Radon Testing & Mitigation in Athens and Limestone County, AL

Limestone County sits just west of Madison County, and the line between them is easy to miss. The City of Huntsville extends into Limestone County, including the area around the Mazda Toyota plant, and the City of Madison's western neighborhoods cross into it too. Athens, the county seat, has grown quickly along Highway 72 and I-65, and new subdivisions now fill much of the land between Athens and Madison. If you live anywhere in that corridor, radon testing matters just as much as it does in Huntsville. Many of the certified professionals who serve Huntsville also work in Limestone County, and we can usually match you with one. We're a free referral service, not a contractor.

What the data says

The EPA puts Limestone County in Zone 1, the highest of its three radon potential categories, and the Alabama Department of Public Health (ADPH) lists Limestone among the state's 15 counties with the highest potential for elevated radon. Neighboring Madison, Morgan and Lawrence counties are on that list too.

Actual test data is thinner. CDC tracking data for 2008 to 2017 shows 501 Limestone County buildings tested by national labs, with a median result of 1.3 pCi/L and 10.1% at or above the EPA action level of 4 pCi/L. Madison County, by comparison, had 2,959 buildings tested over the same period, with a median of 1.9 pCi/L and 25.2% at or above 4. Lower numbers don't mean Limestone homes are safe. Far fewer homes there were tested, the owners who tested chose to, and ADPH notes that north Alabama's karst geology makes radon highly variable from house to house. One in ten tested buildings at or above the action level is still a lot of homes.

Housing in Athens and the Limestone corridor

New construction

Much of the growth around Athens, Belle Mina, Tanner and east Limestone is new slab-on-grade construction. Slab homes are usually the simplest to fix with a sub-slab system. If your builder installed a passive radon pipe, a fan can often be added; see adding a fan to a passive system. If you're building now, it's far cheaper to add radon-resistant features before the slab is poured.

Older Athens homes

Older homes in and around downtown Athens include crawl spaces and some basements. Crawl spaces usually need a sealed sub-membrane system.

Rural property and wells

Some rural Limestone County properties use private wells. If your air test is high and you're on a well, a water test helps confirm whether water is part of the source.

Want a certified pro to look at your home?Free, no-obligation call. We connect you with an independent Huntsville-area radon specialist.

Call (256) 384-5831

Testing tips for Limestone County

Free kit: ADPH announced in January 2026 that it's offering one free radon test kit per Alabama household while supplies last. You pay return postage, almost $5 by first-class mail.
Placement: the lowest level you regularly use, at breathing height, away from drafts, kitchens and bathrooms.
Closed-house conditions: windows and outside doors closed for 12 hours before and during a short-term test.
Confirm before you spend: unless you're in a real estate deal, ADPH advises basing a mitigation decision on follow-up tests, not one short-term screening test.
Retest: every two years in an unmitigated home, and before and after major renovations.

Buying in Athens or east Limestone

Radon tests show up in many north Alabama purchase inspections, including relocations for jobs in Huntsville and at the newer manufacturing plants in the county. A professional test with a continuous monitor fits inside a typical inspection window and gives an hour-by-hour record. See our real estate radon guide for timing and who usually pays.

Permits

Which permit office applies depends on your address: the City of Athens, the City of Huntsville for addresses in its Limestone County portion, the City of Madison for its west side, or Limestone County for unincorporated property. Most radon permits come down to the fan's electrical connection. Ask your installer which office applies and whether the fee is in the quote.

Costs

EPA guidance puts most radon reduction systems at about $800 to $2,500, and Angi's 2026 data puts a standard active system at about $805 to $1,326. Each professional quotes your home after seeing it. Our cost guide explains what moves the price.

Frequently asked questions

Is Limestone County, Alabama high in radon?

The EPA puts Limestone County in Zone 1, the highest-potential category, and ADPH lists it among Alabama's 15 highest-potential counties. CDC lab data shows 10.1% of 501 tested buildings at or above 4 pCi/L. Test your own home to know.

Do you serve Athens, AL?

We take calls from Athens and the rest of Limestone County. The professionals we refer are independent and set their own service areas, so tell us your ZIP code and we'll match you with someone who covers it.

Why are Limestone County's radon numbers lower than Madison County's?

Partly because far fewer homes have been tested, and the ones that were aren't a random sample. The geology also varies. County figures can't predict any one house.

Can a new home in Athens have radon?

Yes. Tight new construction can trap radon. Unless the builder installed and activated a radon system, test a new home like any other.