Short-term kit
RA400 short-term liquid scintillation radon test kit, lab fee included
- Lab fee included
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Caddo Parish, Louisiana
EPA puts Caddo Parish in Zone 3, its lowest radon zone, and most reported tests there come back low, though 1.9% of 486 (2022) reached 4 pCi/L. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Share at 4+ pCi/L
1.9%
1.5 pts above LA
- Caddo Parish
- 1.9%
- Louisiana
- 0.4%
486 tests, 2022
Median result
0.4pCi/L
Below action level
- Caddo Parish
- 0.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
486
Most tested in Louisiana
- Caddo Parish
- 486
Reported to CDC before any fix, 2022
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
1 of 9
Top quarter
- Caddo Parish
- 1.9%
- Caddo Parish
- 1.9%
By share, of 9 with 30+ tests
Read a result for Caddo Parish
Starts at Caddo Parish's median, 0.4 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.4 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. Caddo Parish's median reported result, 2022.
The data
Caddo Parish, At a glance
Caddo 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 Caddo Parish, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2016 | 3.6% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 3.9% |
| 2020 | 1.3% |
| 2021 | 20.1% |
| 2022 | 1.9% |
2022: 1.9%. Across these years the share ran from 0.0% to 20.1%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 486 tests reported to CDC for Caddo Parish over 2022, many from homes being sold or already suspected of a problem: they describe the parish's reported tests, not this house.
Measured: CDC tracking data. Figure above: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Caddo Parish, Compared
Caddo Parish radon figures, compared
Calculated by Radon411Only 9 of 486 radon tests reported for Caddo Parish in 2022 reached 4 pCi/L (1.9%). The median result, 0.4 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 9.6 pCi/L.
Across 12 Louisiana counties pooled together, 0.4% of tests reached that level, so Caddo Parish runs 1.5 points above its state. Against the national pool of 23.9%, the gap is 22.0 points lower. Its place in the state: 1st of 9 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 1.9% share point the same way here.
Below the action level, 456 tests (93.8%) came in under 2 pCi/L, against 98.1% statewide, and 21 tests (4.3%) fell between 2 and 4, against 1.5% statewide. Over 8 years of annual figures the share held within 2 points, from 0.0% in 2015 to 1.9% in 2022; its peak was 20.1% in 2021. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2019, with 537 tests reported; the quietest, 2015, had 30.
Caddo ParishLouisiana, pooled
| Year | Tests | Caddo Parish, at or above 4 pCi/L | Louisiana, pooled |
|---|---|---|---|
| 2015 | 30 | 0.0% | 7.2% |
| 2016 | 84 | 3.6% | 2.0% |
| 2017 | 435 | 0.0% | 2.6% |
| 2018 | 111 | 0.0% | 0.5% |
| 2019 | 537 | 3.9% | 2.0% |
| 2020 | 225 | 1.3% | 0.8% |
| 2021 | 477 | 20.1% | 3.9% |
| 2022 | 486 | 1.9% | 0.4% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Caddo Parish, Geology
The ground under Caddo Parish
PredictedUSGS's geologic map puts all of Caddo 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Caddo Parish beside the ground around it
Neither Caddo Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 8 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Caddo Parish, Local resources
Radon testing and mitigation in Caddo 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
Caddo Parish, Questions
Questions about radon in Caddo Parish
Are radon levels high in Caddo Parish?
In 2022, 1.9% of the radon tests reported to CDC for Caddo Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.4 pCi/L. Of 9 Louisiana counties with 30 or more tests for the same period, none reported a higher share; pooled, the state comes to 0.4%.
Which counties border Caddo Parish?
Caddo Parish borders 8 counties: Bossier Parish, LA, Harrison County, TX, Marion County, TX, De Soto Parish, LA, Panola County, TX, Cass County, TX, Miller County, AR and Red River Parish, LA.
Products
Caddo Parish, Products
Testing a home in Caddo Parish
In Caddo Parish, 1.9% of 486 tests reported to CDC in 2022 reached 4 pCi/L, against 0.4% 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 Caddo Parish.
Test kits and monitors3
See every kit and monitor
Long-term kit
RL416 long-term radon test kit, lab fee included
- Lab fee included
Method: Alpha track
In home: 90 days to 12 months
Monitor
RadonPro Wi-Fi radon monitor with a built-in Geiger counter
- C-NRPP 2024/25: Not included
- Plug-in
- Wi-Fi
- Alarm
- Screen, app
First reading: Within 5 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Caddo Parish, Bordering counties
Counties bordering Caddo Parish
Calculated by Radon411counties bordering Caddo Parish: 1 of 8
Caddo Parish, Cities and towns
Cities and towns in Caddo Parish
Caddo Parish has been losing residents: from 237,024 in 2020 to 224,226 on July 1, 2025, a fall of 5.4% by the Census Bureau's estimates. That works out to 255 people per square mile of land. Shreveport, the largest place on its list (175,902 residents in all), extends beyond Caddo Parish, so no share of the total is worked out for it. Testing is reported here more often than across the state: CDC's 486 reported tests for 2022 come to 2.2 for every 1,000 residents (2025 estimate), against 0.4 for Louisiana.
From Shreveport to Gilliam, CDC publishes no figure by town: each reads Caddo Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Shreveportextends beyond Caddo Parish | 175,902 | −5.8% | Counted whole |
| Blanchard | 3,360 | −5.3% | 1.5% |
| Greenwood | 3,077 | −2.4% | 1.4% |
| Vivian | 2,920 | −4.5% | 1.3% |
| Oil City | 874 | −2.5% | 0.4% |
| Mooringsport | 705 | −5.5% | 0.3% |
| Belcher | 240 | −3.6% | 0.1% |
| Hosston | 235 | −2.5% | 0.1% |
| Ida | 209 | −5.4% | Under 0.1% |
| Rodessa | 182 | −2.2% | Under 0.1% |
| Gilliam | 116 | −4.9% | Under 0.1% |
11 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 Caddo Parish is counted whole, so it has no share.
Caddo Parish, Homes
Homes in Caddo Parish
Of Caddo Parish's 112,568 homes, 68% are detached houses, against 65% across Louisiana; 13% are in buildings of five or more homes. Half of its homes were built before 1975, close to Louisiana's 1982: 24% date from before 1960 and 17% from 2000 or later. 61% of occupied homes are lived in by their owner (Louisiana: 67%); in the rest a tenant can run a test, but a fix is the landlord's to make.
| Homes | Caddo Parish | Louisiana |
|---|---|---|
| Housing units | 112,568 | 2,094,002 |
| Detached houses | 68% | 65% |
| In buildings of 5 or more | 13% | 11% |
| Mobile homes | 9% | 13% |
| Built before 1960 | 24% | 19% |
| Built since 2000 | 17% | 27% |
| Middle year built | 1975 | 1982 |
| Owner-occupied | 61% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.