How Much Does Radon Mitigation Cost?

$733 – $1,490

A radon mitigation system costs between $733 and $1,490 on average with most homeowners spending about $1,112. Depending on the home's design and foundation size, a complex radon reduction system can cost $2,500 or more. Professional radon level testing costs $150 per inspection on average. Get free estimates from radon mitigation companies near you.

Radon Mitigation Costs

A radon mitigation system costs between $733 and $1,490 on average with most homeowners spending about $1,112. Depending on the home's design and foundation size, a complex radon reduction system can cost $2,500 or more. Professional radon level testing costs $150 per inspection on average.

Radon Mitigation Cost
National Average Cost $1,112
Minimum Cost $500
Maximum Cost $4,700
Average Range $733 to $1,490

Table Of Contents

  1. Radon Mitigation Costs
  2. Radon Remediation System Costs
  3. Radon Testing & Inspection Costs
  4. Radon Levels by Zip Code & State
  5. Radon Mitigation System Costs By Type
  6. Radon Water Mitigation Costs
  7. Radon Monitors and Smart Devices
  8. Frequently Asked Questions
  9. Hiring a Radon Mitigation Professional
  10. Radon Mitigation Companies Near Me

Radon Remediation System Costs

Radon remediation cost ranges from $500 to $2,500 for a gas extraction system and between $1,000 and $4,700 for a water treatment solution. For a complete solution, most homeowners spend about $2,000 for radon removal. Radon gas itself produces dust particles as it decays which, if inhaled, can also cause lung cancer. Radon remediation is the process to reduce indoor radon contamination issues and is carried out by professionals.

Radon Remediation System Costs
System Method Cost
Gas extraction systems Extraction systems transfer the radon gas from under your home to the air above your roof. Can range from $500 to $2,500, depending on the type of foundation.
Water treatment solution Granular activated carbon (GAC) filters, or aeration devices are placed between the water mains supply and your home. $1,000 to $4,700, with GAC filters being the cheaper of the two.
With modern testing devices and processes to eliminate the seepage, all homes’ radon gas levels are fixable, with most homes fixed within one day.

Radon Mitigation System Diagram

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Radon Testing & Inspection Costs

Across the nation, about 6% of homes have concentrated levels of radon, and the detection process begins with testing which costs between $20 and $200. A home radon test kit costs less than $20, whereas professional radon level testing costs $150 per inspection on average.

  • Home Radon Test Kit – This is a passive, short-term test that costs less than $20 from hardware stores and will deliver quick results. This simplified solution works by leaving the radon sampler in an open area in the lowest part of the home for 2–4 days and then mailing off the unit to be tested, with the results e-mailed within 72 hours.
  • Ongoing Radon Detectors – This is a long-term test which gives a better picture of radon gas in your home as a year-round average. Radon detectors cost $90 and require a power source to deliver continuous testing. This product will continuously sample the air for radon and can include features like showing you the radon level averages for the previous seven days, as well as an audible alarm if the levels rise above the EPA’s safe radon levels of 4 pCi/l.
  • Professional Radon Level Testing & Inspection – A professional radon mitigation specialist will detect the levels of radon quickly with a thorough radon inspection. The average radon inspection costs $100 to $200 with most homeowners paying about $150. Look for one certified with the American Association of Radon Scientists and Technologists (AARST) and a member of the National Radon Proficiency Program (NRPP) through the National Environmental Health Association.
  • Radon Water Testing Kit – The price of a radon water testing kit varies between $47 and $200, depending on their features. Typically, it costs $7.50 for the test and $40 for the lab testing.

Radon Test Results

Based on current data, while a large number of states in the US don’t register what would be considered dangerous levels of radon, the Environmental Protection Agency recommends all homes be tested for the presence of radon. Because you cannot see it, smell it, or taste it without the right equipment, you would never know it is in a home, hence their recommendation for a radon inspection. Radon in the air is more of a health risk than radon in the water.

Safe radon levels fall below 2.0 pCi/L, with the average normal level in a home being 1.3 pCi/L.

“The DEP and the Environmental Protection Agency (EPA) both recommend that you take action to mitigate your home if your test results indicate radon levels of 4.0 pCi/L of radon or more.” — State of New Jersey DEP

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Radon Levels by Zip Code & State

In the US, the highest concentration of radon levels has been measured in Iowa and the Appalachian Mountains in Pennsylvania. However, each home in the US could have a vastly different amount of radon in it, regardless of where it is.

EPA Radon Levels & Zones Map - Chart By Zip Code, County, City, and State

You can find an interactive map on the Environmental Protection Agency’s website detailing the levels detected for each state, broken down by counties into three different zones.

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Radon Mitigation System Costs By Type

The cost of a radon mitigation system ranges from $500 to $4,700 with most homeowners spending between $700 and $1,500. Radon mitigation professionals can reduce indoor radon gas contamination issues in the air and the water system in your home with many different methods.

Radon Removal Cost by Foundation Type
Reduction System Method Radon Mitigation Cost
- Sub-slab depressurization
- Sub-slab suction
- Soil suction
- Active soil depressurization (ASD)
Vent pipe system that suctions and vents radon gas from beneath a home to the outside of the house. Can range from $500 to $2,500, depending on the type of foundation.
Drain-tile suction Perforated pipes called drain tiles pull radon from the surrounding soil and vent it away from the house. $700–$1,500 for an exterior drain system and exhaust fan and water-filled trap
Sealed sump pump hole systems Much like ASD, an airtight cap is placed on the sump hole to improve suction power. $800–$2,500 for a sump pump system
Sub-membrane depressurization (SMD) Cover exposed earth in crawl spaces, basements, or under manufactured homes with plastic sheeting and vent radon gas to the outside of the house. $100–$500
Seal gas entry Seal and caulk all large cracks and openings. $50–$1,000

Foundation repair $5–$15,000

Best Radon Removal Systems

According to Dr. Tom Greiner at the EPA, State of Iowa, Dept of Public Health, the following radon mitigation methods are the most effective at lowering your radon gas levels in the home [3]:

  1. Sub-slab suction or depressurization Up to 99+%, less if passive
  2. Block-wall ventilation Up to 99+%
  3. Drain-tile suction Up to 99+%
  4. Sub-membrane depressurization (SMD) Site-specific, less if passive
  5. House (basement) pressurization Up to 90%

Radon Mitigation System Well Depressurization With Fan Pump

How To Get Rid Of Radon

Reducing radon gas in the home usually requires a four-pronged attack with different radon remediation systems. Let's go over each step to get rid of radon in your home.

  1. Vent Radon Gas Away from the Soil Under the Home
  2. Vent Radon Out of the Walls and Prevent Its Entry
  3. Vent Radon Out of Rooms and Prevent Its Entry
  4. Filter or Vent Out Radon in Water
Be sure to have a loud or visible warning system installed to alert you if any of the active systems stop working correctly.

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Radon Removal Cost by Foundation Type

The first type of radon reduction system we will cover is to vent radon gas away from the soil from under the home. Depending on the type of your foundation, this method can range from $500 to $2,500 for remediation.

Active Sub-Slab Depressurization System Costs

Active sub-slab systems, also called depressurization systems or soil suction, costs between $500 and $2,500. This is the most popular method of radon mitigation. According to the EPA, this "system is designed to achieve lower sub-slab air pressure relative to indoor air pressure by use of a fan-powered vent drawing air from beneath the slab."

A hole is drilled through the slab to the soil, into which a PVC pipe is installed. An extraction fan is then mounted to it, and both fan and pipes are sealed. The vent pipe then continues to the exit point, where it remains to a postion above the roofline before opening. Passive Sub-Slab Suction or Depressurization (PSSD) is when the vents and pipes are in place, but no section fan is at work.

Drain-Tile Suction

Drain tile suction systems cost between $700 and $1,500 for an exterior drain system and $800 to $2,500 for a sump pump system.

Pipes for water drainage are often installed around the foundation when the house is built, and these can fill with radon gas and then enter the home. Many homes will need to have these pipes installed if not present, or an open or incomplete loop of drains completed and closed. A vacuum is applied to this drainage area and, with the help of a sump pump, is extracted and vented to a point above the roofline before opening.

Sealed Sump Pump Hole Systems

On average, it costs $800 to $2,500 to install a sump pump system. Much like ASD, but an airtight cap is placed on the sump hole to improve suction power.

Sub-Membrane Depressurization (SMD)

Sub-Membrane Depressurization Systems cost between $500 and $2,500 to install. The exposed earth in crawl spaces, basements, or under manufactured homes is covered with an impermeable membrane like airtight poly vapor barrier.

The plastic is caulked to the wall. Ventilation piping is installed through the membrane into the soil which then vents radon gas to the outside of the home with the help of an extraction fan in the attic.

A full crawl space encapsulation costs $1,500 to $15,000 for a drainage system, insulation, vapor barrier, repairs, sealing, and dehumidifier.

Foundation Sealing and Caulking

Properly sealing gas entry costs less than $100 if cracks are small, but large foundation repairs cost between $5,000 and $15,000. Gas sealing starts by injecting foundation cracks with polyurethane foam or seal with flexible caulk.

Then, expansion control joints and floor-to-wall joints are sealed with a compound like ElastiPoxy Crack & Joint Filler. Next, all plumbing pipe entry points are sealing, and the sump pump is covered with an airtight cover and caulk.

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Radon Reduction System Costs - Walls & Entry Prevention

The next type of reduction systems it to vent radon out of the walls and prevent its entry into the home.

Radon Reduction System Costs
Reduction System Method Radon Mitigation Cost
- Block-wall ventilation
- Wall suction
- Block-wall depressurization
Ventilator draws radon from the spaces within basement concrete block walls before it can enter the house. $1,500–$2,500

$2,000+ for a baseboard collection system
Above slab air-pressure differential barrier technology (ASAPDB) A small blower extracts and vents radon gas from drywall cavities and ductwork to the outside of the home. $250–$1,000

The Dangers Of Radon - Diagram For Mitigation

Block-Wall Depressurization (BWD), Ventilation, or Suction

Blockwall depressurization and suction systems cost $1,500 to $2,500 to install. This radon remediation method is for homes with block-wall foundations. Radon can travel through the hollow parts of the brick or block and into the house.

Once all visible cracks, holes, and pipe entry points are sealed, pipes are installed in the walls so radon can be suctioned out with a mitigation fan and vented away from the home. Some homeowners prefer to install metal baseboard ducts in the walls for a more uniform look. BWD is usually done in conjunction with other mitigation methods as it is less effective than sub-slab systems.

Above Slab Air-Pressure Differential Barrier Technology (ASAPDB)

An above slab air-pressure barrier system, or ASAPDB system, costs between $250 and $1,000. This system vents and exhausts the radon-laden air from well-sealed drywall cavities and ductwork and exhausts it outside the home. The minimal negative pressures created to prevent the entry of radon-rich air into the wall cavities and ducts.

This is often a more effective method for removing radon from high-rise condominiums, as it does not increase indoor humidity levels. Air can also be blown into the drywall cavities to prevent radon from entering the high-pressure environment.

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Ventilation & Filtration Radon Abatement Methods

Variable rate mechanical ventilation systems cost around $500 to $1,400 per unit and help vent radon out of rooms and prevent its entry. The radon-filled air coming up from the soil is usually high in moisture vapor, so the goal is to keep the incoming air at an acceptable level of low moisture/humidity to prevent or reduce the amount of radon release inside the home.

Reduction System Method Radon Mitigation Cost
Heat recovery ventilation – a variable rate mechanical ventilation system Prevents indoor relative humidity from rising above a preset upper limit by transferring outgoing heat in stale air into incoming fresh air. $500–$1,400 per unit
Energy recovery ventilation – a variable rate mechanical ventilation system Prevents indoor relative humidity from falling below a preset upper limit by transferring moisture from outgoing air into incoming air. $400–$1,200 per unit
Vent in outdoor air - prevention of house depressurization Supplies outdoor air to household combustion units. Ductwork or piping can be run from any suitable exterior wall to or near the combustion unit. Cost varies
Lower level pressurization - prevention of house depressurization Keeps basement pressure higher than soil pressure below

70–90% radon reduction.
$1,500–$2,500 to install a ventilation system
Natural ventilation Allows radon gas to be released from the home’s interior. Free
  • Heat Recovery Ventilation$800–$2,000 installed Wall mounted or ducted, the system extracts heat from outgoing air and uses it to warm the air coming into the home without the two airstreams coming in contact with each other.
  • Energy Recovery Ventilation$700–$1,750 installed Wall mounted or ducted, the system extracts moisture from outgoing air and uses it to humidify the air coming into the home without the two airstreams coming in contact with each other.
  • Natural Ventilation – Ventilate the house by opening windows and vents for a free method of radon remediation. This can reduce the radon levels by up to 90%, but in extreme climates, you run the risk of negating the effects of your heating or cooling efforts and increase your energy costs. If you have a basement, one option is to close off the basement and ventilate that. If ventilating your first floor, be sure to open windows and vents on all sides of the house to ensure equal ventilation and avoid depressurization. If you have an enclosed crawlspace, adding vents can reduce radon buildup.

Radon Fan or Pump Prices

A window fan for radon mitigation costs about $20 per year to run, while a central furnace fan costs about $275 per year, and a fan used to depressurize a basement can cost up to $500 per year to run because you have to keep the radon fan running.

Exhaust fans and furnaces can lower the air pressure in the home, thus creating a suction inside the house which draws radon gas upwards from the underlying soil. The solution is to install an outdoor air supply with ducts or pipes near the fan or furnace. Install a damper and screen in the ductwork to prevent bugs, debris, and cold air from entering the home when the system is not being used. Seal off any cold-air return registers that are located in the basement. Levels of radon gas reduction will depend on the time of year, and the amount the furnace or exhaust fan is used. Most effective in very hot, humid climates or very cold climates.

“Many combustion units are designed to accept outside air, but for many others, a modification is not only illegal but may be unsafe. Gas furnaces are a prime example. In this case, directing outdoor air to a point near the furnace or enclosing the furnace in a room that is vented outdoors are appropriate measures.” — Dr. Tom Greiner

Lower Level Pressurization

A lower level pressurization ventilation system costs between $1,500 and $2,500 to install. This system keeps basement pressure higher than soil pressure below to prevent the radon from entering the home by blowing air into the basement or crawl space from a fan(s) setup at the basement entrance.

The basement must first be tightly sealed with windows kept closed, and then upstairs air is blown in. This can end up being costly because the fan needs to run continuously to maintain the 70–90% reduction levels; it can cost up to $500 per year to keep it running. This can also work for an enclosed crawlspace.

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Radon Water Mitigation Costs

On average, radon water mitigation systems cost between $1,100 and $4,700 with the average homeowner spending about $1,650 for a charcoal scrubbing system. Water treatment solutions are either GAC or aeration devices. In treating water for radon contamination, systems called point of entry devices are put in place between the water mains supply and your home.

Radon Water Mitigation System Costs
Point of Entry Device Method Radon Mitigation Cost
Carbon & Charcoal Scrubbing System* Granular activated carbon (GAC) filters are the least expensive of the two and use carbon to filter out the radon as it passes through the filter. Removes about 80% of the radon. $1,000 – $1,650
Aeration or bubble-up system Aeration devices send a stream of bubbles through the water, radon moves into the air bubbles, and extractor fans carry the radon gas out into the outside air. Removes about 90–99% of the radon. $4,500 – $4,900
Point of Use Device
Faucet filter Treats your tap water only. $80 – $140

Surface water which comes from lakes, rivers, and reservoirs is generally not a source for radon gas delivery because the radon gets released into the air. You can also be confident that your local water municipality has taken care of getting water to your home radon free, but water contamination might occur if your water source is a well or draws from an aquifer.

Carbon & Charcoal Scrubbing System

The average cost for a carbon or charcoal scrubbing system is $1,650 for two 9 x 48 tanks, GAC, tank hardware, fittings, two in-line filters and elements, and plumbing. While GAC filtration systems are less expensive, tests show that fewer than 15 percent are still reducing radon levels by 90% or better after being in service for one year. [4]

This shows that the system’s efficiency decreases over time, requiring yearly carbon replacement. Most used carbon filters are then radioactive and might require special disposal measures. The EPA has guidelines to monitor safe usage and ensure proper timing for re-testing and tank replacement.

The EPA does not recommend the use of carbon filtration for waterborne radon levels exceeding 5,000 pCi/L.

Aeration or Bubble Up System

Aeration or bubble-up system costs between $4,500 and $4,900 for the unit, an outside venting line, electrical hookup, and plumbing. This method is effective and reliable with 95% to 99% radon removal rates. While the upfront costs are high, the long-term prices are lower. Also, there’s no need for state or EPA measures.

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Radon Monitors and Smart Devices

Radon monitoring devices typically cost between $120 and $230 each. The latest radon gas detectors will digitally display the short- and long-term radon gas levels in your home with automated self-tests. They can run on battery power or be wired as fixed installations. To get the most accurate results, install them in areas of the home away from windows, areas with high humidity levels, crawl spaces, construction joints, and sump pumps. According to SafeWise, the top two digital radon detectors are:

  1. Family Safety Products Safety Siren Pro Series3 Radon Gas Detector $120–$155
  2. AirThings Corentium Home Radon Gas Detector $140–$200
  3. A top smartphone-enabled radon monitor is the Radon Eye RD200 Smart Radon Monitor Detector at $150–$230, or $412 for the RD200 Plus.

Radon Mitigation Code Requirements

It’s much easier and cheaper to build in a sub-slab radon reduction system before the slab is poured than to retrofit a home later. While there are no federal laws about making a new home radon-resistant, there are often state or local laws. See if your state does here.

Radon-resistant new construction (RRNC) usually only adds $250–$750 to the building cost vs. $800–$2,500 to retrofit a home. RRNC immediately takes care of about 50% of the radon gas in the soil. Later on, if interior gas levels are tested as being too high, the passive system can be upgraded to an active one by adding a fan that’s vented through the attic and out.

DIY Radon Mitigation

It all depends on how much of the work you plan to do yourself, and if that work will help or harm the goal of reducing radon gas levels in the home. “If you don't do it right, you might actually increase the level of radon or compromise the air quality in your house.” — Bill Wehrum, Administrator, EPA Office of Air and Radiation

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Frequently Asked Questions

What Is Radon Gas?

Radon is a colorless, odorless, tasteless, radioactive gas. High levels of radon in homes can rise up through the soil into any crack in the foundation, walls, wall cavities, construction joints, spaces in suspended floors, and the water supply. Depending on the cracks in the rock under a home, the levels of concentration will vary—anywhere from your entire property, to one corner of your garage, or only under your yard. Levels will vary and change throughout a home based on the ventilation flow.

"Radon is actually the leading environmental cause of cancer mortality in the United States. About 21,000 people die each year from it. People really underestimate its importance." — Bill Field, Professor of Occupational and Environmental Health, University of Iowa

What is radon testing?

Radon testing is either done by the homeowner or a professional using an active (requires power) or passive (no power needed) testing method to determine how much radon gas is in the home. The longer the period the testing is done over, the more accurate the results. “The DEP and the Environmental Protection Agency (EPA) both recommend that you take action to mitigate your home if your test results indicate radon levels of 4.0 pCi/L of radon or more.” — State of New Jersey DEP

How do I know if I have radon in my home or water supply?

Use a home testing kit or hire a professional inspector to test your home for radon gas levels. A professional radon inspection costs $150 on average.

Are radon inspectors and radon treatment professionals the same?

Radon inspectors inspect radon gas levels while radon treatment professionals work on reducing radon gas levels in the home, but radon treatment professionals usually also offer inspection services, as do home inspection professionals.

How much does radon fan replacement cost?

Most radon fan replacements will cost about $120–$600, which includes installation—which should be low because all the existing pipes and vents are already in place. Prices vary depending on the duct width and couplings needed.

Will installing a mitigation unit fix my radon problem?

Some units will reduce radon levels by up to 99% if you have also sealed the home, while others will only achieve a 50–90% reduction. You often need to combine reduction methods to reach the 99% result for your home’s particular needs.

How much electricity does a radon fan use?

A window fan can cost about $20 per year to run, but a central furnace fan can cost about $275 per year, and a fan used to depressurize a basement can cost up to $500 per year to run because you have to keep the radon fan running.

Do open windows help get rid of radon gas?

Absolutely, but due to the four seasons and fluctuating temps, you might not want to open them in freezing temps or temps higher than 900. You also need to be sure to open windows on all sides of the house and at all levels for proper airflow.

Do new homes have radon systems?

According to the National Association of Home Builders, about 96% of new single-family homes built in 2013 were built using green products or practices to help prevent radon.

How do I treat radon?

As far as an immediate action, you can open the windows, but it’s an interim measure, not a long-term solution. You might need to close off your basement until the problem is fixed, as the radon is coming from the soil under your home. All of the radon reduction methods mentioned above are much more efficient with a “tight house”—one appropriately sealed. Radon gas will be reduced by 50–75% from sealing work alone, or more if the correct sealing work is done in conjunction with other methods.

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Hiring a Radon Mitigation Professional

Overall, many of the proposed radon system mitigation costs are high upfront. Most of the methods will reduce your radon gas levels in the home enough, but think about the long-term effects—will the lower gas levels be maintained by your new system and at what utility cost? You might end up paying more over the years in utility costs compared to upfront costs for a passive system.

Keep the following points in mind when reading reviews about radon mitigation specialists you are thinking of hiring:

  1. Even if you have conducted testing, or a previous resident has had radon testing carried out, good contractors will do their own testing.
  2. In addition to testing, they will do a complete visual inspection, to include the foundation and home structure, to determine the most suitable system needed to ensure the safety of the inhabitants of the home. Consider using a contractor familiar with all aspects of home inspection.
  3. They will provide recommendations for the installation of a radon mitigation system that complies with all EPA guidance and regulations specific to your geographic location.
  4. They will leave the system installed, with all relevant labels attached, and provide instructions on its use.
  5. After the radon mitigation system has been installed, they will run another set of tests to verify the effectiveness of the installed system, when the results are compared to the first set of test results.
“Many states require radon professionals to be licensed, certified or registered, and to install radon mitigation systems that meet state requirements. In states that don’t regulate radon services, ask the contractor if they hold a professional proficiency or certification credential, and if they follow industry credential standards, such as the American Society for Testing and Materials (ASTM), Standard Practice for Installing Radon Mitigation Systems in Existing Low-Rise Residential Buildings, E2121.” — EPA, “A Consumer’s Guide to Radon”

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