How much does radon mitigation cost?

National figures published by named sources: US EPA Region 3 (archived news release) (2008) cites $800 to $2,500 to retrofit an existing home (vs. $350 to $500 built in during construction). State programs publish their own ranges, listed state by state on this page with a link to each source.

Why does radon mitigation cost more in some states?

Local labor rates, the mix of foundation types (crawlspaces and mixed foundations cost more than a simple basement slab), soil that makes suction harder, local code requirements for where the exhaust must vent, and whether the state licenses mitigators all move the price. Published state ranges also come from different years.

Does the EPA publish a radon mitigation cost?

EPA's consumer page on mitigation cost does not give a dollar figure. It says most homes can be fixed for about the same cost as other common home repairs, that cost depends on the size and design of the home and the method needed, and that you should get estimates from one or more qualified contractors.

Is there financial help for radon mitigation?

Some states run assistance programs: Colorado (CDPHE Low Income Radon Mitigation Assistance (LIRMA)), West Des Moines, Iowa (City Radon Mitigation Program), St. Joseph County, Indiana (Free radon remediation system (County Department of Health)), Brown County, Wisconsin (Brown County Radon Mitigation Initiative), Rural homeowners (USDA Section 504) (USDA Home Repair loans and grants, as listed by NYSDOH). Check with your state radon program for current funding and eligibility.

What are the ongoing costs of a radon system?

The fan runs continuously, so there is a small electricity cost, and fans typically need replacing after many years of service. Retest every two years or after major renovations to confirm the system still works.

Radon mitigation cost by state

What it costs to install a radon mitigation system, using only figures that state radon programs, health departments, extension services and other named sources have published. Every dollar figure on this page links to the page that states it. States that publish no figure are listed at the end rather than filled in with a guess.

Published ranges are not quotes. Sources were written in different years and describe a typical single-family home. Get written bids from two or three certified mitigators. Figures checked 2026-10-19.

National figures

$800 to $2,500 to retrofit an existing home (vs. $350 to $500 built in during construction) - US EPA Region 3 (archived news release), 2008

The EPA itself does not put a dollar figure on its mitigation-cost page: it says most homes can be fixed for about the same cost as other common home repairs, depending on the size and design of the home and the reduction method needed. That is why the state ranges below matter - they are the closest thing to an official local benchmark.

Published cost ranges, state by state

State	Published figure	Source	Predicted basement avg.
Colorado	$1,500 – $2,500 as the average cost of mitigation	Garfield County, Colorado	2.6 pCi/L
Connecticut	$1,200 as the approximate cost of a mitigation system in Connecticut	Connecticut Department of Public Health	1.5 pCi/L
Georgia	$900 to $3,000 (average about $1,500)	University of Georgia Cooperative Extension	1.9 pCi/L
Idaho	$1,500–$3,500 for professional installation ($300–$600 in parts for DIY)	Idaho Department of Health and Welfare	2.6 pCi/L
Illinois	$1000 to $1500 for installation of an active system	Illinois Emergency Management Agency	1.9 pCi/L
	$800 and $1,200 as the usual range for a mitigation system	Illinois Department of Public Health
Indiana	$1,500 to $2,500 for a mitigation system	Indiana Department of Health (2023, updated 2026)	2.3 pCi/L
Iowa	$800 to $2,500 for a system from a certified Iowa contractor, depending on the home	Iowa HHS	3.5 pCi/L
Kansas	$800 to about $2,000 (about $1,200 typical) for contractor mitigation	Kansas Radon Program (K-State Research and Extension)	2.6 pCi/L
Kentucky	$1,200 to $2,500 to lower radon in an existing home	University of Kentucky BREATHE (2024)	2.5 pCi/L
Maine	$1,500 and $3,000 for a sub-slab system including installation	Maine CDC	2.2 pCi/L
Massachusetts	$1,000 and $1,500 for most mitigation systems	Massachusetts Department of Public Health	1.8 pCi/L
Michigan	$750-$1,500 as a typical price range in Michigan	Michigan EGLE (2020)	1.6 pCi/L
Minnesota	$1,500 to $3000 for a mitigation system	Minnesota Department of Health	2.4 pCi/L
Montana	$500 to about $2,500 (around $1,200 typical) for contractor mitigation	Montana DEQ	3.1 pCi/L
New Jersey	approximately $1,300 as the average price of a sub-slab system with fan	Readington Township Health Department	1.3 pCi/L
New York	about $2,500 as the average cost of a radon reduction system	New York State Department of Health	1.4 pCi/L
North Carolina	$1,000 to about $2,500 (about $1,500 typical) for contractor mitigation	NC DHHS Radon Program	1.7 pCi/L
Ohio	$2,000 or more for mitigation in an existing home	Ohio Department of Health (2024)	2.8 pCi/L
Pennsylvania	$500 to $2,000 (average $1,000) to fix a home	Pennsylvania DEP	2.3 pCi/L
	$800 and $1,200 for most installations	Pennsylvania DEP
South Dakota	$1,200 as the average installation cost	South Dakota DANR	3.9 pCi/L
Tennessee	$800–$2,500 to retrofit (vs. $350–$500 during construction)	Tennessee Department of Health	2.3 pCi/L
Utah	around $1500 for a mitigation system	Utah DEQ	2.3 pCi/L
Vermont	$1,500 to $2,500 to install active soil depressurization	Vermont Department of Health (2024)	1.7 pCi/L
Virginia	$800 and $2,500 for mitigation ($800-1200 for a typical sub-slab system)	Virginia Department of Health	1.6 pCi/L
Wisconsin	$1,000-$2,000 as the average contractor installation cost	Wisconsin DHS	2.0 pCi/L
Wyoming	$500 and $1500 for mitigation, per a Wyoming Department of Health official	Wyoming Public Media (2018) - non-government	3.0 pCi/L

Predicted basement average: population-weighted long-term model estimate for the state (2001-2021 National Radon Exposure Model), not a test result. Follow the state link for county and ZIP detail. Colorado homeowners: see radon in Colorado for Front Range county levels and the state's assistance program.

What drives the price

Foundation type. A basement slab over gravel is the simplest job. Crawlspaces need a sealed membrane and are usually the most labor-intensive; homes with a mix of basement, slab and crawlspace may need suction on each.
Sub-slab communication. Dense clay or a slab poured directly on soil may need two or more suction points or a stronger fan. Good installers test this before quoting.
Pipe route and exhaust. An exterior run up the side of the house is cheaper than a concealed route through closets and a finished basement; some codes require the exhaust to discharge above the roof.
Local labor and licensing. Labor markets differ, and states that license mitigators add compliance costs and, usually, quality.
Starting level and target. Getting a very high house below 2 pCi/L can take more than getting a moderate one below 4.
New construction. A home built with a passive radon pipe (radon-resistant new construction) can often be activated by adding a fan, the cheapest fix there is.

Ongoing costs are the fan's electricity and an eventual fan replacement. See the mitigation guide for how each system type works and what a good bid includes.

State assistance programs

Colorado: CDPHE Low Income Radon Mitigation Assistance (LIRMA) - homeowner and contractor applications on the program page; CDPHE's 2024 rulemaking notice shows assistance limited to a maximum of $1,500 per homeowner and nearly $950k paid to about 493 homeowners since 2018 (CDPHE 2024 LIRMA rulemaking notice).
West Des Moines, Iowa: City Radon Mitigation Program - grants of up to $5,000 per home for income-qualified households.
St. Joseph County, Indiana: Free radon remediation system (County Department of Health) - grant funding of up to $1,500 for the system for qualifying households.
Brown County, Wisconsin: Brown County Radon Mitigation Initiative - $1,000 toward mitigation for 50 randomly selected homes (2026 update).
Rural homeowners (USDA Section 504): USDA Home Repair loans and grants, as listed by NYSDOH - loans up to $40,000; grants have a lifetime limit of $10,000.

Funding and eligibility change from year to year; confirm with the program before you sign a contract.

States without a published figure

We have not yet found a cost figure published by an official or named source for: Alabama, Alaska, Arizona, Arkansas, California, Delaware, District of Columbia, Florida, Hawaii, Louisiana, Maryland, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, New Mexico, North Dakota, Oklahoma, Oregon, Rhode Island, South Carolina, Texas, Washington, West Virginia. For these states, use the national figures and neighboring states as a rough guide, contact your state radon program, and get bids from certified mitigators via the EPA find-a-professional page.

Getting a fair price

Confirm the problem first: two short-term tests averaging 4 pCi/L or more, or one long-term test. See how to test, and if it is the cold season, why winter tests catch the worst case.
Get two or three written bids from NRPP- or NRSB-certified mitigators that name the fan model, number of suction points, pipe route, exhaust location and warranty.
Ask for a guarantee to reach a stated level and for a post-installation test within 30 days.
Compare your bids against the published range for your state above. A bid far above it should come with a reason (crawlspace, multiple foundations, interior routing).

Look up the radon level where you live

Predicted (model estimate) long-term averages for an area, not a reading from any home. Use them to decide how urgently to test.

States

Counties

ZIP codes

Highest predicted: 7.5 pCi/L. Search any ZIP from the homepage.

Tested high? Read how radon mitigation works and what it costs.

Radon mitigation cost FAQ

How much does radon mitigation cost?: National figures published by named sources: US EPA Region 3 (archived news release) (2008) cites $800 to $2,500 to retrofit an existing home (vs. $350 to $500 built in during construction). State programs publish their own ranges, listed state by state on this page with a link to each source.
Why does radon mitigation cost more in some states?: Local labor rates, the mix of foundation types (crawlspaces and mixed foundations cost more than a simple basement slab), soil that makes suction harder, local code requirements for where the exhaust must vent, and whether the state licenses mitigators all move the price. Published state ranges also come from different years.
Does the EPA publish a radon mitigation cost?: EPA's consumer page on mitigation cost does not give a dollar figure. It says most homes can be fixed for about the same cost as other common home repairs, that cost depends on the size and design of the home and the method needed, and that you should get estimates from one or more qualified contractors.
Is there financial help for radon mitigation?: Some states run assistance programs: Colorado (CDPHE Low Income Radon Mitigation Assistance (LIRMA)), West Des Moines, Iowa (City Radon Mitigation Program), St. Joseph County, Indiana (Free radon remediation system (County Department of Health)), Brown County, Wisconsin (Brown County Radon Mitigation Initiative), Rural homeowners (USDA Section 504) (USDA Home Repair loans and grants, as listed by NYSDOH). Check with your state radon program for current funding and eligibility.
What are the ongoing costs of a radon system?: The fan runs continuously, so there is a small electricity cost, and fans typically need replacing after many years of service. Retest every two years or after major renovations to confirm the system still works.

Figures are reproduced as published by each linked source and were checked on 2026-10-19. They describe typical jobs, not quotes.