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. James Parish, Louisiana
EPA puts St. James Parish in Zone 3, its lowest radon zone, and only 6 radon tests from it are on file with CDC (2016). 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, 40 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. James Parish
- 0.0%
- Louisiana
- 0.0%
Share of land USGS rates moderate or high potential
Tests reported
6
Too few for a share
- St. James Parish
- 6
- Needed
- 30
2016
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. James 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. James Parish, At a glance
St. James 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. James Parish, 2016
CDC holds 6 reported tests for St. James Parish in 2016, with a median of 1.1 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). St. James Parish beside the counties around it is how this page reads it.
What these figures count
Only 6 tests were reported to CDC for St. James Parish over 2016, 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. Measured data period: 2016.
St. James Parish, Compared
St. James Parish radon figures, compared
Calculated by Radon411CDC's largest figure for St. James Parish rests on 6 tests in 2016, 0 of them at or above 4 pCi/L, so each test moves its share by 16.7 points and no rank or comparison is drawn from it. Results reached as high as 1.3 pCi/L, with a middle value of 1.1 pCi/L.
The nearest counties with a figure are East Baton Rouge Parish (40 miles away) at 0.0%, Jefferson Parish (43 miles away) at 1.5% and Tangipahoa Parish (47 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. James 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. James Parish, Geology
The ground under St. James Parish
PredictedUSGS's geologic map puts all of St. James Parish's mapped land in one class: low radon potential. All 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 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
St. James Parish beside the ground around it
Neither St. James Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 4 parishes that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
St. James Parish, Local resources
Radon testing and mitigation in St. James 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. James Parish, Questions
Questions about radon in St. James Parish
Are radon levels high in St. James Parish?
In 2016, 0.0% of the radon tests reported to CDC for St. James Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.1 pCi/L. Of the 4 nearest counties with a figure, within 154 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 1.5%.
Which counties border St. James Parish?
St. James Parish borders 4 parishes: Ascension Parish, Assumption Parish, St. John the Baptist Parish and Lafourche Parish.
Products
St. James Parish, Products
Testing a home in St. James Parish
No CDC figure names St. James Parish; the nearest county with one, East Baton Rouge Parish (40 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. James 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
MonitorX-Sense
XR0A-SR battery digital radon detector with a screen
- C-NRPP 2024/25: Not included
- Battery
- Screen
Method: Alpha spectrometry
First reading: Within 24 hours
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
St. James Parish, Bordering parishes
Parishes bordering St. James Parish
Calculated by Radon411- Radon levels in Ascension ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.5 pCi/L · 16 tests
- Radon levels in Lafourche ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 1 test
- Radon levels in Assumption ParishEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
St. James Parish, Cities and towns
Cities and towns in St. James Parish
St. James Parish has been losing residents: from 20,117 in 2020 to 18,938 on July 1, 2025, a fall of 5.9% by the Census Bureau's estimates. That works out to 80 people per square mile of land. No town dominates: Lutcher, the largest, has 2,822 residents, 14.9% of the total. Together its 2 incorporated places hold 29.1% of those residents; the other 70.9% live outside any of them. CDC's 6 reported tests for 2016 work out to 0.3 per 1,000 residents (2025 estimate), close to Louisiana's 0.3.
From Lutcher to Gramercy, CDC publishes no figure by town: each reads St. James Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Lutcher | 2,822 | −9.6% | 14.9% |
| Gramercy | 2,689 | −7.8% | 14.2% |
2 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).
St. James Parish, Homes
Homes in St. James Parish
Of St. James Parish's 8,651 homes, 75% are detached houses, against 65% across Louisiana; 18% are mobile homes. Half of its homes were built before 1985, close to Louisiana's 1982: 17% date from before 1960 and 32% from 2000 or later. Owners live in 85% of the occupied homes (Louisiana: 67%), so for most households a test and a fix are their own to order.
| Homes | St. James Parish | Louisiana |
|---|---|---|
| Housing units | 8,651 | 2,094,002 |
| Detached houses | 75% | 65% |
| In buildings of 5 or more | under 1% | 11% |
| Mobile homes | 18% | 13% |
| Built before 1960 | 17% | 19% |
| Built since 2000 | 32% | 27% |
| Middle year built | 1985 | 1982 |
| Owner-occupied | 85% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.