Radon Testing in Saint Augustine, FL

Radon testing measures how much radioactive radon gas has built up inside your home, reported in picocuries per liter, or pCi/L. The EPA recommends fixing any home that tests at or above 4.0 pCi/L. A short-term test runs two to seven days. A long-term test runs ninety days or more and gives a truer annual picture.

How does a radon test actually work?

We place a calibrated continuous radon monitor on the lowest level of your home that you actually live in. The monitor samples the air hourly and logs every reading, so rather than one averaged number you get a curve showing how radon moved through the house across the whole test period.

Placement matters more than most people expect. The monitor sits at least twenty inches off the floor, away from exterior walls, drafts, and direct sun, and it stays put for the duration. The house needs to be kept under closed-house conditions: windows and exterior doors shut except for normal coming and going, HVAC running as usual, and no whole-house fans pulling outside air through the place. Open a window for a day and the test is measuring your neighborhood, not your home.

Short-term or long-term: which test do you need?

Radon is not a steady number. It rises and falls with barometric pressure, rainfall, soil moisture, and how tightly the house is closed up. That variability is the entire reason two different test lengths exist.

• Short-term, two to seven days: fast, and the right call when you need an answer now, such as a real estate contingency or a first look at a home that has never been tested.
• Long-term, ninety days or more: slower, but it averages out weather swings and comes closest to your actual year-round exposure.
• A sensible sequence: start short-term. If the result lands near or above 4.0 pCi/L, either confirm with a second short-term test or move to a long-term test before deciding.

If a short-term test comes back very high, say 8 pCi/L or more, nobody waits ninety days to act. Confirm it, then fix it.

What do the numbers actually mean?

Results come back in picocuries per liter of air. Here is the plain reading of them:

• Below 2.0 pCi/L: low. Retest every couple of years, or after major renovations.
• 2.0 to 3.9 pCi/L: the EPA suggests you consider mitigation. Since no level of radon is risk-free, this range is a judgment call based on how much time you spend at home.
• 4.0 pCi/L and above: the EPA action level. Mitigation is recommended.
• Above roughly 8 to 10 pCi/L: act promptly, and confirm with a second short test rather than a long one.

Why Saint Augustine homes still need testing

There is a persistent myth that radon is a cold-climate, basement problem and that a slab-on-grade Florida home cannot have it. Radon does not care about the myth. It is produced by uranium decaying in the soil and rock beneath the house, and Florida's geology produces plenty of it. Elevated results have been documented in every region of the state.

A slab is not a seal. Radon enters through shrinkage cracks, expansion joints, the gaps around plumbing and conduit penetrations, and the perimeter where the slab meets the foundation. Your air conditioning, which slightly depressurizes the house, then helps draw it upward. This is also why your neighbor's clean result tells you almost nothing about your own home.

What happens if your result comes back high?

Nothing dramatic, and nothing urgent in the next-24-hours sense. Radon risk accumulates over years; it is not an acute poisoning. We give you the reading, explain what it means, and lay out the options, including doing nothing for now. If you decide to mitigate, a system typically installs in a single day and we retest afterward to confirm it worked. We do not upsell mitigation off a borderline number.

When you should test

• You have never tested. This is the big one. Most homes never have been.
• You are buying or selling. Florida requires a radon disclosure in residential sale contracts.
• You finished a renovation, added a room, or cut into the slab.
• You had a mitigation system installed. Retest to prove it works, then every two years after.
• It has been more than two years since your last test.

Why choose Saint Augustine Radon Pros?

We focus on one thing: radon mitigation for homeowners in Saint Augustineand the surrounding area. Call (904) 395-5498 and we will walk you through your options, what it costs, and how soon we can get to you.