What Is Radon Mitigation in Jacksonville?
Radon mitigation in Jacksonville, FL means installing a system that pulls radioactive radon gas out from under a house before it seeps up through the slab and into the air a family breathes every day. Radon comes from uranium breaking down naturally in soil and rock, and it moves upward through any crack, sump pit, or utility penetration it can find. Duval County sits in an area the EPA rates as lower risk on paper, but actual test results tell a different story: homes tested locally have come back averaging around 6 pCi/L, well above the EPA’s 4 pCi/L action level.
Almost every house in Jacksonville is built slab-on-grade rather than over a basement, which changes how a mitigation system gets designed compared to homes up north. A sub-slab depressurization system, a sealed pipe run beneath the slab connected to an exterior fan, creates negative pressure under the house and vents the gas safely above the roofline instead of into the living space.
Radon is the second leading cause of lung cancer in the United States after smoking, and the leading cause among people who have never smoked, according to the EPA. It has no smell, no color, and no taste, so a test is the only way to know whether a Jacksonville home has a problem — nobody notices it on their own.
When Do You Need Radon Mitigation?
You need radon mitigation if a test comes back at 4 pCi/L or higher — that’s the number the EPA and the Florida Department of Health both use as the trigger point, and it applies no matter how new or well-built the house is. A few situations make testing, and likely mitigation, especially worth doing sooner rather than later:
- Buying or selling a home in Duval County, since more lenders and buyers now ask for a radon report before closing.
- Finishing a room addition or slab extension, which can open new pathways for gas to enter.
- Noticing a musty, damp crawl space smell along with higher-than-normal indoor humidity.
- Never having tested a home built before 2015, when radon-resistant construction practices were far less common in Northeast Florida.
Homes with sealed, energy-efficient windows and doors also trap indoor air more than older leaky construction, which can push measured radon levels higher even in an otherwise well-maintained house.
How Sub-Slab Depressurization Works in Jacksonville
Most Jacksonville homes get a single-point sub-slab depressurization system, and installation typically takes a single day. First, our crew cuts one core hole through the slab, usually in a garage, closet, or utility area to stay out of the way, and clears a small suction pit beneath it so the fan has room to pull air.
From there, sealed PVC pipe runs up through an interior wall or the garage, then continues outside and above the roofline, the same rule that applies to a plumbing vent stack. An in-line radon fan mounted in the attic or on an exterior wall runs continuously, creating negative pressure under the slab so soil gas gets pulled up and out instead of seeping through cracks into the house. Every penetration, expansion joint, and sump lid gets sealed with polyurethane caulk during the same visit.
Within 24 to 48 hours the system is doing its job. We come back with a calibrated continuous monitor to confirm the finished reading before calling the job done.
Duval County’s soil is a mix of sand over porous limestone in a lot of neighborhoods, and that limestone can carry soil gas more easily than dense clay does in other parts of the state. Central air conditioning also runs almost year-round here, and a running AC system slightly depressurizes a house relative to the soil underneath it, which can pull more radon indoors than in a home that’s naturally ventilated. Neither of those facts means every Jacksonville home has a radon problem, but they’re part of why a real test matters more here than the county’s official EPA zone rating alone would suggest.
Why Jacksonville Homeowners Choose Us
State-Licensed Crews
Every technician holds a Florida radon mitigation license through the Department of Health, which the state requires specifically for this work — it isn’t covered under a general contractor’s license.
Same-Day Confirmed Results
We retest with a continuous radon monitor rather than a mail-in charcoal kit, so you get a confirmed number the same week instead of waiting on lab results.
Five-Year Fan Warranty
If a system ever needs a second suction point to bring levels down further, that return visit is included under warranty rather than billed as a new job.
How Much Does Radon Mitigation Cost in Jacksonville?
A standard single-point sub-slab depressurization system in a Jacksonville home runs $1,000 to $1,500 installed, and most homes need nothing more than that. Larger footprints, homes with multiple foundation sections poured at different times, or houses that need a second suction point to bring a stubborn reading down can push the total to $1,800–$2,200.
| Service | Typical Cost |
|---|---|
| Radon test (short-term) | $150 – $250 |
| Standard single-point system | $1,000 – $1,500 |
| Second suction point / larger slab | $1,800 – $2,200 |
| Crawl space vapor barrier add-on | $900 – $1,800 |
What actually moves the price: how many separate slab sections the house has, since additions poured later often need their own suction point, whether the fan has to be routed through an attic with limited access, and whether a crawl space area needs a vapor barrier worked in alongside the slab system. We give a firm, written price after a short walk-through, not a phone estimate, because guessing at slab layout is how installers end up needing a second visit.
Is Radon Mitigation Right for Your Home?
Radon mitigation makes sense if your test result sits at or above 4 pCi/L, if you’re closing on a home sale and the buyer’s inspection flagged an elevated reading, or if you simply want a confirmed number instead of a guess before moving your family in. It’s usually not urgent if a short-term test came back under 2 pCi/L, since that’s comfortably below the action level, and a long-term follow-up test is a reasonable next step instead of an immediate system.
If your result lands between 2 and 4 pCi/L, the EPA still recommends considering mitigation, especially if anyone in the household is a smoker or former smoker, since radon and smoking combined multiply lung cancer risk rather than simply adding to it. When in doubt, a $150–$250 test is a lot cheaper than guessing wrong in either direction.
Frequently Asked Questions
How long does radon mitigation take in Jacksonville?
Installation itself is usually a single day, start to finish, for a standard slab-on-grade home. The system starts reducing radon immediately, and levels typically drop 24 to 48 hours after the fan is switched on. We schedule a confirmation test with a continuous monitor once that window has passed so you get a real number, not an estimate.
Do older Jacksonville homes need a different type of system?
Homes built before slab vapor barriers became standard sometimes need a slightly larger suction pit or a second core point because the fill material under the slab is less consistent. Homes with a crawl space section, common in some of Jacksonville’s older Riverside and Avondale-era construction, usually need a vapor barrier encapsulation system paired with the slab system rather than a single point covering the whole house.
Will a radon fan run up my electric bill?
A typical radon fan draws about the same power as a bathroom exhaust fan and runs continuously, which adds somewhere around $5 to $10 a month depending on the fan size and your local electric rate. Most homeowners consider that a small tradeoff compared to the cost of testing and re-testing without a permanent fix in place.
What happens if my radon level is still high after mitigation?
A properly sized single-point system brings the vast majority of Jacksonville homes below 4 pCi/L, but a small percentage need a second suction point if the slab has multiple pours or an unusually dense fill layer underneath. That follow-up visit is included in our standard warranty rather than treated as a separate job, and we don’t consider the work finished until the confirmed retest comes back under the action level.
Can I sell my Jacksonville home without fixing a high radon reading?
Legally, yes, Florida doesn’t require radon remediation before a home sale. In practice, most purchase contracts written today include a radon contingency, and buyers who get a reading above 4 pCi/L often ask the seller to either install a system or credit the cost at closing, so handling it ahead of listing usually saves time and negotiating leverage later.
Get a Radon Reading You Can Trust
Call now and we’ll walk you through testing or installation over the phone before ever setting foot on your slab.
Call (904) 516-8985 Now