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 De Soto Parish, Louisiana
EPA puts De Soto Parish in Zone 3, its lowest radon zone, and only 3 radon tests from it are on file with CDC (2019). Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
0.0%
0.5 pts below LA
- De Soto Parish
- 0.0%
- Louisiana
- 0.5%
84 tests, 2018
Median result
0.2pCi/L
Below action level
- De Soto Parish
- 0.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2018
Tests reported
84
9th of 12 by tests
- De Soto Parish
- 84
- Jefferson Parish
- 504
Reported to CDC before any fix, 2018
EPA radon zone
Zone 3
Lower potential
- 1
- 2
- Zone 3
1 highest, 3 lowest
EPA predicts under 2 pCi/L indoors
Rank in Louisiana
2 of 12
Top quarter
- De Soto Parish
- 0.0%
- Lafayette Parish
- 8.0%
By share, of 12 with 30+ tests
Read a result for De Soto Parish
Starts at De Soto Parish's median, 0.2 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.2 pCi/L
Below 2 pCi/L
- Under 20 to 1.9 pCi/L
- 2 to 4consider a fix
- 4 and aboveEPA says fix it
This result is below 2 pCi/L, the level at which EPA says a fix should be considered. De Soto Parish's median reported result, 2018.
The data
De Soto Parish, At a glance
De Soto Parish 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 De Soto Parish, 2019
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
2019: 0.0%. Across these years the share ran from 0.0% to 0.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for De Soto Parish over 2019, and tests are often run on homes being sold or already suspected of a problem: so few describe neither the parish nor this house.
Measured: CDC tracking data. Figure above: 2019. Measured data period: 2005 to 2019 (every CDC figure on file).
De Soto Parish, Compared
De Soto Parish radon figures, compared
Calculated by Radon411Only 0 of 84 radon tests reported for De Soto Parish in 2018 reached 4 pCi/L (0.0%). The median result, 0.2 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 0.7 pCi/L.
The newest figure, in 2019, counts only 3 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 84-test figure.
Across 28 Louisiana counties pooled together, 0.5% of tests reached that level, so De Soto Parish runs 0.5 points below its state. Against the national pool of 29.1%, the gap is 29.1 points lower. Its place in the state: 2nd of 12 Louisiana counties with 30 or more tests for the same period.
Zone 3 on EPA's map (predicted average under 2 pCi/L) and a 0.0% share point the same way here. Of 2 neighbours with a figure, all 2 reported a larger share at or above 4 pCi/L; the spread is 0.0% (Caddo Parish) to 0.0% (Red River Parish).
Below the action level, 84 tests (100.0%) came in under 2 pCi/L, against 97.2% statewide, and 0 tests (0.0%) fell between 2 and 4, against 2.3% statewide. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2018, with 84 tests reported; the quietest, 2019, had 3.
Pooled shares: Radon411's sum of CDC's county counts for one period.
De Soto Parish, Geology
The ground under De Soto Parish
PredictedUSGS's geologic map puts all of De Soto Parish's mapped land in one class: low radon potential. All of it lies in the area the map calls Old Uplands, to which USGS gives a radon index of 7, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Old Uplands | Clays, silts, sands, and ironstone. | Low | 7 | 99.9% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
De Soto Parish beside the ground around it
Neither De Soto Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 6 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
De Soto Parish, Local resources
Radon testing and mitigation in De Soto Parish
- Louisiana's radon programLouisiana Department of Environmental QualityLouisiana's radon program answers questions about testing, mitigation and the rules in Louisiana.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsAsk the program whether it has free or discounted kits, or compare kits you can buy.
- Compare kits
- See the Louisiana directoryNo professionals are listed in Louisiana yet. The state program can point you to registered testers and mitigators.
What it means
De Soto Parish, Questions
Questions about radon in De Soto Parish
Are radon levels high in De Soto Parish?
In 2019, 0.0% of the radon tests reported to CDC for De Soto Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.8 pCi/L. Of 12 Louisiana counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 0.5%.
Which counties border De Soto Parish?
De Soto Parish borders 6 counties: Red River Parish, LA, Shelby County, TX, Panola County, TX, Caddo Parish, LA, Natchitoches Parish, LA and Sabine Parish, LA.
Products
De Soto Parish, Products
Testing a home in De Soto Parish
In De Soto Parish, 0.0% of 84 tests reported to CDC in 2018 reached 4 pCi/L, against 0.5% pooled across Louisiana. 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 De Soto Parish.
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
Monitor
Corentium Home battery digital radon detector
- C-NRPP 2024/25: Approved
- Battery
- Screen
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
De Soto Parish, Bordering counties
Counties bordering De Soto Parish
Calculated by Radon411- Radon levels in Red River Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 102 tests · 0.0 points above De Soto Parish
- Radon levels in Caddo Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.2 pCi/L · 111 tests · 0.0 points above De Soto Parish
- Radon levels in Shelby County, TXEPA zone 3
No CDC figure for 2018; its page reads it against its own neighbours.
- Radon levels in Panola County, TXEPA zone 3
No CDC figure for 2018; its page reads it against its own neighbours.
- Radon levels in Natchitoches Parish, LAEPA zone 3
No CDC figure for 2018; its page reads it against its own neighbours.
- Radon levels in Sabine Parish, LAEPA zone 3
No CDC figure for 2018; its page reads it against its own neighbours.
De Soto Parish, Cities and towns
Cities and towns in De Soto Parish
The Census Bureau estimates 27,381 residents in De Soto Parish for July 1, 2025, 541 more than in 2020 (+2.0%). That works out to 31 people per square mile of land. No town dominates: Mansfield, the largest, has 4,475 residents, 16.3% of the total. Together its 8 incorporated places hold 34.9% of those residents; the other 65.1% live outside any of them. Testing is reported here more often than across the state: CDC's 84 reported tests for 2018 come to 3.1 for every 1,000 residents (2025 estimate), against 0.5 for Louisiana.
From Mansfield to Longstreet, CDC publishes no figure by town: each reads De Soto Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Mansfield | 4,475 | −4.5% | 16.3% |
| Stonewall | 2,716 | +15.6% | 9.9% |
| Logansport | 1,325 | −0.5% | 4.8% |
| South Mansfield | 344 | +0.6% | 1.3% |
| Keachi | 246 | +2.1% | 0.9% |
| Grand Cane | 213 | −1.4% | 0.8% |
| Stanley | 126 | +0.8% | 0.5% |
| Longstreet | 122 | +2.5% | 0.4% |
8 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).
De Soto Parish, Homes
Homes in De Soto Parish
Of De Soto Parish's 12,560 homes, 56% are detached houses, against 65% across Louisiana; 33% are mobile homes. Half of its homes were built before 1989, close to Louisiana's 1982: 12% date from before 1960 and 35% from 2000 or later. Owners live in 75% of the occupied homes (Louisiana: 67%), so for most households a test and a fix are their own to order.
| Homes | De Soto Parish | Louisiana |
|---|---|---|
| Housing units | 12,560 | 2,094,002 |
| Detached houses | 56% | 65% |
| In buildings of 5 or more | 2% | 11% |
| Mobile homes | 33% | 13% |
| Built before 1960 | 12% | 19% |
| Built since 2000 | 35% | 27% |
| Middle year built | 1989 | 1982 |
| Owner-occupied | 75% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.