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Radon Levels in Concordia Parish, Louisiana

EPA puts Concordia Parish in Zone 3, its lowest radon zone, and only 1 radon test from it is on file with CDC (2006 to 2015, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Nearest county

    0.0%

    East Baton Rouge Parish, 70 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

    Concordia Parish
    0.0%
    Louisiana
    0.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    1

    Too few for a share

    Concordia Parish
    1
    Needed
    30

    2006 to 2015, laboratory

  • EPA radon zone

    Zone 3

    Lower potential

    1. 1
    2. 2
    3. Zone 3

    1 highest, 3 lowest

    EPA predicts under 2 pCi/L indoors

Read a result for Concordia Parish

Starts at EPA's action level

4.0pCi/L

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

  1. Under 20 to 1.9 pCi/L
  2. 2 to 4consider a fix
  3. 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.

Interpret this readingWhat a fix costs

The data

Concordia Parish, At a glance

Concordia Parish at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Concordia Parish as a whole is an average indoor of less than 2 pCi/L (less than 75 Bq/m³). A low zone clears no address in it: homes above EPA's turn up in all three zones.

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 Concordia Parish, 2006 to 2015, laboratory

CDC holds 1 reported test for Concordia Parish over the 2006 to 2015 laboratory totals, a result of 2.6 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Concordia Parish beside the counties around it is how this page reads it.

What these figures count

Only 1 test was reported to CDC for Concordia Parish over 2006 to 2015 (laboratory totals), 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: 2006 to 2015, laboratory. Measured data period: 2005 to 2015 (every CDC figure on file).

How to read these figures

Concordia Parish, Compared

Concordia Parish radon figures, compared

Calculated by Radon411

CDC's largest figure for Concordia Parish rests on 1 test over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 100.0 points and no rank or comparison is drawn from it. Results reached as high as 2.6 pCi/L, with a middle value of 2.6 pCi/L.

The nearest counties with a figure are East Baton Rouge Parish (70 miles away) at 0.0%, Tangipahoa Parish (92 miles away) at 0.0% and Calcasieu Parish (132 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 Concordia 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.

Louisiana, the United States and the counties around Concordia Parish, 2006 to 2015, laboratory
AreaTestsAt or above 4 pCi/LMedian
Louisiana, pooled37 counties, pooled4342.8%Not pooled
United States, pooled2,669 counties, pooled1,805,52836.3%Not pooled
Jefferson Parishhighest in the state671.5%0.2 pCi/L
Tangipahoa Parishlowest in the state430.0%0.1 pCi/L
The nearest Louisiana counties to Concordia Parish with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
East Baton Rouge Parish70 mi480.0%0.6 pCi/L
Tangipahoa Parish92 mi430.0%0.1 pCi/L
Calcasieu Parish132 mi590.0%0.2 pCi/L
Jefferson Parish146 mi671.5%0.2 pCi/L
Concordia Parish ten-year laboratory totals, against Louisiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestLouisiana, pooledChange from the row before
2006 to 201510.0%2.6 pCi/L2.6 pCi/L2.8%Level
2005 to 201410.0%2.6 pCi/L2.6 pCi/L2.6%First on file

Pooled shares: Radon411's sum of CDC's county counts for one period.

Concordia Parish, Geology

The ground under Concordia Parish

Predicted

USGS's geologic map puts all of Concordia Parish's mapped land in one class: low radon potential. 98.3% 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).

USGS's geologic areas under Concordia Parish
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
FloodplainAlluvium, marsh, silt, and clay.Low798.3%
Mississippi Alluvial PlainAlluvial sand, silt, gravel, and clay.Low81.7%

Names, descriptions and indexes: U.S. Geological Survey, Geologic Radon Potential Map (2025). Shares: Radon411, from the map cut to the boundary.

Concordia Parish beside the ground around it

Neither Concordia Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 7 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Concordia Parish, the 7 counties bordering it and Louisiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Concordia ParishZone 3100%NoneNone
Catahoula ParishZone 3100%NoneNone
Adams County, MSZone 3100%NoneNone
Avoyelles ParishZone 3100%NoneNone
Wilkinson County, MSZone 3100%NoneNone
West Feliciana ParishZone 3100%NoneNone
Pointe Coupee ParishZone 3100%NoneNone
Tensas ParishZone 3100%NoneNone
Louisiana64 parishes, pooled by land areaVaries98.4%NoneNone

The map rates the ground, not the air in any home.

Local help

Concordia Parish, Local resources

Radon testing and mitigation in Concordia Parish

What it means

Concordia Parish, Questions

Questions about radon in Concordia Parish

Are radon levels high in Concordia Parish?

Over the 2006 to 2015 laboratory totals, 0.0% of the radon tests reported to CDC for Concordia Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.6 pCi/L. Of the 4 nearest counties with a figure, within 146 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 1.5%.

Which counties border Concordia Parish?

Concordia Parish borders 7 counties: Catahoula Parish, LA, Adams County, MS, Avoyelles Parish, LA, Wilkinson County, MS, West Feliciana Parish, LA, Pointe Coupee Parish, LA and Tensas Parish, LA.

Products

Concordia Parish, Products

Testing a home in Concordia Parish

No CDC figure names Concordia Parish; the nearest county with one, East Baton Rouge Parish (70 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 Concordia Parish.

Test kits and monitors3

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Best radon monitors for Concordia Parish homes, compared

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Concordia Parish, Bordering counties

Counties bordering Concordia Parish

Calculated by Radon411

Concordia Parish, Cities and towns

Cities and towns in Concordia Parish

About 17,836 people live in Concordia Parish by the Census Bureau's estimate for July 1, 2025, 738 fewer than in 2020 (−4.0%). That works out to 26 people per square mile of land. Its largest town, Vidalia, has 3,925 residents, 22.0% of the total. Together its 4 incorporated places hold 44.8% of those residents; the other 55.2% live outside any of them. Reported testing is thin here: 1 test over 2006 to 2015, or 0.1 for every 1,000 residents (2025 estimate), where Louisiana as a whole comes to 0.1.

From Vidalia to Ridgecrest, CDC publishes no figure by town: each reads Concordia Parish's.

The cities and towns in Concordia Parish by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Vidalia3,925−1.5%22.0%
Ferriday2,984−6.4%16.7%
Clayton549−5.5%3.1%
Ridgecrest539−6.6%3.0%

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).

Concordia Parish, Homes

Homes in Concordia Parish

Of Concordia Parish's 9,026 homes, 70% are detached houses, against 65% across Louisiana; 23% are mobile homes. Half of its homes were built before 1976, close to Louisiana's 1982: 21% date from before 1960 and 18% from 2000 or later. 70% 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 in Concordia Parish, Louisiana, 2019 to 2023
HomesConcordia ParishLouisiana
Housing units9,0262,094,002
Detached houses70%65%
In buildings of 5 or more3%11%
Mobile homes23%13%
Built before 196021%19%
Built since 200018%27%
Middle year built19761982
Owner-occupied70%67%

Census Bureau, American Community Survey, 2019 to 2023: estimates from a sample of homes, looser for a small place. Shares by Radon411.