Last updated: February 2026

Selling a House With Radon in Florida

Last updated: February 2026

Radon in Florida: The Numbers

Radon is a radioactive gas that seeps into homes through cracks in the foundation, and Florida has a bigger problem with it than most people expect. The EPA classifies counties into three radon zones. Zone 1 (highest risk) counties in Florida include Alachua, Marion, Citrus, Hillsborough, Pinellas, Hernando, Levy, Columbia, Bradford, Union, Dixie, Gilchrist, and Lafayette. The Florida Department of Health reports that roughly 1 in 5 homes tested in these counties measure at or above the EPA action level of 4 pCi/L.

Even Zone 2 and Zone 3 counties aren't safe. Florida's unique geology, specifically the porous limestone bedrock and phosphate deposits running through the central part of the state, produces radon concentrations that vary block by block. A neighbor's home can test at 2 pCi/L while yours reads 8 pCi/L. The only way to know is to test.

Radon Mitigation Costs

Fixing a radon problem is relatively cheap compared to most home issues. A sub-slab depressurization system (the standard fix for slab-on-grade Florida homes) costs $800-$1,500 installed. Homes with crawl spaces or more complex foundations run $1,500-$2,500. The system consists of a PVC pipe running from beneath the slab through the roof, with a small fan creating negative pressure to pull radon out before it enters the living space.

Mitigation Type	Foundation	Cost Range
Sub-slab depressurization	Slab-on-grade	$800-$1,500
Sub-membrane system	Crawl space	$1,200-$2,000
Complex / multi-point system	Multi-level or large footprint	$1,500-$2,500
Initial radon test (short-term)	Any	$150-$300

Compare that to a roof replacement ($15,000-$35,000) or mold remediation ($3,000-$30,000), and radon mitigation is one of the most affordable fixes in real estate. But buyers don't always see it that way.

Florida Radon Disclosure Law

Florida Statute §404.056(5) requires that every real estate contract include a specific radon disclosure statement. The exact language is prescribed by law: "Radon is a naturally occurring radioactive gas that, when it has accumulated in a building in sufficient quantities, may present health risks..." You've likely seen it. Every Florida sale contract includes it.

Beyond the standard disclosure, if you've had a radon test performed, most real estate attorneys and the Florida Realtors standard disclosure form recommend sharing the results with the buyer. Withholding known test results could expose you to liability under Florida's general material defect disclosure requirements (§689.25). If you've tested at 6 pCi/L or higher and haven't mitigated, that's something a buyer needs to know.

Health Risks and Buyer Perception

Radon is the second leading cause of lung cancer in the United States after smoking, responsible for roughly 21,000 deaths per year according to EPA estimates. Those numbers are real, but context matters. The EPA's action level of 4 pCi/L is conservative by international standards. Several European countries set their action thresholds at 5.4 pCi/L or higher. The World Health Organization's reference level is 2.7 pCi/L for new construction but 8.1 pCi/L for existing buildings, nearly double the EPA line.

The real problem for sellers isn't the health science. It's buyer psychology. Buyers hear "radioactive gas in your home" and panic. A reading of 4.1 pCi/L, barely above the action level, kills deals just as effectively as a reading of 12 pCi/L, even though a $1,000 mitigation system fixes either one permanently. Agents know this, which is why many recommend pre-listing mitigation or, if the seller wants to skip that step, selling to a cash buyer who prices the fix into the offer without the emotional reaction.

Testing Before You List: Strategic Decision

You have three paths, and each one has a different cost-benefit profile. Path A: test before listing, and if results come back below 4 pCi/L, you've got a marketing advantage. You can show buyers a clean report and remove radon from the negotiation table entirely. Path B: test and the results come back above 4 pCi/L. You now have a disclosure obligation, but you can install a mitigation system for $800 to $1,500 before listing and market the system as a selling point. Post-mitigation re-tests typically show levels under 2 pCi/L, well below the action threshold.

Path C: sell as-is to a cash buyer and skip testing altogether. If you haven't tested, there's nothing to disclose beyond the standard statutory radon language that appears in every Florida contract. This path works best when you don't want to risk a high reading that creates a disclosure obligation, or when the home has other issues that make a traditional listing impractical anyway. Cash buyers like FL Home Buyers factor potential radon costs into every offer on properties in Zone 1 counties regardless, so the number you get already accounts for it.

Why Buyers Walk After Radon Tests

The radon inspection contingency is where deals die. A buyer's home inspector runs a 48-hour continuous radon monitor and it comes back at 5.2 pCi/L. The buyer panics because they associate "radioactive gas" with serious danger, even though a $1,200 mitigation system would fix it permanently. Their agent tells them to ask for a $5,000 credit. You offer $1,500 (the actual cost). They walk.

This pattern repeats constantly in Alachua, Marion, and Hillsborough counties. Sellers in Gainesville and Ocala see it more than anywhere else in the state. The problem isn't the radon itself, it's the perception. And each time a buyer walks, you're back to square one with more days on market.

Sell Your House With Radon As-Is

FL Home Buyers purchases homes with elevated radon across all 67 Florida counties. We know what mitigation costs because we install these systems on properties we buy. Max Cohen and the team price the mitigation into our offer upfront, so there's no renegotiation after testing. If your home tested at 7 pCi/L, we'll factor in the $800-$1,500 system cost and make an offer based on after-repair value.

No inspection contingencies, no buyer panic, no deal falling through over a fixable issue. We close in 7-21 days, handle the mitigation after purchase, and pay all closing costs.