Short-term kit
Radon Short Term Test Kit short-term charcoal radon test kit, lab fee included
- Lab fee included
Method: Charcoal
In home: 2 to 7 days
Locations and reports
Radon Levels in Dyer County, Tennessee
EPA puts Dyer County in Zone 3, its lowest radon zone, and only 22 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
11.1%
Obion County
- Obion
- 11.1%
- Gibson
- 5.3%
2 of 7 neighbours have 30+ tests, 2008 to 2017
Nearest county
11.1%
Obion County, 25 miles
- Obion
- 11.1%
- Tennessee
- 33.3%
Share at 4+ pCi/L, 36 tests, 2008 to 2017
Ground above low
None
69.5 pts below Tennessee
- Dyer
- 0.0%
- Tennessee
- 69.5%
Share of land USGS rates moderate or high potential
Tests reported
23
Too few for a share
- Dyer
- 23
- Needed
- 30
2007 to 2016, laboratory
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Read a result for Dyer County
Starts at EPA's action level
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 4.0 pCi/L
At or above 4 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is at or above 4 pCi/L. EPA recommends fixing a home when the radon level is 4 pCi/L or higher.
The data
Dyer County, At a glance
Dyer County at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 100% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Dyer County, 2008 to 2017, laboratory
CDC holds 22 reported tests for Dyer County over the 2008 to 2017 laboratory totals, with a median of 1.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Dyer County beside the counties around it is how this page reads it.
What these figures count
Only 22 tests were reported to CDC for Dyer County over 2008 to 2017 (laboratory totals), and tests are often run on homes being sold or already suspected of a problem: so few describe neither the county nor this house.
Measured: CDC tracking data. Figure above: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).
Dyer County, Compared
Dyer County radon figures, compared
Calculated by Radon411CDC's largest figure for Dyer County rests on 23 tests over the 2007 to 2016 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 4.3 points and no rank or comparison is drawn from it. Results reached as high as 3.5 pCi/L, with a middle value of 1.4 pCi/L.
Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Obion County reported the largest share at or above 4 pCi/L, 11.1%, and Gibson County the smallest, 5.3%. Farther out, Tipton County (43 miles away) at 4.5%, Madison County (45 miles away) at 8.7% and Fayette County (59 miles away) at 11.1% have figures too. Pooled across 95 Tennessee counties, 33.3% of reported tests reached that level; across every county in the country with a figure, 35.7%.
Statewide for the same period, Jefferson County reported the highest share (56.8%) and Chester County the lowest (0.0%). EPA's 1993 map puts Dyer County in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 100% of the county's land low radon potential.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Dyer County, Geology
The ground under Dyer County
PredictedUSGS's geologic map puts all of Dyer County's mapped land in one class: low radon potential. The map puts 57.9% of Dyer County in the area it calls Loess-Covered Coastal Plain and 41.8% in Mississippi Alluvial Plain. USGS gives the first a radon index of 8 and the second 7, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Loess-Covered Coastal Plain | Cretaceous and younger marine and fluvial sand, clay, and marl covered with loess. | Low | 8 | 57.9% |
| Mississippi Alluvial Plain | Alluvial sand, silt, gravel, and clay. | Low | 7 | 41.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Dyer County beside the ground around it
Across Tennessee 47.2% of the land is rated high; none of Dyer County's is. None of the 7 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Dyer County, Local resources
Radon testing and mitigation in Dyer County
- Tennessee Radon ProgramTennessee Radon Program, run by Department of Environment & Conservation, offers free or discounted test kits, and answers questions about testing and mitigation in Tennessee.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
The Tennessee Radon Program provides free radon test kits and information assistance to residents, while also providing training opportunities to radon professionals across the state.
- Compare kits
- Professionals in Tennessee1 professional is listed in Tennessee.
What Tennessee's program says
- Phone
- 1-800-232-1139
- TDEC.Radon@tn.gov
What it means
Dyer County, Questions
Questions about radon in Dyer County
Are radon levels high in Dyer County?
Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Dyer County, Tennessee were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.4 pCi/L. Of the counties bordering it, 2 have a figure over the 2008 to 2017 laboratory totals: Obion County reported the largest share at or above 4 pCi/L, 11.1%, and Gibson County the smallest, 5.3%.
Which counties border Dyer County?
Dyer County borders 7 counties: Crockett County, TN, Lake County, TN, Pemiscot County, MO, Lauderdale County, TN, Obion County, TN, Gibson County, TN and Mississippi County, AR.
Products
Dyer County, Products
Testing a home in Dyer County
No CDC figure names Dyer County; the nearest county with one, Obion County (25 miles away), reported 11.1% of its tests at or above 4 pCi/L over the 2008 to 2017 laboratory totals, the only reading nearby until a test of this home. Zone 3 is the lowest label, yet homes at or above 4 pCi/L occur in every zone: a short-term kit (2 to 90 days) is the quick first check in Dyer County.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL116 long-term radon test kit
- Lab fee extra
Method: Alpha track
In home: 90 days to 12 months
MonitorINKBIRD
INK-RD3 battery radon monitor with an e-ink screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Dyer County, Bordering counties
Counties bordering Dyer County
Calculated by Radon411- Radon levels in Mississippi County, AREPA zone 3
75.0%at or above 4 pCi/L
Median 9.8 pCi/L · 4 tests
- Radon levels in Crockett County, TNEPA zone 3
21.1%at or above 4 pCi/L
Median 1.2 pCi/L · 19 tests
- Radon levels in Lauderdale County, TNEPA zone 3
11.1%at or above 4 pCi/L
Median 1.3 pCi/L · 9 tests
- Radon levels in Obion County, TNEPA zone 3
11.1%at or above 4 pCi/L
Median 1.8 pCi/L · 36 tests
- Radon levels in Gibson County, TNEPA zone 3
5.3%at or above 4 pCi/L
Median 1.0 pCi/L · 57 tests
- Radon levels in Lake County, TNEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 7 tests
- Radon levels in Pemiscot County, MOEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 5 tests
Dyer County, Cities and towns
Cities and towns in Dyer County
About 36,320 people live in Dyer County by the Census Bureau's estimate for July 1, 2025, 390 fewer than in 2020 (−1.1%). That works out to 71 people per square mile of land. Its largest town, Dyersburg, has 15,906 residents, 43.8% of the total. Reported testing is thin here: 23 tests over 2007 to 2016, or 0.6 for every 1,000 residents (2025 estimate), where Tennessee as a whole comes to 4.0.
From Dyersburg to Trimble, CDC publishes no figure by town: each reads Dyer County's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Dyersburg | 15,906 | −1.4% | 43.8% |
| Newbern | 3,222 | −3.4% | 8.9% |
| Trimbleextends beyond Dyer County | 533 | −2.0% | Counted whole |
3 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). A place that extends beyond Dyer County is counted whole, so it has no share.
Dyer County, Homes
Homes in Dyer County
Dyer County is a place of houses on their own lots: 78% of its 16,296 homes are detached single-family houses, against 68% across Tennessee. The homes are older than Tennessee's as a whole: half were built before 1977 (1986 for Tennessee), and 25% date from before 1960. 62% of occupied homes are lived in by their owner (Tennessee: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Dyer County | Tennessee |
|---|---|---|
| Housing units | 16,296 | 3,095,472 |
| Detached houses | 78% | 68% |
| In buildings of 5 or more | 5% | 14% |
| Mobile homes | 8% | 8% |
| Built before 1960 | 25% | 18% |
| Built since 2000 | 17% | 29% |
| Middle year built | 1977 | 1986 |
| Owner-occupied | 62% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.