Radon mitigation cost depends mostly on your foundation, the size of the house and the method a contractor picks. Angi's September 2026 guide puts the national range at $805 to $1,326, with a $1,043 average from 1,184 projects [1]. HomeGuide's February 2026 guide runs higher, at $1,200 to $2,000 for a typical install [2]. EPA's own guide says most homes can be fixed for about the same cost as other common home repairs [3]. All of the prices below are national estimates, not local quotes.
National prices by system
| System | Angi, Sep 2026 [1] | HomeGuide, Feb 2026 [2] |
|---|---|---|
| Active soil depressurization (subslab suction) | $1,000 to $3,000 | $1,200 to $2,000; $2,500+ for large homes |
| Passive depressurization | $500 to $2,500 | not listed separately |
| Drain-tile suction | not listed | $900 to $1,800 |
| Sump pit sealing and cover | not listed | $900 to $2,500 |
| Block-wall depressurization | $500 to $3,000 (wall-based) | $1,800 to $3,000 |
| Crawl space encapsulation | $1,500 to $15,000 if needed | $3,000 to $15,000 |
| Heat recovery ventilator (HRV) | $1,300 to $2,500 (ventilation) | $1,300 to $2,200 |
One note on Angi's figures. Its summary gives $805 to $1,326 for a system, its method table lists active suction at $1,000 to $3,000, and its closing notes say a system might cost anywhere from $400 to $1,800 [1]. We show all three and don't blend them. HomeGuide lists a $500 minimum and an $8,000 maximum [2].
Sealing alone shows up in Angi's table at $400 to $4,600, and Angi calls it about half as effective [1]. EPA doesn't recommend sealing alone, because it hasn't been shown to lower levels much or consistently [3].
Testing costs
| Item | Published figure |
|---|---|
| Professional test | $125 to $400 (HomeGuide) [2]; $150 to $700 (Angi) [1] |
| Store test kit | $10 to $30 (HomeGuide) [2]; $15 to $60 (Angi) [1] |
| Johnson County Public Health kit | $12 short-term, $30 long-term, in office [4] |
| State programs | Free kits, one per household while supplies last [5] |
Iowa's mitigation rule calls for a test before and after the work unless the owner waives it in advance [6]. Ask whether the quote includes the follow-up test. HomeGuide suggests confirming that it does [2].
Fan replacement and repair
Angi's national October 2026 fan guide puts a replacement at $200 to $600, about $350 on average [7]. Repairs run $75 to $200 [7]. Fan life estimates vary. EPA says five years or more [3], while HomeGuide and Angi both say 5 to 10 years [2, 7]. More on radon fan replacement.
What drives the price
- Foundation type. Basement, slab and crawl space homes use different methods, and a house with mixed foundations may need more than one suction point [3].
- House size. Angi adds $500 to $1,500 for larger homes [1].
- Electrical work. Angi lists an electrician at $50 to $100 an hour when wiring is needed for the fan [1].
- Permits. Angi and HomeGuide both give $25 to $150. HomeGuide says most contractors include it [1, 2].
- Extras. Angi lists extended warranties at $200 to $500 [1]. HomeGuide lists digital radon detectors at $150 to $300 [2].
Running costs
EPA says a fan system slightly raises your electric bill [3]. The published figures don't agree:
- HomeGuide compares the fan to a 60-watt bulb, at about $70 to $80 a year [2].
- Angi's fan guide gives $30 to $75 a year [7].
- Angi's main guide gives $100 to $300 a year in one place and $30 to $300 in its FAQ [1].
Your rate and fan size set the real number.
Radon mitigation cost in Cedar Rapids and Iowa City
We didn't find a published Cedar Rapids or Iowa City average, so the national ranges above are the best guide. A few local and state factors still matter:
- Credentials. Under Iowa law, only state-credentialed people can do mitigation for pay [8]. Iowa HHS publishes the list, generated September 24, 2026 [9].
- Timing. The follow-up test starts no sooner than one day after the work and within 30 days of installation [6]. Iowa's rule also lists failing to finish an installation within 30 days of the start date as grounds for discipline [6].
- Newer homes. Since July 1, 2026, Iowa's building code requires a passive radon method in new one- and two-family homes [10]. EPA says a fan can be added to a passive pipe if a test comes back high [11].
- Rentals in Iowa City. City code says single-family and duplex rentals must be tested, and fixed at or above 4 pCi/L by a state-certified mitigation specialist, with a new test within 90 days [12]. Landlords there should plan on this cost.
- Insurance. HomeGuide says homeowners insurance doesn't cover mitigation or testing [2].
- Home sales. HomeGuide says the seller typically pays, but it's negotiable [2]. See radon and home sales.
How to compare quotes
Angi and HomeGuide both suggest getting three or more quotes [1, 2]. EPA's guide lists questions to ask and items a contract should spell out [3]:
- The total cost, including taxes and permit fees, any deposit, and when full payment is due.
- The time needed to finish the work.
- Whether diagnostic testing comes before the design.
- Whether a warning device is included.
- Whether testing after installation is included.
- Whether a reduction to 4 pCi/L or below is guaranteed, and for how long.
HomeGuide also says never to pay in full before installation, and to get a receipt for any partial deposit [2].
FAQ
Why do the two big guides disagree?
They use different data. Angi bases its range on 1,184 projects [1]. HomeGuide says its figures come from research and project costs reported by its members [2]. Treat them as two reference points.
Is there financial help in Iowa?
Possibly, if you live in a rural area. Iowa HHS's Healthy Hometowns: Combat Cancer plan includes reimbursement of up to $2,000 each for 500 homes needing mitigation, aimed at rural Iowa counties [13]. Washington County Public Health says homeowners there with confirmed high levels may qualify for mitigation assistance, based on program eligibility requirements [14]. Eligibility is set by each program, so ask your county public health office.
Does a passive system in a new home cost less to finish?
EPA's builder page says fixing a radon problem found after move-in can cost the owner much more than building the features in [15]. A fan can be added to the existing pipe [11].
Get a quote
Request a quote with your test result and foundation type.
We're a referral service, not a contractor. We send mitigation requests only to contractors on Iowa HHS's current credentialed list and testing requests only to state-certified radon measurement specialists, but we don't otherwise vet them, a referral is not an endorsement, and independent contractors may pay us for referrals.
Sources
- Angi, "How Much Does a Radon Mitigation System Cost? [2026 Data]," Mitchell Grant, updated Sep 28, 2026. https://www.angi.com/articles/how-much-does-it-cost-remove-radon-gas.htm
- HomeGuide, "How Much Does a Radon Mitigation System Cost? (2026)," Kristen Cramer, Feb 5, 2026. https://homeguide.com/costs/radon-mitigation-cost
- U.S. EPA, Consumer's Guide to Radon Reduction, EPA 402/K-10/005 (2025 edition, PDF). https://www.epa.gov/sites/default/files/2016-12/documents/2016_consumers_guide_to_radon_reduction.pdf
- Johnson County Public Health, Radon Information (fetched Nov 11, 2026). https://www.johnsoncountyiowa.gov/public-health/radon
- Iowa HHS, Radon program page (fetched Nov 11, 2026). https://hhs.iowa.gov/health-prevention/providers-professionals/radiological-health/radon
- Iowa Administrative Code 641, Chapter 44, Radon Mitigation (ARC 0290D, IAB 5/13/26, effective 7/1/26). https://www.legis.iowa.gov/docs/iac/chapter/641.44.pdf
- Angi, "How Much Does It Cost to Replace a Radon Fan? [2026 Data]," Angi Home Solutions Center, updated Oct 15, 2026. https://www.angi.com/articles/radon-fan-replacement-cost.htm
- Iowa Code chapter 136B, Radon Control (2026). https://www.legis.iowa.gov/docs/code/136B.pdf
- Iowa HHS, Iowa Credentialed Radon Mitigation Specialists list (PDF, report generated 9/24/2026). https://hhs.iowa.gov/media/7883/download?inline
- Iowa HHS, Radon Resources (fetched Nov 11, 2026). https://hhs.iowa.gov/health-prevention/providers-professionals/radiological-health/radon/radon-resources
- U.S. EPA, How to Address Radon When Building a New Home, last updated Aug 17, 2026. https://www.epa.gov/radon/how-address-radon-when-building-new-home
- City of Iowa City Code of Ordinances, Title 17 Chapter 5 Housing Code, sections 17-5-18(T) Radon Testing and 17-5-19(N) Supplied Facilities (fetched Nov 11, 2026). https://codelibrary.amlegal.com/codes/iowacityia/latest/iowacity_ia/0-0-0-15483
- Iowa HHS, Iowa Healthy Hometowns Cancer Efforts (fetched Nov 11, 2026). https://hhs.iowa.gov/health-prevention/cancer/iowa-healthy-hometowns-cancer-efforts
- Washington County Public Health, "Free Radon Test Kits for Rural Homeowners," news post, Oct 14, 2026. https://washph.com/About-Us/News/%EF%B8%8F-free-radon-test-kits-for-rural-homeowners%EF%B8%8F-2
- U.S. EPA, Radon-Resistant Construction Basics and Techniques, last updated Aug 6, 2026. https://www.epa.gov/radon/radon-resistant-construction-basics-and-techniques