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Radon Levels in Iberia Parish, Louisiana

EPA puts Iberia Parish in Zone 3, its lowest radon zone, and only 2 radon tests from it are on file with CDC (2008 to 2017, laboratory totals). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

How to test this homeFind a certified tester

  • Nearest county

    0.0%

    East Baton Rouge Parish, 58 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

    Iberia Parish
    0.0%
    Louisiana
    0.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    4

    Too few for a share

    Iberia Parish
    4
    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 Iberia 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

Iberia Parish, At a glance

Iberia Parish at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Iberia 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 82% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Iberia Parish, 2008 to 2017, laboratory

CDC holds 2 reported tests for Iberia Parish over the 2008 to 2017 laboratory totals, with a median of 2.4 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Iberia Parish beside the counties around it is how this page reads it.

What these figures count

Only 2 tests were reported to CDC for Iberia Parish over 2008 to 2017 (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: 2008 to 2017, laboratory. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Iberia Parish, Compared

Iberia Parish radon figures, compared

Calculated by Radon411

CDC's largest figure for Iberia Parish rests on 4 tests over the 2006 to 2015 laboratory totals, 0 of them at or above 4 pCi/L, so each test moves its share by 25.0 points and no rank or comparison is drawn from it. Results reached as high as 2.6 pCi/L, with a middle value of 2.0 pCi/L.

The nearest counties with a figure are East Baton Rouge Parish (58 miles away) at 0.0%, Tangipahoa Parish (94 miles away) at 0.0% and Jefferson Parish (97 miles away) at 1.5%. 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 Iberia Parish in Zone 3, its lowest label: a predicted county average under 2 pCi/L. USGS geology rates 82% of the county's land low radon potential.

Louisiana, the United States and the counties around Iberia 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
Lafayette Parish, LAborders it214.8%0.7 pCi/L
Iberville Parish, LAborders it10.0%0.6 pCi/L
St. Martin Parish, LAborders it10.0%3.8 pCi/L
The nearest Louisiana counties to Iberia Parish with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
East Baton Rouge Parish58 mi480.0%0.6 pCi/L
Tangipahoa Parish94 mi430.0%0.1 pCi/L
Jefferson Parish97 mi671.5%0.2 pCi/L
Calcasieu Parish100 mi590.0%0.2 pCi/L
Iberia Parish ten-year laboratory totals, against Louisiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestLouisiana, pooledChange from the row before
2008 to 201720.0%2.4 pCi/L2.6 pCi/L2.2%Level
2007 to 201620.0%2.4 pCi/L2.6 pCi/L2.6%Level
2006 to 201540.0%2.0 pCi/L2.6 pCi/L2.8%Level
2005 to 201440.0%2.0 pCi/L2.6 pCi/L2.6%First on file

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

Iberia Parish, Geology

The ground under Iberia Parish

Predicted

USGS's geologic map puts all of Iberia Parish's mapped land in one class: low radon potential. The map puts 38.7% of Iberia Parish in the area it calls Delta and 26.6% in Terraces and Prairies, with one smaller area beside them. USGS gives the first a radon index of 6 and the second 8, both in the low band (5 to 8).

USGS's geologic areas under Iberia Parish
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
DeltaAlluvium and marsh.Low638.7%
Terraces and PrairiesClay, sandy clay, silt, sand, and some gravel.Low826.6%
FloodplainAlluvium, marsh, silt, and clay.Low716.9%

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

Iberia Parish beside the ground around it

Neither Iberia 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.

Share of land by USGS radon potential: Iberia Parish, the 6 parishes bordering it and Louisiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Iberia ParishZone 382.2%NoneNone
St. Martin ParishZone 3100%NoneNone
Lafayette ParishZone 3100%NoneNone
Vermilion ParishZone 399.8%NoneNone
St. Mary ParishZone 392.6%NoneNone
Iberville ParishZone 3100%NoneNone
Assumption ParishZone 3100%NoneNone
Louisiana64 parishes, pooled by land areaVaries98.4%NoneNone

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

Local help

Iberia Parish, Local resources

Radon testing and mitigation in Iberia Parish

What it means

Iberia Parish, Questions

Questions about radon in Iberia Parish

Are radon levels high in Iberia Parish?

Over the 2008 to 2017 laboratory totals, 0.0% of the radon tests reported to CDC for Iberia Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 2.4 pCi/L. Of the 4 nearest counties with a figure, within 100 miles, the share of tests at or above 4 pCi/L runs from 0.0% to 1.5%.

Which counties border Iberia Parish?

Iberia Parish borders 6 parishes: St. Martin Parish, Lafayette Parish, Vermilion Parish, St. Mary Parish, Iberville Parish and Assumption Parish.

Products

Iberia Parish, Products

Testing a home in Iberia Parish

No CDC figure names Iberia Parish; the nearest county with one, East Baton Rouge Parish (58 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 Iberia Parish.

Test kits and monitors3

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Best radon monitors for Iberia Parish homes, compared

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Iberia Parish, Bordering parishes

Parishes bordering Iberia Parish

Calculated by Radon411

Iberia Parish, Cities and towns

Cities and towns in Iberia Parish

About 66,846 people live in Iberia Parish by the Census Bureau's estimate for July 1, 2025, 3,208 fewer than in 2020 (−4.6%). That works out to 117 people per square mile of land. Its largest town, New Iberia, has 26,533 residents, 39.7% of the total. Reported testing is thin here: 4 tests over 2006 to 2015, or 0.1 for every 1,000 residents (2025 estimate), where Louisiana as a whole comes to 0.1.

From New Iberia to Loreauville, CDC publishes no figure by town: each reads Iberia Parish's.

The cities and towns in Iberia Parish by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
New Iberia26,533−6.6%39.7%
Jeanerette4,484−6.4%6.7%
Delcambreextends beyond Iberia Parish1,766−2.2%Counted whole
Loreauville642−2.4%1.0%

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). A place that extends beyond Iberia Parish is counted whole, so it has no share.

Iberia Parish, Homes

Homes in Iberia Parish

Of Iberia Parish's 31,215 homes, 67% are detached houses, against 65% across Louisiana; 20% are mobile homes. Half of its homes were built before 1981, close to Louisiana's 1982: 21% date from before 1960 and 24% from 2000 or later. 68% 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 Iberia Parish, Louisiana, 2019 to 2023
HomesIberia ParishLouisiana
Housing units31,2152,094,002
Detached houses67%65%
In buildings of 5 or more7%11%
Mobile homes20%13%
Built before 196021%19%
Built since 200024%27%
Middle year built19811982
Owner-occupied68%67%

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