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 Jefferson Parish, Louisiana
EPA puts Jefferson Parish in Zone 3, its lowest radon zone, and only 6 radon tests from it are on file with CDC (2022). 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
- Jefferson Parish
- 0.0%
- Louisiana
- 0.5%
504 tests, 2018
Median result
0.4pCi/L
Below action level
- Jefferson Parish
- 0.4 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2018
Tests reported
504
Most tested in Louisiana
- 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
- Jefferson Parish
- 0.0%
- Lafayette Parish
- 8.0%
By share, of 12 with 30+ tests
Read a result for Jefferson Parish
Starts at Jefferson 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. Jefferson Parish's median reported result, 2018.
The data
Jefferson Parish, At a glance
Jefferson Parish at a glance
Predicted: EPA radon zone
EPA Zone 3: lower predicted potential
USGS geologic potential: Low across 85% of the county's area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
Radon tests reported for Jefferson Parish, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 16.7% |
| 2015 | 0.0% |
| 2016 | 0.0% |
| 2017 | 0.0% |
| 2018 | 0.0% |
| 2019 | 0.0% |
| 2020 | 0.0% |
| 2021 | 0.0% |
| 2022 | 0.0% |
2022: 0.0%. Across these years the share ran from 0.0% to 16.7%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 6 tests were reported to CDC for Jefferson Parish over 2022, 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: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).
Jefferson Parish, Compared
Jefferson Parish radon figures, compared
Calculated by Radon411Only 0 of 504 radon tests reported for Jefferson Parish in 2018 reached 4 pCi/L (0.0%). 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 2.0 pCi/L.
The newest figure, in 2022, counts only 6 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 504-test figure.
Across 28 Louisiana counties pooled together, 0.5% of tests reached that level, so Jefferson 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. Orleans Parish, the one bordering county with a figure for the same period, reported 0.0%.
Below the action level, 501 tests (99.4%) came in under 2 pCi/L, against 97.2% statewide, and 3 tests (0.6%) fell between 2 and 4, against 2.3% statewide. Over 6 years of annual figures the share held within 2 points, from 0.0% in 2015 to 0.0% in 2020; its peak was 0.0% in 2015. USGS geology rates 85% of the county's land low radon potential.
The busiest year on file was 2018, with 504 tests reported; the quietest, 2022, had 6.
Jefferson ParishLouisiana, pooled
| Year | Tests | Jefferson Parish, at or above 4 pCi/L | Louisiana, pooled |
|---|---|---|---|
| 2015 | 30 | 0.0% | 7.2% |
| 2016 | 78 | 0.0% | 2.0% |
| 2017 | 198 | 0.0% | 2.6% |
| 2018 | 504 | 0.0% | 0.5% |
| 2019 | 192 | 0.0% | 2.0% |
| 2020 | 339 | 0.0% | 0.8% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Jefferson Parish, Geology
The ground under Jefferson Parish
PredictedUSGS's geologic map puts all of Jefferson Parish's mapped land in one class: low radon potential. 84.8% of it lies in the area the map calls Delta, to which USGS gives a radon index of 6, in the low band (5 to 8).
| Area | The rock, in USGS's words | Potential | Radon index | Share of land |
|---|---|---|---|---|
| Delta | Alluvium and marsh. | Low | 6 | 84.8% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Jefferson Parish beside the ground around it
Neither Jefferson 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
Jefferson Parish, Local resources
Radon testing and mitigation in Jefferson 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
Jefferson Parish, Questions
Questions about radon in Jefferson Parish
Are radon levels high in Jefferson Parish?
In 2022, 0.0% of the radon tests reported to CDC for Jefferson Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.7 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 Jefferson Parish?
Jefferson Parish borders 6 parishes: Lafourche Parish, Orleans Parish, St. Charles Parish, Plaquemines Parish, St. John the Baptist Parish and St. Tammany Parish.
Products
Jefferson Parish, Products
Testing a home in Jefferson Parish
In Jefferson Parish, 0.0% of 504 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 Jefferson 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
Jefferson Parish, Bordering parishes
Parishes bordering Jefferson Parish
Calculated by Radon411- Radon levels in Lafourche ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 6 tests · 0.0 points above Jefferson Parish
- Radon levels in Orleans ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 351 tests · 0.0 points above Jefferson Parish
- Radon levels in St. Charles ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 6 tests · 0.0 points above Jefferson Parish
- Radon levels in St. Tammany ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 15 tests · 0.0 points above Jefferson Parish
- Radon levels in Plaquemines ParishEPA zone 3
No CDC figure for 2018; its page reads it against its own neighbours.
No CDC figure for 2018; its page reads it against its own neighbours.
Jefferson Parish, Cities and towns
Cities and towns in Jefferson Parish
About 431,398 people live in Jefferson Parish by the Census Bureau's estimate for July 1, 2025, 8,290 fewer than in 2020 (−1.9%). Packed into its land, that is 1,433 people per square mile. No town dominates: Kenner, the largest, has 65,136 residents, 15.1% of the total. Together its 6 incorporated places hold 23.8% of those residents; the other 76.2% live outside any of them. Testing is reported here more often than across the state: CDC's 504 reported tests for 2018 come to 1.2 for every 1,000 residents (2025 estimate), against 0.5 for Louisiana.
From Kenner to Grand Isle, CDC publishes no figure by town: each reads Jefferson Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Kenner | 65,136 | −1.7% | 15.1% |
| Gretna | 17,360 | −2.3% | 4.0% |
| Harahan | 8,916 | −2.0% | 2.1% |
| Westwego | 8,317 | −2.5% | 1.9% |
| Jean Lafitte | 1,858 | +2.8% | 0.4% |
| Grand Isle | 1,012 | +0.6% | 0.2% |
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).
Jefferson Parish, Homes
Homes in Jefferson Parish
Of Jefferson Parish's 194,109 homes, 65% are detached houses, against 65% across Louisiana; 19% are in buildings of five or more homes. Half of its homes were built before 1975, close to Louisiana's 1982: 18% date from before 1960 and 12% from 2000 or later. 62% 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 | Jefferson Parish | Louisiana |
|---|---|---|
| Housing units | 194,109 | 2,094,002 |
| Detached houses | 65% | 65% |
| In buildings of 5 or more | 19% | 11% |
| Mobile homes | 2% | 13% |
| Built before 1960 | 18% | 19% |
| Built since 2000 | 12% | 27% |
| Middle year built | 1975 | 1982 |
| Owner-occupied | 62% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.