Short-term kitFirst Alert
RD1 short-term charcoal radon test kit
- Lab fee included
Method: Charcoal
In home: 2 to 4 days
Locations and reports
Radon Levels in Iberville Parish, Louisiana
EPA puts Iberville Parish in Zone 3, its lowest radon zone, and most reported tests there come back low, though 0.0% of 60 (2019) 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%
2.0 pts below LA
- Iberville Parish
- 0.0%
- Louisiana
- 2.0%
60 tests, 2019
Median result
0.2pCi/L
Below action level
- Iberville Parish
- 0.2 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2019
Tests reported
60
9th of 13 by tests
- Iberville Parish
- 60
- Lafayette Parish
- 651
Reported to CDC before any fix, 2019
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
5 of 13
Middle half
- Iberville Parish
- 0.0%
- Rapides Parish
- 7.1%
By share, of 13 with 30+ tests
Read a result for Iberville Parish
Starts at Iberville 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. Iberville Parish's median reported result, 2019.
The data
Iberville Parish, At a glance
Iberville 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 Iberville Parish, 2019
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 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
These are the 60 tests reported to CDC for Iberville Parish over 2019, 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: 2019. Measured data period: 2005 to 2019 (every CDC figure on file).
Iberville Parish, Compared
Iberville Parish radon figures, compared
Calculated by Radon411Only 0 of 60 radon tests reported for Iberville Parish in 2019 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.
Across 23 Louisiana counties pooled together, 2.0% of tests reached that level, so Iberville Parish runs 2.0 points below its state. Against the national pool of 29.0%, the gap is 29.0 points lower. Its place in the state: 5th of 13 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. East Baton Rouge Parish, the one bordering county with a figure for the same period, reported 0.0%.
Below the action level, 60 tests (100.0%) came in under 2 pCi/L, against 95.6% statewide, and 0 tests (0.0%) fell between 2 and 4, against 2.4% statewide. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2019, with 60 tests reported; the quietest, 2018, had 9.
Pooled shares: Radon411's sum of CDC's county counts for one period.
Iberville Parish, Geology
The ground under Iberville Parish
PredictedUSGS's geologic map puts all of Iberville Parish's mapped land in one class: low radon potential. 96.4% of it lies in the area the map calls Floodplain, 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 |
|---|---|---|---|---|
| Floodplain | Alluvium, marsh, silt, and clay. | Low | 7 | 96.4% |
| Delta | Alluvium and marsh. | Low | 6 | 3.6% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Iberville Parish beside the ground around it
Neither Iberville Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 7 parishes that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
Iberville Parish, Local resources
Radon testing and mitigation in Iberville 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
Iberville Parish, Questions
Questions about radon in Iberville Parish
Are radon levels high in Iberville Parish?
In 2019, 0.0% of the radon tests reported to CDC for Iberville Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. Of 13 Louisiana counties with 30 or more tests for the same period, 4 reported a higher share; pooled, the state comes to 2.0%.
Which counties border Iberville Parish?
Iberville Parish borders 7 parishes: West Baton Rouge Parish, East Baton Rouge Parish, Ascension Parish, St. Martin Parish, Assumption Parish, Pointe Coupee Parish and Iberia Parish.
Products
Iberville Parish, Products
Testing a home in Iberville Parish
In Iberville Parish, 0.0% of 60 tests reported to CDC in 2019 reached 4 pCi/L, against 2.0% 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 Iberville 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
View Plus radon and air quality monitor
- C-NRPP 2024/25: Approved
- Battery
- Wi-Fi, Bluetooth
- Screen, app
Method: Alpha spectrometry
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
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Iberville Parish, Bordering parishes
Parishes bordering Iberville Parish
Calculated by Radon411- Radon levels in East Baton Rouge ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 99 tests · 0.0 points above Iberville Parish
- Radon levels in West Baton Rouge ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Ascension ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in St. Martin ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Assumption ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Pointe Coupee ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
- Radon levels in Iberia ParishEPA zone 3
No CDC figure for 2019; its page reads it against its own neighbours.
Iberville Parish, Cities and towns
Cities and towns in Iberville Parish
About 29,579 people live in Iberville Parish by the Census Bureau's estimate for July 1, 2025, 491 fewer than in 2020 (−1.6%). That works out to 48 people per square mile of land. Its largest town, St. Gabriel, has 6,987 residents, 23.6% of the total. Together its 6 incorporated places hold 55.6% of those residents; the other 44.4% live outside any of them. Testing is reported here more often than across the state: CDC's 60 reported tests for 2019 come to 2.0 for every 1,000 residents (2025 estimate), against 0.5 for Louisiana.
From St. Gabriel to Grosse Tete, CDC publishes no figure by town: each reads Iberville Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| St. Gabriel | 6,987 | +8.5% | 23.6% |
| Plaquemine | 5,891 | −5.4% | 19.9% |
| White Castle | 1,585 | −7.6% | 5.4% |
| Maringouin | 810 | −7.7% | 2.7% |
| Rosedale | 635 | −2.8% | 2.1% |
| Grosse Tete | 527 | −4.0% | 1.8% |
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).
Iberville Parish, Homes
Homes in Iberville Parish
Of Iberville Parish's 13,419 homes, 73% are detached houses, against 65% across Louisiana; 19% are mobile homes. Half of its homes were built before 1984, close to Louisiana's 1982: 16% date from before 1960 and 27% from 2000 or later. Owners live in 76% of the occupied homes (Louisiana: 67%), so for most households a test and a fix are their own to order.
| Homes | Iberville Parish | Louisiana |
|---|---|---|
| Housing units | 13,419 | 2,094,002 |
| Detached houses | 73% | 65% |
| In buildings of 5 or more | 3% | 11% |
| Mobile homes | 19% | 13% |
| Built before 1960 | 16% | 19% |
| Built since 2000 | 27% | 27% |
| Middle year built | 1984 | 1982 |
| Owner-occupied | 76% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.