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Radon Levels in Lauderdale County, Alabama

EPA puts Lauderdale County in Zone 1, its highest radon zone, and 27.2% of its 1,885 reported radon tests (2008 to 2017, laboratory totals) were at or above 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Share at 4+ pCi/L

    27.2%

    5.3 pts above AL

    Lauderdale
    27.2%
    Alabama
    21.9%

    1,885 tests, 2008 to 2017

  • Median result

    2.2pCi/L

    Below action level

    Lauderdale
    2.2 pCi/L
    EPA
    4.0 pCi/L

    Midpoint of the tests, 2008 to 2017

  • Tests reported

    1,885

    2nd of 27 by tests

    Lauderdale
    1,885
    Madison
    5,178

    Reported to CDC before any fix, 2008 to 2017

  • EPA radon zone

    Zone 1

    Highest potential

    1. Zone 1
    2. 2
    3. 3

    1 highest, 3 lowest

    EPA predicts over 4 pCi/L indoors

  • Rank in Alabama

    2 of 27

    Top quarter

    Lauderdale
    27.2%
    Colbert
    36.2%

    By share, of 27 with 30+ tests

Read a result for Lauderdale County

Starts at Lauderdale County's median, 2.2 pCi/L

2.2pCi/L

EPA’s own thresholds; the figures are the area’s, never this home’s.

EPA’s reading of 2.2 pCi/L

Between 2 and 4 pCi/L

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 4 and aboveEPA says fix it

This result is between 2 and 4 pCi/L. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. Lauderdale County's median reported result, 2008 to 2017.

Interpret this readingWhat a fix costs

The data

Lauderdale County, At a glance

Lauderdale County at a glance

Predicted: EPA radon zone

EPA Zone 1: highest predicted potential

EPA puts all of Lauderdale County in and predicts an average indoor of greater than 4 pCi/L (greater than 150 Bq/m³) across the county. That is one forecast for the whole county, not a reading of any address in it; homes above EPA's turn up in all three zones.

USGS geologic potential: High across 88% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Lauderdale County, 2008 to 2017, laboratory

Reported results by concentration band, Lauderdale County, 2008 to 2017, laboratory
Under 2 pCi/L: 46%2 to 4 pCi/L: 27%4 pCi/L and above: 27%

Of 1,885 pre-mitigation tests reported to CDC, not homes in this area.

Reported results by concentration band, Lauderdale County, 2008 to 2017, laboratory: data table
Result bandTests MeasuredShare Measured
Under 2 pCi/L86345.8%
2 to 4 pCi/L51027.1%
4 pCi/L and above51227.2%
What these figures count

These are the 1,885 tests reported to CDC for Lauderdale County over 2008 to 2017 (laboratory totals), many from homes being sold or already suspected of a problem: they describe the county's reported tests, not this house.

Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Lauderdale County, Compared

Lauderdale County radon figures, compared

Calculated by Radon411

Lauderdale County's 1,885 reported tests over the 2008 to 2017 laboratory totals had a middle value of 2.2 pCi/L and a maximum of 76.0 pCi/L, and 27.2% reached 4 pCi/L. Alabama as a whole (65 Alabama counties, pooled) comes to 21.9%: 5.3 points lower than here.

Among its state's counties it ranks 2nd of 27 Alabama counties with 30 or more tests for the same period. Statewide for the same period, Colbert County reported the highest share (36.2%) and Baldwin County the lowest (0.0%).

Below the action level, 863 tests (45.8%) came in under 2 pCi/L, against 54.3% statewide, and 510 tests (27.1%) fell between 2 and 4, against 23.8% statewide. CDC's ten-year totals for Lauderdale County went from 2,103 tests (2005 to 2014) to 1,885 (2008 to 2017), the share going from 26.5% to 27.2%.

EPA's 1993 zone map puts Lauderdale County in Zone 1, a predicted county average above 4 pCi/L. USGS geology rates 88% of the county's land high radon potential.

Next door, the shares run from 7.9% in Hardin County, TN to 40.7% in Giles County, TN, with Lawrence County, TN, Lawrence County and Limestone County below Lauderdale County.

CDC also counts 11 tests taken after mitigation in Lauderdale County for the same period: tests in homes where a fix was already in.

Lauderdale County against Alabama, the United States and nearby counties, 2008 to 2017, laboratory
AreaTestsAt or above 4 pCi/LMedianDifference from Lauderdale County
Lauderdale County1,88527.2%2.2 pCi/LThis county
Alabama, pooled65 counties, pooled12,56921.9%Not pooled−5.3 points
United States, pooled2,661 counties, pooled2,013,54435.7%Not pooled+8.5 points
Madison Countyhighest in the state5,17825.2%1.9 pCi/L−2.0 points
Baldwin Countylowest in the state310.0%1.0 pCi/L−27.2 points
Giles County, TNborders it14040.7%3.3 pCi/L+13.5 points
Colbert County, ALborders it87136.2%2.7 pCi/L+9.0 points
Lawrence County, TNborders it13621.3%1.6 pCi/L−5.9 points
Lawrence County, ALborders it15416.2%1.7 pCi/L−11.0 points
Limestone County, ALborders it67410.1%1.3 pCi/L−17.1 points
Hardin County, TNborders it387.9%1.0 pCi/L−19.3 points
Wayne County, TNborders it267.7%1.7 pCi/L−19.5 points
Where Lauderdale County's reported results fell, 2008 to 2017, laboratory, beside Alabama and the United States
ResultLauderdale County testsLauderdale County shareAlabama shareU.S. shareAgainst Alabama
Under 2 pCi/L86345.8%54.3%39.6%−8.5 points
2 to 4 pCi/L51027.1%23.8%24.7%+3.3 points
4 pCi/L and above51227.2%21.9%35.7%+5.3 points
Lauderdale County ranked among the 27 Alabama counties with 30 or more tests, by share at or above 4 pCi/L, 2008 to 2017, laboratory
CountyRankTestsAt or above 4 pCi/LMedian
Colbert County1 of 2787136.2%2.7 pCi/L
Lauderdale County2 of 271,88527.2%2.2 pCi/L
Madison County3 of 275,17825.2%1.9 pCi/L
Elmore County4 of 273622.2%1.2 pCi/L
Etowah County5 of 275619.6%1.4 pCi/L
Calhoun County6 of 2723818.9%1.4 pCi/L
Cleburne County7 of 276918.8%1.5 pCi/L
Talladega County8 of 2712418.5%1.6 pCi/L
Franklin County9 of 2719318.1%1.4 pCi/L
Clay County10 of 273917.9%0.9 pCi/L
Jackson County11 of 2722317.5%1.5 pCi/L
Lauderdale County ten-year laboratory totals, against Alabama's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestAlabama, pooledChange from the row before
2008 to 20171,88527.2%2.2 pCi/L76.0 pCi/L21.9%+0.3 points
2007 to 20161,94326.9%2.2 pCi/L76.0 pCi/L22.0%−0.2 points
2006 to 20152,02827.1%2.1 pCi/L76.0 pCi/L22.0%+0.6 points
2005 to 20142,10326.5%2.1 pCi/L76.0 pCi/L22.4%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Lauderdale County, Geology

The ground under Lauderdale County

Predicted

Most of the ground under Lauderdale County is one class on USGS's geologic map: 87.8% of its land is high radon potential, with 12.2% low. The map puts 87.4% of Lauderdale County in the area it calls Interior Low Plateaus and 12.2% in Tombigbee Hills. USGS gives the first a radon index of 12, in the high band (12 to 17), and the second 8, in the low band (5 to 8).

USGS's geologic areas under Lauderdale County
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
Interior Low PlateausMississippian carbonate rocks and shales.High1287.4%
Tombigbee HillsClay, sand, sandstone, chalk, chalky marl, quartzose, chert gravels, and quartz sand.Low812.2%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Lauderdale County beside the ground around it

Lauderdale County has more high-potential ground than Alabama as a whole: 87.8% of its land against 14.3%. Of the 8 counties that border it, 4 have more high-potential ground, Lawrence County, TN the most at 100%.

Share of land by USGS radon potential: Lauderdale County, the 8 counties bordering it and Alabama
AreaEPA zoneLow potentialModerate potentialHigh potential
Lauderdale CountyZone 112.2%None87.8%
Colbert CountyZone 1None1.5%98.5%
Wayne County, TNZone 123.3%None76.7%
Lawrence County, TNZone 1NoneNone100%
Limestone CountyZone 1NoneNone100%
Lawrence CountyZone 1None28.9%71.1%
Hardin County, TNZone 242.4%14.9%42.7%
Tishomingo County, MSZone 380.5%2.9%16.5%
Giles County, TNZone 1None0.1%99.9%
Alabama67 counties, pooled by land areaVaries35.2%50.4%14.3%

The map rates the ground, not the air in any home.

Local help

Lauderdale County, Local resources

Radon testing and mitigation in Lauderdale County

What Alabama's program says
Phone
(334) 290-6244

What it means

Lauderdale County, Questions

Questions about radon in Lauderdale County

Are radon levels high in Lauderdale County?

Over the 2008 to 2017 laboratory totals, 27.2% of the radon tests reported to CDC for Lauderdale County, Alabama were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.2 pCi/L. Of 27 Alabama counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 21.9%.

Which counties border Lauderdale County?

Lauderdale County borders 8 counties: Colbert County, AL, Wayne County, TN, Lawrence County, TN, Limestone County, AL, Lawrence County, AL, Hardin County, TN, Tishomingo County, MS and Giles County, TN.

Products

Lauderdale County, Products

Testing a home in Lauderdale County

In Lauderdale County, 27.2% of 1,885 tests reported to CDC over the 2008 to 2017 laboratory totals reached 4 pCi/L, against 21.9% pooled across Alabama. In Zone 1 the year-round level in Lauderdale County is the one to know: a long-term test (more than 90 days) or a monitor, with a short-term kit for a first answer.

Test kits and monitors3

See every kit and monitor

Lauderdale County is in EPA Zone 1, the highest predicted radon potential. Best radon monitors for Zone 1 counties like Lauderdale County

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Lauderdale County, Bordering counties

Counties bordering Lauderdale County

Calculated by Radon411

Lauderdale County, Cities and towns

Cities and towns in Lauderdale County

The Census Bureau estimates 97,135 residents in Lauderdale County for July 1, 2025, 3,103 more than in 2020 (+3.3%). That works out to 145 people per square mile of land. Its largest town, Florence, has 42,581 residents, 43.8% of the total. Together its 7 incorporated places hold 48.4% of those residents; the other 51.6% live outside any of them. Testing is reported here more often than across the state: CDC's 1,885 reported tests for 2008 to 2017 come to 19.4 for every 1,000 residents (2025 estimate), against 2.4 for Alabama.

From Florence to Waterloo, CDC publishes no figure by town: each reads Lauderdale County's.

The cities and towns in Lauderdale County by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Florence42,581+4.9%43.8%
Rogersville1,434+11.4%1.5%
Killen1,039+1.3%1.1%
St. Florian748+20.6%0.8%
Lexington735+1.0%0.8%
Anderson257+1.6%0.3%
Waterloo183+1.1%0.2%

7 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. Residents: U.S. Census Bureau population estimates for July 1, 2025 (Vintage 2025).

Lauderdale County, Homes

Homes in Lauderdale County

Of Lauderdale County's 44,801 homes, 71% are detached houses, against 69% across Alabama; 13% are in buildings of five or more homes. Half of its homes were built before 1980, close to Alabama's 1985: 19% date from before 1960 and 20% from 2000 or later. 68% of occupied homes are lived in by their owner (Alabama: 70%); in the rest a tenant can run a test, but a fix is the landlord's to make.

Homes in Lauderdale County, Alabama, 2019 to 2023
HomesLauderdale CountyAlabama
Housing units44,8012,316,192
Detached houses71%69%
In buildings of 5 or more13%12%
Mobile homes9%13%
Built before 196019%16%
Built since 200020%27%
Middle year built19801985
Owner-occupied68%70%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.