Short-term kit
RA100 short-term liquid scintillation radon test kit
- Lab fee extra
Method: Liquid scintillation
In home: 48 to 96 hours
Locations and reports
Radon Levels in Ouachita Parish, Louisiana
EPA puts Ouachita Parish in Zone 3, its lowest radon zone, and only 3 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%
3.9 pts below LA
- Ouachita Parish
- 0.0%
- Louisiana
- 3.9%
159 tests, 2021
Median result
0.7pCi/L
Below action level
- Ouachita Parish
- 0.7 pCi/L
- EPA
- 4.0 pCi/L
Midpoint of the tests, 2021
Tests reported
159
10th of 14 by tests
- Ouachita Parish
- 159
- Ascension Parish
- 522
Reported to CDC before any fix, 2021
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
3 of 14
Top quarter
- Ouachita Parish
- 0.0%
- Caddo Parish
- 20.1%
By share, of 14 with 30+ tests
Read a result for Ouachita Parish
Starts at Ouachita Parish's median, 0.7 pCi/L
EPA’s own thresholds; the figures are the area’s, never this home’s.
EPA’s reading of 0.7 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. Ouachita Parish's median reported result, 2021.
The data
Ouachita Parish, At a glance
Ouachita 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 Ouachita Parish, 2022
| Year | Share of reported tests at or above 4 pCi/L |
|---|---|
| 2014 | 0.0% |
| 2015 | 33.3% |
| 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 33.3%. Each column counts radon tests reported to CDC that year, not homes.
What these figures count
Only 3 tests were reported to CDC for Ouachita 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).
Ouachita Parish, Compared
Ouachita Parish radon figures, compared
Calculated by Radon411Only 0 of 159 radon tests reported for Ouachita Parish in 2021 reached 4 pCi/L (0.0%). The median result, 0.7 pCi/L, sits below 2, well under EPA's 4 pCi/L action level, and the top reported result was 2.4 pCi/L.
The newest figure, in 2022, counts only 3 tests (0.0% at or above 4 pCi/L), too few to compare, so this reading uses the 159-test figure.
Across 21 Louisiana counties pooled together, 3.9% of tests reached that level, so Ouachita Parish runs 3.9 points below its state. Against the national pool of 24.4%, the gap is 24.4 points lower. Its place in the state: 3rd of 14 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.
Below the action level, 153 tests (96.2%) came in under 2 pCi/L, against 92.3% statewide, and 6 tests (3.8%) fell between 2 and 4, against 3.8% statewide. Over 6 years of annual figures the share held within 2 points, from 0.0% in 2016 to 0.0% in 2021; its peak was 0.0% in 2016. USGS geology rates 100% of the county's land low radon potential.
The busiest year on file was 2021, with 159 tests reported; the quietest, 2022, had 3.
Ouachita ParishLouisiana, pooled
| Year | Tests | Ouachita Parish, at or above 4 pCi/L | Louisiana, pooled |
|---|---|---|---|
| 2016 | 42 | 0.0% | 2.0% |
| 2017 | 57 | 0.0% | 2.6% |
| 2018 | 96 | 0.0% | 0.5% |
| 2019 | 93 | 0.0% | 2.0% |
| 2020 | 30 | 0.0% | 0.8% |
| 2021 | 159 | 0.0% | 3.9% |
Pooled shares: Radon411's sum of CDC's county counts for one period.
Ouachita Parish, Geology
The ground under Ouachita Parish
PredictedUSGS's geologic map puts all of Ouachita Parish's mapped land in one class: low radon potential. The map puts 52.9% of Ouachita Parish in the area it calls Old Uplands and 47.1% in Floodplain. USGS gives both 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 |
|---|---|---|---|---|
| Old Uplands | Clays, silts, sands, and ironstone. | Low | 7 | 52.9% |
| Floodplain | Alluvium, marsh, silt, and clay. | Low | 7 | 47.1% |
Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.
Ouachita Parish beside the ground around it
Neither Ouachita 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
Ouachita Parish, Local resources
Radon testing and mitigation in Ouachita 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
Ouachita Parish, Questions
Questions about radon in Ouachita Parish
Are radon levels high in Ouachita Parish?
In 2022, 0.0% of the radon tests reported to CDC for Ouachita Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Of 14 Louisiana counties with 30 or more tests for the same period, 2 reported a higher share; pooled, the state comes to 3.9%.
Which counties border Ouachita Parish?
Ouachita Parish borders 6 parishes: Jackson Parish, Caldwell Parish, Union Parish, Richland Parish, Morehouse Parish and Lincoln Parish.
Products
Ouachita Parish, Products
Testing a home in Ouachita Parish
In Ouachita Parish, 0.0% of 159 tests reported to CDC in 2021 reached 4 pCi/L, against 3.9% 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 Ouachita 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
MonitorAEGTEST
HOUND-3699 radon monitor with a 2.1-inch touchscreen
- C-NRPP 2024/25: Not included
- Battery
- Alarm
- Screen
First reading: Within 1 hour
- See every kit and monitor Test kits and monitors
Test kits and monitors: 1 of 3
Explore
Ouachita Parish, Bordering parishes
Parishes bordering Ouachita Parish
Calculated by Radon411- Radon levels in Caldwell ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 1.0 pCi/L · 3 tests · 0.0 points above Ouachita Parish
- Radon levels in Lincoln ParishEPA zone 3
0.0%at or above 4 pCi/L
Median 0.8 pCi/L · 3 tests · 0.0 points above Ouachita Parish
- Radon levels in Jackson ParishEPA zone 3
No CDC figure for 2021; its page reads it against its own neighbours.
- Radon levels in Union ParishEPA zone 3
No CDC figure for 2021; its page reads it against its own neighbours.
- Radon levels in Richland ParishEPA zone 3
No CDC figure for 2021; its page reads it against its own neighbours.
- Radon levels in Morehouse ParishEPA zone 3
No CDC figure for 2021; its page reads it against its own neighbours.
Ouachita Parish, Cities and towns
Cities and towns in Ouachita Parish
About 158,542 people live in Ouachita Parish by the Census Bureau's estimate for July 1, 2025, 1,564 fewer than in 2020 (−1.0%). That works out to 260 people per square mile of land. Its largest town, Monroe, has 46,860 residents, 29.6% of the total. Together its 4 incorporated places hold 41.5% of those residents; the other 58.5% live outside any of them. CDC's 159 reported tests for 2021 work out to 1.0 per 1,000 residents (2025 estimate), close to Louisiana's 0.7.
From Monroe to Sterlington, CDC publishes no figure by town: each reads Ouachita Parish's.
| Place | Residents | Since 2020 | Share of residents |
|---|---|---|---|
| Monroe | 46,860 | −1.8% | 29.6% |
| West Monroe | 12,478 | −4.4% | 7.9% |
| Richwood | 3,834 | −1.3% | 2.4% |
| Sterlington | 2,663 | +31.9% | 1.7% |
4 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).
Ouachita Parish, Homes
Homes in Ouachita Parish
Of Ouachita Parish's 70,667 homes, 66% are detached houses, against 65% across Louisiana; 14% are mobile homes. Half of its homes were built before 1983, close to Louisiana's 1982: 16% date from before 1960 and 25% from 2000 or later. 59% 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 | Ouachita Parish | Louisiana |
|---|---|---|
| Housing units | 70,667 | 2,094,002 |
| Detached houses | 66% | 65% |
| In buildings of 5 or more | 9% | 11% |
| Mobile homes | 14% | 13% |
| Built before 1960 | 16% | 19% |
| Built since 2000 | 25% | 27% |
| Middle year built | 1983 | 1982 |
| Owner-occupied | 59% | 67% |
Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.