPA says. A pipe goes through the floor slab and a fan vents the radon outside. |
| Submembrane suction | Crawl space | 50 to 99 percent | A plastic sheet covers the earth floor. A vent pipe and fan draw the radon from under the sheet. |
| Block-wall suction | Basement with hollow block walls | 50 to 99 percent | Often used in combination with subslab suction, the EPA says. |
| Heat recovery ventilator (HRV) | Any | Variable | Limited use, the EPA says. Best applied in limited-space areas like basements. |
| Passive subslab suction | Usually new construction | 30 to 70 percent | No fan. Not as effective as active subslab suction, the EPA says. |
Reduction figures and notes come from the EPA Consumer's Guide to Radon Reduction. The EPA says mitigation costs vary with the technique, the materials, and the extent of the problem. National Radon Program Services says a typical single-family home can be done in one day by a qualified contractor.
Test Before You Mitigate
Do not pay for mitigation until you have a confirmed reading. The EPA says a short-term test stays in your home for 2 to 90 days, depending on the device, and a long-term test stays for more than 90 days. A long-term test is more likely to tell you your year-round average. Every radon test should run for at least 48 hours. The EPA says January is National Radon Action Month.
The EPA steps are simple. Take a short-term test. If the result is 4 pCi/L or higher, take a follow-up test to be sure. Fix your home if a long-term follow-up test reads 4 pCi/L or more, and consider fixing it if the average of two short-term tests is 4 pCi/L or higher. If it reads between 2.0 and 4.0 pCi/L, the EPA recommends that you consider fixing your home. The World Health Organization suggests a national reference level of 100 Bq/m3 in its radon fact sheet. The EPA gives that as 2.7 pCi/L.
For testing equipment picks, see our reviews of the best radon detectors for home use. A mail-in kit is enough for the first reading. A continuous monitor is useful for tracking levels after mitigation.
One more note on testing: place the kit on the lowest lived-in level of the home. The EPA says that is the basement if it is used often, otherwise the first floor. Put it in a room that is used regularly, but not the kitchen or a bathroom. Keep it at least 20 inches above the floor, where it will not be disturbed, and away from drafts, high heat, high humidity, and exterior walls. The EPA testing steps are covered in detail in the Citizen's Guide.
What Drives the Price Up or Down
The EPA says the cost to fix a home can vary widely. Here is what the sources say changes it.
Home design, size, and foundation
National Radon Program Services says the cost may vary with the home's design, size, foundation, construction materials, and the local climate. The EPA says homes with more than one foundation type may need a combination of radon reduction techniques.
Pipe routing and looks
National Radon Program Services says part of the cost can depend on what it takes to conceal the system. A system routed outside the house can reduce radon quite well, but it may not look as good as one routed through an interior closet.
Diagnostic tests
The EPA says many contractors give free estimates, but they may charge for diagnostic tests. These tests help decide which type of system should be used.
Sealing
The EPA says sealing cracks and other openings in the foundation is a basic part of most approaches to radon reduction. It makes other techniques more effective and cost-efficient. The EPA does not recommend sealing alone as a way to reduce radon.
Running costs
The EPA says systems that use fans will slightly increase your electric bill, and that most systems cause some loss of heated or cooled air. National Radon Program Services says the fan uses about as much electricity as a 60 to 90 watt light bulb left on all the time.
Region
State sources give different figures. The Wisconsin Department of Health Services says the average cost for a contractor to install a system is $1,000 to $2,000. The Minnesota Department of Health says costs in general can range from $1,500 to $3,000. Ask your state radon office what is typical where you live.
Radon Fan Models
The fan is the moving part of an active radon system. The EPA says it must run continuously for the system to work. Here are three RadonAway fan models sold on Amazon. Prices move, so check the current one at the retailer.
Radonaway RP145
Specs not on file. Ask your mitigator which fan fits your system.
Radonaway RP265
Specs not on file. Ask your mitigator which fan fits your system.
Radonaway GP501
Specs not on file. Ask your mitigator which fan fits your system.
Heads up: the EPA says a fan may need to be repaired or replaced after five years or more, and that replacing one will cost around $200 to $350 including parts and labor. The EPA recommends a qualified contractor for the system itself. Ask qualified mitigators for estimates before work begins.
How to Hire an NRPP-Certified Mitigator
The EPA names two national radon proficiency programs: the National Radon Proficiency Program (NRPP) and the National Radon Safety Board (NRSB). The EPA also says many states require radon professionals to be licensed, certified, or registered. Pennsylvania, for one, runs its own certification program. Start with your state radon office.
Ask three questions of every bidder:
- What is your NRPP or NRSB certification number? (Look it up on the NRPP directory.)
- What post-mitigation reading do you guarantee in writing? (The EPA checklist asks about a guarantee to reduce radon to 4 pCi/L or below. It says many contractors agree to a lower level, such as 2 pCi/L or less.)
- Is the post-mitigation test included in the bid, or does it cost extra?
The EPA says it is wise to get more than one estimate, to ask for references, and to contact some of those references. It also notes that a less expensive system may cost more to operate and maintain.
These three are ordinary links. We have no referral agreement with any of them and earn nothing if you request a quote. None of them verifies NRPP certification, so check that yourself against the AARST-NRPP directory.
State Radon Programs
Pennsylvania
The state says Pennsylvania has one of the most serious radon problems in the country. An estimated 40 percent of homes tested there have radon levels above 4 pCi/L. The state runs a certification program for radon testing and mitigation. See the PA DEP Radon Division.
Iowa
The state publishes a list and a map of credentialed radon mitigation specialists. It says mitigation is recommended at or above 4 pCi/L, but that the choice should not rest on a single test result. See the Iowa Department of Health and Human Services.
Minnesota
The state says costs in general can range from $1,500 to $3,000. Minnesota requires radon mitigation professionals to be licensed. See the Minnesota Department of Health.
Wisconsin
The state says the average cost for a contractor to install a system is $1,000 to $2,000. It says to hire a contractor who is nationally certified by NRPP or NRSB. See the Wisconsin Department of Health Services.
After Install: Retest and Long-Term Monitoring
The EPA says a post-mitigation radon test should be done within 30 days of installation, but no sooner than 24 hours after the system is running with the fan on. It recommends a two- to seven-day test. The contractor may do this test, but the EPA recommends that you also get an independent follow-up measurement. The EPA says radon levels in most homes can be reduced to 2 pCi/L or below.
Long-term, look at the warning device on your system on a regular basis. The EPA says that is how you make sure the system is working correctly. A continuous monitor can track your level between tests. See the best continuous radon monitors. You can pair one with a whole-home air quality monitor for PM2.5, CO2, and VOCs too.
The EPA also says it is a good idea to retest your home at least every two years to be sure radon levels remain low. Retest after any major remodeling too, the EPA says, to make sure the work did not make the system less effective.
Keep records. If you ever sell the home, the EPA says to tell buyers about the system and give them information on how to run and maintain it. A binder with the original test, install date, fan model, post-mitigation test, and any retests makes that easy.
Common Questions
How much does radon mitigation cost?+
The sources we read give ranges from $800 to $3,000. National Radon Program Services at Kansas State University, which works with the EPA, says the national average is $1,200, with $800 to $1,500 common. The Wisconsin Department of Health Services says the average cost for a contractor to install a system is $1,000 to $2,000. The Minnesota Department of Health says costs in general can range from $1,500 to $3,000. The EPA gives no dollar figure. It says most homes can be fixed for about the same cost as other common home repairs, and that the cost depends on the size and design of your home and which radon reduction methods are needed. Get an estimate from more than one qualified contractor.
How long does a radon mitigation system last?+
The fan is the wear part. The EPA says fans may last for five years or more, and that manufacturer warranties tend not to exceed five years. National Radon Program Services says fan warranties are typically 5 years, with life spans of 10 to 15 years. The EPA says replacing a fan will cost around $200 to $350 including parts and labor. The fan must run all the time for the system to work.
Can I install a radon mitigation system myself?+
The EPA recommends that you have a qualified radon mitigation contractor fix your home. It says lowering high radon levels takes specific technical knowledge and special skills, and that without them you could actually increase your radon level or create other hazards and extra costs. If you decide to do the work yourself, the EPA says to get information on training courses from your state radon office. The EPA names two national radon proficiency programs for professionals: NRPP and NRSB.
What radon level requires mitigation?+
The EPA action level is 4 pCi/L. At or above 4 pCi/L, the EPA recommends fixing your home. The EPA also recommends that you consider fixing your home between 2 and 4 pCi/L. The World Health Organization suggests a national reference level of 100 Bq/m3, which the EPA gives as 2.7 pCi/L. The EPA says outdoor air averages about 0.4 pCi/L and the average indoor level in US homes is about 1.3 pCi/L. The EPA says there is no known safe level of radon. Test before you spend a dollar on mitigation.
Does radon mitigation increase home value?+
The sources we read do not put a dollar value on it. The EPA says that where radon problems have been fixed, home sales have not been blocked or frustrated, and that the added protection is sometimes a good selling point. It also says buyers often ask if a home has been tested and if elevated levels were reduced. Keep your test results and your system paperwork.
How fast does mitigation reduce radon levels?+
The EPA says some radon reduction systems can reduce radon levels in your home by up to 99 percent. Its table lists a typical reduction of 50 to 99 percent for subslab suction. The EPA says to do a follow-up test within 30 days of installation, but no sooner than 24 hours after the system starts running with the fan on. It recommends a two- to seven-day test for this. The EPA says many contractors guarantee that they will adjust the system to reach an agreed radon level.
Is January really National Radon Action Month?+
Yes. The EPA says January is National Radon Action Month. The aim is to increase public awareness of radon, promote radon testing and mitigation, and advance the use of radon-resistant new construction. The EPA says Radon Action Week is the third week in October.
References and Primary Sources
- US EPA, A Citizen's Guide to Radon (PDF), read 2026-10-05. Testing steps, where to place a test kit, average indoor and outdoor levels, and cost in general terms.
- US EPA, Consumer's Guide to Radon Reduction (PDF), read 2026-10-05. Reduction methods by foundation, typical radon reduction, how to pick a contractor, follow-up testing, and fan life.
- US EPA, What is EPA's Action Level for Radon and What Does it Mean?, read 2026-10-05. Fix at 4 pCi/L or more and consider fixing between 2 and 4 pCi/L.
- US EPA, How much can a radon mitigation system cost?, read 2026-10-05. No dollar figure. About the same cost as other common home repairs.
- US EPA, How do I know if my radon mitigation system is working properly?, read 2026-10-05. Fan life, fan replacement at around $200 to $350, and retesting at least every two years.
- US EPA, Find a Radon Test Kit or Measurement and Mitigation Professional, read 2026-10-05. The two national radon proficiency programs, NRPP and NRSB.
- US EPA, What is National Radon Action Month?, read 2026-10-05. January is National Radon Action Month.
- US EPA, Does the 2009 WHO recommendation affect the EPA action level?, read 2026-10-05. The WHO reference level of 100 Bq/m3 is 2.7 pCi/L.
- World Health Organization, Radon fact sheet, read 2026-10-05. National reference level of 100 Bq/m3.
- National Radon Program Services (Kansas State University), Reducing Radon in Your Home, read 2026-10-05. National average cost of $1,200, with $800 to $1,500 common. Fan warranties, fan life, and fan power use.
- Minnesota Department of Health, Radon Mitigation Systems, read 2026-10-05. Costs in general range from $1,500 to $3,000.
- Wisconsin Department of Health Services, Radon Mitigation, read 2026-10-05. Average contractor cost of $1,000 to $2,000.
- National Radon Proficiency Program (NRPP), read 2026-10-05. Certification program for radon professionals.
- National Radon Safety Board (NRSB), read 2026-10-05. Certification program for radon professionals.
- Pennsylvania DEP Radon Division, read 2026-10-05. An estimated 40 percent of homes tested are above 4 pCi/L.
- Iowa Department of Health and Human Services Radon Program, read 2026-10-05. Lists of credentialed mitigation specialists.
Ready to Get Bids?
Confirm certification in the AARST-NRPP directory first, then get three bids so local pricing is visible before you commit.
Affiliate Disclosure: Amazon product links on this page are affiliate links and may earn us a commission at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. The contractor quote services and the AARST-NRPP directory are not monetised: we have no referral agreement with any of them and earn nothing if you request a quote. Cost figures come from National Radon Program Services, state health departments and the EPA. Full disclosure.
Sources and last review
Specifications on this page are taken from the documents below, on the dates shown. We do not physically test products; read our methodology. Page last reviewed .
- US EPA (government), retrieved 2026-09-03