Short-term kit
PicoCan short-term charcoal canister radon test
- Lab fee included
Method: Charcoal
In home: 48 to 96 hours
Locations and reports
Radon Levels in St. Landry Parish, Louisiana
EPA puts St. Landry Parish in Zone 3, its lowest radon zone, and only 6 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
Nearest county
0.0%
East Baton Rouge Parish, 54 miles
- East Baton Rouge Parish
- 0.0%
- Louisiana
- 2.8%
Share at 4+ pCi/L, 48 tests, 2006 to 2015
Ground above low
None
Level with Louisiana
- St. Landry Parish
- 0.0%
- Louisiana
- 0.0%
Share of land USGS rates moderate or high potential
Tests reported
12
Too few for a share
- St. Landry Parish
- 12
- Needed
- 30
2015
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 St. Landry Parish
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
St. Landry Parish, At a glance
St. Landry 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 St. Landry Parish, 2019
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2015 | 0.0% |
| 2018 | 0.0% |
| 2019 | 100.0% |
2019: 100.0%. Across these years the share ran from 0.0% to 100.0%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for St. Landry 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).
St. Landry Parish, Compared
St. Landry Parish radon figures, compared
Calculated by Radon411CDC's largest figure for St. Landry Parish rests on 12 tests in 2015, 0 of them at or above 4 pCi/L, so each test moves its share by 8.3 points and no rank or comparison is drawn from it. Results reached as high as 2.8 pCi/L, with a middle value of 0.3 pCi/L.
The nearest counties with a figure are East Baton Rouge Parish (54 miles away) at 0.0%, Calcasieu Parish (85 miles away) at 0.0% and Tangipahoa Parish (95 miles away) at 0.0%. Pooled across 37 Louisiana counties, 2.8% of reported tests reached that level; across every county in the country with a figure, 36.3%.
Statewide for the same period, Jefferson Parish reported the highest share (1.5%) and Tangipahoa Parish the lowest (0.0%). EPA's 1993 map puts St. Landry Parish 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.
St. Landry Parish, Geology
The ground under St. Landry Parish
PredictedUSGS's geologic map puts all of St. Landry Parish's mapped land in one class: low radon potential. The map puts 58.9% of St. Landry Parish in the area it calls Floodplain and 41.1% in Terraces and Prairies. USGS gives the first a radon index of 7 and the second 8, both in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Floodplain | Alluvium, marsh, silt, and clay. | Low | 7 | 58.9% |
| Terraces and Prairies | Clay, sandy clay, silt, sand, and some gravel. | Low | 8 | 41.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
St. Landry Parish beside the ground around it
Neither St. Landry Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 6 parishes that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
St. Landry Parish, Local resources
Radon testing and mitigation in St. Landry 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
St. Landry Parish, Questions
Questions about radon in St. Landry Parish
Are radon levels high in St. Landry Parish?
In 2019, 100.0% of the radon tests reported to CDC for St. Landry Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 5.3 pCi/L. Of the 4 nearest counties with a figure, within 126 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 1.5%.
Which counties border St. Landry Parish?
St. Landry Parish borders 6 parishes: Pointe Coupee Parish, St. Martin Parish, Evangeline Parish, Lafayette Parish, Avoyelles Parish and Acadia Parish.
Products
St. Landry Parish, Products
Testing a home in St. Landry Parish
No CDC figure names St. Landry Parish; the nearest county with one, East Baton Rouge Parish (54 miles away), reported 0.0% of its tests at or above 4 pCi/L over the 2006 to 2015 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 St. Landry 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
MonitorAranet
Radon Plus battery digital radon monitor with an e-ink screen
- C-NRPP 2024/25: Approved
- Battery
- 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
St. Landry Parish, Bordering parishes
Parishes bordering St. Landry Parish
Calculated by Radon411- Radon levels in Lafayette ParishEPA zone 3
4.8%at or above 4 pCi/L
Median 0.7 pCi/L · 21 tests
- Radon levels in St. Martin ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 3.8 pCi/L · 1 test
- Radon levels in Evangeline ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 2 tests
- Radon levels in Acadia ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.7 pCi/L · 1 test
- Radon levels in Pointe Coupee ParishEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Avoyelles ParishEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
St. Landry Parish, Cities and towns
Cities and towns in St. Landry Parish
About 80,765 people live in St. Landry Parish by the Census Bureau's estimate for July 1, 2025, 1,541 fewer than in 2020 (−1.9%). That works out to 87 people per square mile of land. No town dominates: Opelousas, the largest, has 15,098 residents, 18.7% of the total. Testing is reported here more often than across the state: CDC's 12 reported tests for 2015 come to 0.1 for every 1,000 residents (2025 estimate), against 0.1 for Louisiana.
From Opelousas to Palmetto, CDC publishes no figure by town: each reads St. Landry Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Opelousas | 15,098 | −4.2% | 18.7% |
| Euniceextends beyond St. Landry Parish | 9,035 | −3.7% | Counted whole |
| Sunset | 3,194 | +7.3% | 4.0% |
| Port Barre | 1,741 | −0.5% | 2.2% |
| Arnaudvilleextends beyond St. Landry Parish | 991 | −0.9% | Counted whole |
| Krotz Springs | 877 | −2.6% | 1.1% |
| Leonville | 870 | +0.1% | 1.1% |
| Grand Coteau | 759 | −1.7% | 0.9% |
| Melville | 735 | −2.9% | 0.9% |
| Washington | 704 | −5.0% | 0.9% |
| Cankton | 563 | −2.3% | 0.7% |
| Palmetto | 94 | Level | 0.1% |
12 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 St. Landry Parish is counted whole, so it has no share.
St. Landry Parish, Homes
Homes in St. Landry Parish
Of St. Landry Parish's 37,001 homes, 68% are detached houses, against 65% across Louisiana; 21% are mobile homes. Half of its homes were built before 1979, close to Louisiana's 1982: 15% date from before 1960 and 21% from 2000 or later. 70% 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 | St. Landry Parish | Louisiana |
|---|---|---|
| Housing units | 37,001 | 2,094,002 |
| Detached houses | 68% | 65% |
| In buildings of 5 or more | 4% | 11% |
| Mobile homes | 21% | 13% |
| Built before 1960 | 15% | 19% |
| Built since 2000 | 21% | 27% |
| Middle year built | 1979 | 1982 |
| Owner-occupied | 70% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.