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 St. Helena Parish, Louisiana
EPA puts St. Helena Parish in Zone 3, its lowest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
Highest bordering
0.0%
Tangipahoa Parish
- Tangipahoa Parish
- 0.0%
- East Baton Rouge Parish
- 0.0%
2 of 5 neighbours have 30+ tests, 2006 to 2015
Nearest county
0.0%
Tangipahoa Parish, 23 miles
- Tangipahoa Parish
- 0.0%
- Louisiana
- 2.8%
Share at 4+ pCi/L, 43 tests, 2006 to 2015
Ground above low
None
Level with Louisiana
- St. Helena Parish
- 0.0%
- Louisiana
- 0.0%
Share of land USGS rates moderate or high potential
Tests reported
0
None published
A home here needs its own test
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. Helena 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. Helena Parish, At a glance
St. Helena 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
No CDC test figures here
CDC has published no radon test figures for St. Helena Parish. The 2 counties bordering it with a figure over the 2006 to 2015 laboratory totals, Tangipahoa Parish and East Baton Rouge Parish, all reported 0.0% of their tests at or above 4 pCi/L.
St. Helena Parish, Compared
St. Helena Parish radon figures, compared
Calculated by Radon411No CDC figure names St. Helena Parish, in any year or ten-year total; over the 2006 to 2015 laboratory totals, the agency's counts reach 37 Louisiana counties without it. Pooled across 37 Louisiana counties, 2.8% of reported tests reached that level; across every county in the country with a figure, 36.3%.
The 2 counties bordering it with a figure over the 2006 to 2015 laboratory totals, Tangipahoa Parish and East Baton Rouge Parish, all reported 0.0% of their tests at or above 4 pCi/L. Farther out, Jefferson Parish (79 miles away) at 1.5% and Calcasieu Parish (163 miles away) at 0.0% have figures too. 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. Helena 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. Helena Parish, Geology
The ground under St. Helena Parish
PredictedUSGS's geologic map puts all of St. Helena Parish's mapped land in one class: low radon potential. All of it lies in the area the map calls Terraces, 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 | Clays, siltstone, and sandstone. | Low | 8 | 100% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
St. Helena Parish beside the ground around it
Neither St. Helena Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 5 counties that border it has any moderate-potential ground either.
The map rates the ground, not the air in any home.
Local help
St. Helena Parish, Local resources
Radon testing and mitigation in St. Helena 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. Helena Parish, Questions
Questions about radon in St. Helena Parish
Are radon levels high in St. Helena Parish?
No CDC testing statistics are published here for St. Helena Parish, Louisiana yet. The 2 counties bordering it with a figure over the 2006 to 2015 laboratory totals, Tangipahoa Parish and East Baton Rouge Parish, all reported 0.0% of their tests at or above 4 pCi/L.
Which counties border St. Helena Parish?
St. Helena Parish borders 5 counties: East Feliciana Parish, LA, Amite County, MS, Tangipahoa Parish, LA, Livingston Parish, LA and East Baton Rouge Parish, LA.
Products
St. Helena Parish, Products
Testing a home in St. Helena Parish
No CDC figure names St. Helena Parish; the nearest county with one, Tangipahoa Parish (23 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. Helena 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
EcoBlu plug-in digital radon monitor with a display
- C-NRPP 2024/25: Not included
- Plug-in
- Alarm
- Screen
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. Helena Parish, Bordering counties
Counties bordering St. Helena Parish
Calculated by Radon411- Radon levels in Livingston Parish, LAEPA zone 3
25.0%at or above 4 pCi/L
Median 1.3 pCi/L · 4 tests
- Radon levels in Tangipahoa Parish, LAEPA zone 3
0.0%at or above 4 pCi/L
Median 0.1 pCi/L · 43 tests
0.0%at or above 4 pCi/L
Median 0.6 pCi/L · 48 tests
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
- Radon levels in Amite County, MSEPA zone 3
No CDC figure for 2006 to 2015; its page reads it against its own neighbours.
St. Helena Parish, Cities and towns
Cities and towns in St. Helena Parish
About 10,758 people live in St. Helena Parish by the Census Bureau's estimate for July 1, 2025, 126 fewer than in 2020 (−1.2%). That works out to 26 people per square mile of land. No town dominates: Greensburg, the largest, has 615 residents, 5.7% of the total. Together its 2 incorporated places hold 7.6% of those residents; the other 92.4% live outside any of them. CDC publishes no radon test count for St. Helena Parish; across Louisiana its counts for 2006 to 2015 come to 0.1 tests for every 1,000 residents (2025 estimate).
From Greensburg to Montpelier, CDC publishes no figure by town: each reads St. Helena Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Greensburg | 615 | −2.7% | 5.7% |
| Montpelier | 198 | Level | 1.8% |
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. Helena Parish, Homes
Homes in St. Helena Parish
Mobile homes are 44% of St. Helena Parish's 5,310 homes and detached houses 52%, against 65% across Louisiana. Half of its homes were built before 1986, close to Louisiana's 1982: 8% date from before 1960 and 25% from 2000 or later. 74% 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. Helena Parish | Louisiana |
|---|---|---|
| Housing units | 5,310 | 2,094,002 |
| Detached houses | 52% | 65% |
| In buildings of 5 or more | 4% | 11% |
| Mobile homes | 44% | 13% |
| Built before 1960 | 8% | 19% |
| Built since 2000 | 25% | 27% |
| Middle year built | 1986 | 1982 |
| Owner-occupied | 74% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.