Radon Mitigation Cost: Published Prices, Fan Power and Grants

The figures below are each tied to a named publisher and a date, because the EPA range that still circulates online dates from 2006. How the systems work, and who may install them, is covered in our radon mitigation guide; this page is about money. More cost pages sit under Pricing.

Every published figure, side by side

Six sources are compared here. They do not agree, and the spread is the useful part: it is roughly the gap between a single-point slab job and a crawl space or multi-point system.

Source	Date	What it publishes	Basis
EPA Consumer’s Guide	December 2006	$800 to $2,500, average about $1,200	Whole job, contractor
National Radon Program Services, Kansas State University	Undated	Average $1,200; $800 to $1,500 common	National
University of Nevada, Reno Extension	2022	About $2,500 slab or basement; about $3,800 or more crawl space	Certified or licensed contractor
Minnesota Department of Health	Updated March 2023	Avoid quotes under $1,000	Warning, not a range
Peerless Environmental (South Carolina contractor)	July 2026, updated September 2026	Sub-slab $800 to $2,800; crawl space $1,200 to $3,500	National averages it cites
RadonSeal (sealer manufacturer)	Updated August 2026	Repeats $800 to $2,500, attributed to EPA	Sells an alternative

According to the University of Nevada, Reno Extension, a slab or basement home averages about $2,500 and a crawl space home about $3,800 or more, the highest of the public sources here. The Minnesota Department of Health gives no range but warns that quotes under $1,000 “are often too good to be true.”

Why EPA’s number is from 2006

The EPA Consumer's Guide, December 2006 edition (EPA 402-K-06-094) said the cost of a contractor fixing a home “generally ranges from $800 to $2500,” with an average of about $1,200, and printed a cost table by technique. The March 2013 edition dropped both. So did the 2016 edition and the 2025 revision of the EPA Consumer's Guide to Radon Reduction, which says only that most homes “can be fixed for about the same cost as other common home repairs.”

The figure still circulates as EPA’s current estimate: RadonSeal attributes it to the Citizen’s Guide, which, in its 2025 revision, prints no dollar figure. Adjusted by the BLS CPI-U, series CUUR0000SA0 annual averages for 2006 and 2025, a factor of 1.60, EPA’s range becomes about $1,280 to $3,990, and the $1,200 average about $1,920. That lands close to the 2022 Nevada figure and the 2026 contractor range.

Cost by technique, from EPA’s last table

The 2006 table is the only government source found that prices each method separately, and it still explains the order of magnitude. Operating cost covers the fan’s electricity and the heated or cooled air the system removes.

Technique	Installation, 2006	Operating, per year
Subslab suction	$800 to $2,500	$50 to $200
Drain tile suction	$800 to $1,700	$50 to $200
Sump hole suction	$800 to $2,500	$50 to $250
Block wall suction	$1,500 to $3,000	$100 to $400
Submembrane, crawl	$1,000 to $2,500	$50 to $250
Passive subslab	$550 to $2,250	Some energy penalties
House pressurization	$500 to $1,500	$150 to $500
Heat recovery ventilator	$1,200 to $2,500	$75 to $500

What moves the price

The EPA Consumer's Guide to Radon Reduction says the number of suction points depends on how easily air moves in the material under the slab and on the strength of the radon source. That is sub-slab permeability, which a soil communication test can check before the quote is final.

Driver	Effect on price	Source
Foundation type	Crawl space and block wall start higher	EPA 2006 table; UNR; Peerless
Sub-slab permeability	Each extra suction point adds $300 to $600, per Peerless	EPA: points depend on air movement
Concealing the pipe	Cosmetic treatment raises the price	EPA 2006 note 2; NRPS
Crawl space membrane	Starts higher than slab suction	EPA 2006: $1,000 to $2,500; Peerless: $1,200 to $3,500
Existing sump or drain tile	Lower top end than sub-slab	Peerless: $800 to $1,500; EPA 2006 drain tile: $800 to $1,700
Passive pipe already in	Adding a fan is far cheaper	EPA 2006: about $300; Peerless: $500 to $1,000
Electrical and permits	May be extra; ask if included	EPA contract checklist; MDH

Fan placement matters because the fan may not sit in or below living space, per EPA, so it goes in an attic, a garage or on an outside wall. NRPS notes that part of the cost depends on what is needed to conceal the system. For a crawl space, a radon membrane is not full encapsulation; that larger moisture job is priced on our crawl space encapsulation cost page. Where the suction point is a sump, the pump itself is a sump pump installation line.

Running cost, computed from the spec sheet

The RadonAway RP Series product sheet, dated August 2015, rates its inline fans from 15 to 152 watts. A fan runs 24 hours a day, 365 days a year, so annual kilowatt hours are watts times 8.76. The price is the EIA Electric Power Monthly Table 5.3 US residential average for the 12 months ending July 2026: 17.99 cents per kWh.

Model	Rated watts	kWh a year	Per year	Per month
RP140	15 to 21	131 to 184	$24 to $33	$2 to $3
RP145	41 to 72	359 to 631	$65 to $113	$5 to $9
RP260	50 to 75	438 to 657	$79 to $118	$7 to $10
RP265	91 to 129	797 to 1,130	$143 to $203	$12 to $17
RP380	95 to 152	832 to 1,332	$150 to $240	$12 to $20

Location changes it. Using data from EIA Table 5.6.B for residential prices from January to July 2026, the same RP145 at 72 watts costs $189 a year in Maine and $90 in Iowa. Electricity is not the whole running cost: EPA’s 2006 operating range of $50 to $200 for subslab suction includes lost heated or cooled air, and RadonSeal puts that loss at $175 to $350 a year, a figure from a company selling an alternative.

Fan replacement and the ten-year cost

The current EPA Consumer's Guide to Radon Reduction says fans “may last for five years or more,” warranties “tend not to exceed five years,” and the replacement cost “varies.” The 2006 edition put it at $200 to $350 including parts and labor, about $320 to $560 in 2025 dollars. Peerless Environmental reports $300 to $600 installed, every five to ten years. National Radon Program Services gives fan life spans of 10 to 15 years, and the RadonAway sheet a five-year warranty.

Scenario	Install	Ten years of electricity	One fan swap	Ten-year total
Low end, slab	$800 (Peerless low)	$646 (41 W)	$300	$1,746
High end, slab	$2,800 (Peerless high)	$1,135 (72 W)	$600	$4,535
Crawl space	$3,800 (UNR)	$1,135 (72 W)	$600	$5,535

Grants and loans

Colorado runs the clearest programme found. According to its Colorado LIRMA procedures, revised 1 July 2026, it pays up to $7,000 per application for owner-occupied homes under county income limits, such as $74,800 for one person in Denver County. The home needs a test above 4 pCi/L within a year from an approved device; consumer-grade monitors are refused, as are rentals, homes listed for sale and homes with an existing system. The contractor is paid after a post-test below 4 pCi/L.

Programme	Who runs or lists it	What it offers	Who qualifies
Colorado LIRMA	CDPHE	Up to $7,000 per application	Owner-occupied, income limits, test above 4 pCi/L within a year
Minnesota housing loans	Listed by MDH	Rehabilitation, emergency and Fix-Up loans	Low-income or general home improvement
USDA rural repair	Listed by MDH and CDPHE	Loans and grants	Very low-income rural owners
HUD 203k and CDBG	Listed by CDPHE and Oregon	Rehabilitation financing	Programme rules apply
Oregon	Oregon Health Authority	None	“does not have or offer financial assistance”

No federal radon mitigation grant for homeowners appeared in the EPA guides read for this page. Insurance is a separate question for the policy and the state insurance department.

Radon in a home sale

The EPA Home Buyer's and Seller's Guide to Radon, revised March 2024, suggests the contract say “when radon mitigation measures will be taken, and who will pay for them.” The MDH radon in real estate page puts it plainly: buyers and sellers “can negotiate radon testing, radon mitigation system installation, and who is responsible for the costs.” EPA tells sellers that test and repair records “could be a positive selling point.”

State	Rule at sale	Source
New Jersey	Seller gives the buyer test results and evidence of mitigation at contract	N.J.A.C. 7:28-27.3
Minnesota	Seller discloses known radon tests, levels and any system before the purchase agreement	MDH radon in real estate page
Florida	Radon notice on at least one sale or rental document	Fla. Stat. 404.056(5)
Iowa	Tester may share results under five years old with a buyer who made an offer and paid for the test	Iowa Code 136B.2

New construction changes the arithmetic. EPA’s 2006 guide put adding a fan to a passive pipe at about $300; Peerless lists $500 to $1,000 in 2026.

Check a quote in eight lines

EPA advises more than one estimate and lists what a contract should hold. These eight lines turn that into a checklist.

Line	It should say	Why
Credential	State license number or NRPP or NRSB ID	EPA contract checklist
Total price	Taxes and permit fees included	EPA contract
Suction points	Number and location	Drives price, per EPA
Fan location	Attic, garage or exterior	EPA install rules
Warning device	Gauge or alarm	EPA requires one
Post-mitigation test	Who runs it, within 30 days	EPA Consumer’s Guide
Guarantee	Target level, length, transferable on sale	EPA contract
Price check	Under $1,000 deserves questions	MDH

For contractors: the line items

Credentials are a fixed cost: according to their fee pages, NRPP charges $275 for a two-year mitigation specialist certification and NRSB $125 a year. Minnesota charges $250 a year to license a mitigation professional and adds $75 per job for the state system tag, per the statute (Minn. Stat. 144.4961), a per-job line item. According to its procedures, Colorado’s LIRMA requires $1,000,000 in general liability, auto and workers’ compensation cover, a five-year warranty on fan and workmanship, and bids within seven business days.

Restoration jobs touch radon systems after basement water losses. Price resealing a sump lid, reconnecting a pipe or a post-rebuild retest as separate lines. A basement flood cleanup or waterproofing scope that disturbs the system should name who restores it.

Questions people actually ask

Is radon mitigation worth it?

EPA recommends fixing a home at 4 pCi/L or higher and says most homes cost about the same as other common repairs. Based on data from the sources here, ten years of ownership runs about $1,746 to $4,535 for a slab home, including a fan swap. EPA also tells sellers that test and repair records can be a positive selling point.

Is it hard to sell a house with radon?

EPA advises sellers to test before listing, fix high levels and keep the records. Some states require disclosure: New Jersey sellers must hand over test results and mitigation evidence at contract, and Minnesota sellers must disclose what they know. EPA’s buyer guide suggests the contract state who pays for mitigation, so cost becomes a negotiating line.

Will insurance pay for radon mitigation?

This page does not say what any policy pays. Check the policy wording, ask the state insurance department, and talk to a licensed professional. Public help exists in some states: according to its procedures, Colorado’s LIRMA pays up to $7,000 for qualifying low-income owners, and Minnesota’s health department lists state housing loans that can cover a system.

In what month is radon highest?

EPA’s guides do not name a month. The Citizen’s Guide says levels vary from day to day and season to season, which is why a short-term test is less likely than a long-term test to show the year-round average. Testing season does not change the installation price; foundation type and suction points do.

What is the monthly cost of a radon mitigation system?

For a RadonAway RP145 rated 41 to 72 watts, about $5 to $9 a month in electricity, per the EIA US average of 17.99 cents per kWh. Lost heated or cooled air adds to that; EPA’s 2006 table put operating cost for subslab suction at $50 to $200 a year.