High Radon in Your Connecticut House? What to Do
Can you sell a house with high radon in Connecticut?
Yes. Sell 2 Us buys houses with high radon for cash anywhere in Hartford County, as-is. We pay the closing costs, can close in as little as 7 days, you can leave anything behind, and we can help with moving costs. Call or text (860) 288-3536 for a free, no-obligation offer.
Radon is an invisible, odorless gas that comes from the ground, and the only way to know your level is to test. Connecticut DPH follows the EPA recommendation to reduce radon at 4 pCi/L or higher, and high levels can show up anywhere in the state. A typical mitigation system costs about $800 to $1,300 nationally and is often installed in a day.
What it costs
| What | Typical cost | Source |
|---|---|---|
| Radon mitigation system (national average) | $800 to $1,300 (average about $1,000) | angi.com |
| Radon mitigation, complex jobs (national range) | Up to about $2,500 | angi.com |
| Radon-in-water carbon (GAC) system, for well water under 10,000 pCi/L | $1,500 to $3,500 | portal.ct.gov |
| Radon-in-water aeration system, for well water at 10,000 pCi/L or more | $5,000 to $7,000 | portal.ct.gov |
Ranges are published estimates; your quote depends on the house. Get two or three written quotes.
Connecticut rules to know
- DPH follows the EPA recommendation to reduce indoor radon at 4 pCi/L or higher, and notes that high radon can occur sporadically in all parts of Connecticut (source: portal.ct.gov)
- Connecticut doesn't issue its own radon license; radon testers and mitigators must hold national NRPP or NRSB certification, and DPH keeps lists of certified professionals (portal.ct.gov; portal.ct.gov)
- For private wells, DPH recommends a radon-in-water treatment system when the average of two samples is 5,000 pCi/L or higher (source: portal.ct.gov)
- DPH says the best time to test is November through March, and local health departments hand out free short-term test kits each year (source: portal.ct.gov)
- The state disclosure form asks whether a radon test has been performed and requires attaching a copy of the report (source: portal.ct.gov)
Who to call
- A nationally certified (NRPP or NRSB) radon mitigation professional from the DPH list (source: portal.ct.gov)
- A certified radon measurement professional for a real estate or follow-up test
- Your local health department for a free test kit
- A doctor if you have health concerns about long-term radon exposure, especially if anyone in the home smokes
DIY or hire a pro?
Testing with a short-term kit is an easy DIY step. Installing a mitigation system or a well-water radon treatment system should be done by a nationally certified mitigation professional.
If fixing it is more than you want to take on
Radon is one of the easier problems to fix, so most sellers install a system and list normally. You can also sell as-is and share your test results (the state form asks for them), and buyers often negotiate a credit instead. Selling as-is to a cash buyer is an option if radon is one of several issues, but for radon alone the fix is usually cheaper than the discount.
Want a cash offer on the house as it is?
Sell 2 Us buys houses as-is across Connecticut: no repairs, no cleanout, no fees. You pick the closing date.
Common questions
Is radon a problem in Connecticut?
DPH says high radon levels can occur in all parts of Connecticut, so every home should be tested regardless of town.
What radon level is dangerous in Connecticut?
Connecticut follows the EPA guideline to fix homes at 4 pCi/L or higher. For well water, DPH recommends treatment at 5,000 pCi/L or higher.
How much does radon mitigation cost?
Nationally, most systems cost about $800 to $1,300, with complex homes up to about $2,500. Well-water systems cost $1,500 to $7,000 depending on the level.
Does Connecticut license radon contractors?
Connecticut doesn't issue its own radon license, but requires national NRPP or NRSB certification and publishes lists of certified mitigation professionals.
Do I have to test for radon when selling a house in Connecticut?
Testing isn't mandatory, but the state disclosure form asks whether a test was done and requires attaching the report if so, and many buyers test during inspection.
Where can I get a free radon test kit in Connecticut?
Many local health departments give out free short-term test kits each year; call yours, especially in the November to March testing season.
Related guides: Mold · Asbestos · Lead paint · Termites & pests · Foundation problems · Roof replacement · all house problem guides
Sources
Checked September 2026: portal.ct.gov · portal.ct.gov · portal.ct.gov · angi.com · portal.ct.gov
General information, not legal, tax, medical or engineering advice. Rules and prices change; confirm with the agency or a licensed professional.
By the numbers: 713 foreclosure cases were filed in Hartford County from January 1 to September 25, 2026, the most of any Connecticut county (our Connecticut foreclosure report, from CT Judicial Branch court records). Sell 2 Us has bought over 100 houses in 10 years.
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