Short-term kitKidde
442020 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 3 days
Locations and reports
Radon Levels in Lafayette Parish, Louisiana
EPA puts Lafayette Parish in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.0% of 201 (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
0.0%
0.4 pts below LA
- Lafayette Parish
- 0.0%
- Louisiana
- 0.4%
201 tests, 2022
Median result
0.2pCi/L
Below action level
- Lafayette Parish
- 0.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2022
Tests reported
201
4th of 9 by tests
- Lafayette Parish
- 201
- 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
2 of 9
Top quarter
- Lafayette Parish
- 0.0%
- Caddo Parish
- 1.9%
By share, of 9 with 30+ tests
Read a result for Lafayette Parish
Starts at Lafayette 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. Lafayette Parish's median reported result, 2022.
The data
Lafayette Parish, At a glance
Lafayette 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 Lafayette Parish, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 30.0% |
| 2015 | 22.2% |
| 2016 | 6.2% |
| 2017 | 26.7% |
| 2018 | 8.0% |
| 2019 | 2.3% |
| 2020 | 19.0% |
| 2021 | 14.3% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 30.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
These are the 201 tests reported to CDC for Lafayette 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).
Lafayette Parish, Compared
Lafayette Parish radon figures, compared
Calculated by Radon411Only 0 of 201 radon tests reported for Lafayette Parish in 2022 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 2.6 pCi/L.
Across 12 Louisiana counties pooled together, 0.4% of tests reached that level, so Lafayette Parish runs 0.4 points below its state. Against the national pool of 23.9%, the gap is 23.9 points lower. Its place in the state: 2nd 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 0.0% share point the same way here.
Below the action level, 198 tests (98.5%) came in under 2 pCi/L, against 98.1% statewide, and 3 tests (1.5%) fell between 2 and 4, against 1.5% statewide. Over 9 years of annual figures the share fell 30.0 points, from 30.0% in 2014 to 0.0% in 2022; its peak was 30.0% in 2014. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2019, with 651 tests reported; the quietest, 2020, had 63.
Lafayette ParishLouisiana, pooled
| Year | Tests | Lafayette Parish, at or above 4 pCi/L | Louisiana, pooled |
|---|---|---|---|
| 2014 | 120 | 30.0% | 10.5% |
| 2015 | 81 | 22.2% | 7.2% |
| 2016 | 291 | 6.2% | 2.0% |
| 2017 | 135 | 26.7% | 2.6% |
| 2018 | 75 | 8.0% | 0.5% |
| 2019 | 651 | 2.3% | 2.0% |
| 2020 | 63 | 19.0% | 0.8% |
| 2021 | 231 | 14.3% | 3.9% |
| 2022 | 201 | 0.0% | 0.4% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Lafayette Parish, Geology
The ground under Lafayette Parish
PredictedUSGS's geologic map puts all of Lafayette Parish's mapped land in one class: low radon potential. 98.3% of it lies in the area the map calls Terraces and Prairies, to which USGS gives a radon index of 8, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Terraces and Prairies | Clay, sandy clay, silt, sand, and some gravel. | Low | 8 | 98.3% |
| Floodplain | Alluvium, marsh, silt, and clay. | Low | 7 | 0.9% |
| Delta | Alluvium and marsh. | Low | 6 | 0.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Lafayette Parish beside the ground around it
Neither Lafayette Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 5 parishes that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Lafayette Parish, Local resources
Radon testing and mitigation in Lafayette 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
Lafayette Parish, Questions
Questions about radon in Lafayette Parish
Are radon levels high in Lafayette Parish?
In 2022, 0.0% of the radon tests reported to CDC for Lafayette Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Of 9 Louisiana counties with 30 or more tests for the same period, 1 reported a higher share; pooled, the state comes to 0.4%.
Which counties border Lafayette Parish?
Lafayette Parish borders 5 parishes: Acadia Parish, St. Martin Parish, Vermilion Parish, Iberia Parish and St. Landry Parish.
Products
Lafayette Parish, Products
Testing a home in Lafayette Parish
In Lafayette Parish, 0.0% of 201 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 Lafayette 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
RadonEye RD200 plug-in continuous radon monitor
- C-NRPP 2024/25: Approved
- Plug-in
- Bluetooth
- Alarm
- Screen, app
Method: Ion chamber
First reading: Within 10 minutes
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Lafayette Parish, Bordering parishes
Parishes bordering Lafayette Parish
Calculated by Radon411parishes bordering Lafayette Parish: 1 of 5
Lafayette Parish, Cities and towns
Cities and towns in Lafayette Parish
Lafayette Parish is growing: the Census Bureau puts it at 257,949 residents on July 1, 2025, up 6.5% from 242,176 in 2020. That works out to 960 people per square mile of land. Its largest town, Lafayette, has 123,311 residents, 47.8% of the total. Testing is reported here more often than across the state: CDC's 201 reported tests for 2022 come to 0.8 for every 1,000 residents (2025 estimate), against 0.4 for Louisiana.
From Lafayette to Duson, CDC publishes no figure by town: each reads Lafayette Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lafayette | 123,311 | +1.5% | 47.8% |
| Youngsville | 19,980 | +24.7% | 7.7% |
| Broussardextends beyond Lafayette Parish | 15,799 | +16.8% | Counted whole |
| Carencro | 13,224 | +41.8% | 5.1% |
| Scott | 9,635 | +17.9% | 3.7% |
| Dusonextends beyond Lafayette Parish | 1,357 | +0.9% | Counted whole |
6 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 Lafayette Parish is counted whole, so it has no share.
Lafayette Parish, Homes
Homes in Lafayette Parish
Of Lafayette Parish's 110,400 homes, 68% are detached houses, against 65% across Louisiana; 14% are in buildings of five or more homes. Half of its homes were built before 1988, close to Louisiana's 1982: 11% date from before 1960 and 36% from 2000 or later. 66% 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 | Lafayette Parish | Louisiana |
|---|---|---|
| Housing units | 110,400 | 2,094,002 |
| Detached houses | 68% | 65% |
| In buildings of 5 or more | 14% | 11% |
| Mobile homes | 10% | 13% |
| Built before 1960 | 11% | 19% |
| Built since 2000 | 36% | 27% |
| Middle year built | 1988 | 1982 |
| Owner-occupied | 66% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.