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Radon Levels in Washington Parish, Louisiana

EPA puts Washington Parish in Zone 3, its lowest radon zone, and only 3 radon tests from it are on file with CDC (2014). Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

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  • Highest bordering

    0.0%

    Tangipahoa Parish

    Tangipahoa Parish
    0.0%

    1 of 6 neighbours have 30+ tests, 2006 to 2015

  • Nearest county

    0.0%

    Tangipahoa Parish, 27 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

    Washington Parish
    0.0%
    Louisiana
    0.0%

    Share of land USGS rates moderate or high potential

  • Tests reported

    3

    Too few for a share

    Washington Parish
    3
    Needed
    30

    2014

  • 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 Washington 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

Washington Parish, At a glance

Washington Parish at a glance

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

is EPA's lowest class, and its forecast for Washington 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 Washington Parish, 2014

CDC holds 3 reported tests for Washington Parish in 2014, with a median of 1.0 pCi/L: too few to describe a county (Radon411 reads a share from 30 tests up). Washington Parish beside the counties around it is how this page reads it.

What these figures count

Only 3 tests were reported to CDC for Washington Parish over 2014, 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: 2014. Measured data period: 2005 to 2017 (every CDC figure on file).

How to read these figures

Washington Parish, Compared

Washington Parish radon figures, compared

Calculated by Radon411

CDC's largest figure for Washington Parish rests on 3 tests in 2014, 0 of them at or above 4 pCi/L, so each test moves its share by 33.3 points and no rank or comparison is drawn from it. Results reached as high as 1.0 pCi/L, with a middle value of 1.0 pCi/L.

Tangipahoa Parish, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L. Farther out, East Baton Rouge Parish (66 miles away) at 0.0%, Jefferson Parish (74 miles away) at 1.5% and Calcasieu Parish (202 miles away) at 0.0% have figures too. 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 Washington 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 Washington 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
East Baton Rouge Parishlowest in the state480.0%0.6 pCi/L
St. Tammany Parish, LAborders it1910.5%0.2 pCi/L
Tangipahoa Parish, LAborders it430.0%0.1 pCi/L
The nearest Louisiana counties to Washington Parish with 30 or more tests, 2006 to 2015, laboratory
CountyDistanceTestsAt or above 4 pCi/LMedian
Tangipahoa Parish27 mi430.0%0.1 pCi/L
East Baton Rouge Parish66 mi480.0%0.6 pCi/L
Jefferson Parish74 mi671.5%0.2 pCi/L
Calcasieu Parish202 mi590.0%0.2 pCi/L
Washington Parish ten-year laboratory totals, against Louisiana's pooled share
PeriodTestsAt or above 4 pCi/LMedianHighestLouisiana, pooledChange from the row before
2008 to 201710.0%0.1 pCi/L0.1 pCi/L2.2%Level
2007 to 201610.0%0.1 pCi/L0.1 pCi/L2.6%Level
2006 to 201510.0%0.1 pCi/L0.1 pCi/L2.8%Level
2005 to 201410.0%0.1 pCi/L0.1 pCi/L2.6%First on file

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

Washington Parish, Geology

The ground under Washington Parish

Predicted

USGS's geologic map puts all of Washington Parish's mapped land in one class: low radon potential. The map puts 87.3% of Washington Parish in the area it calls Terraces and 12.4% in Delta. USGS gives the first a radon index of 8 and the second 6, both in the low band (5 to 8).

USGS's geologic areas under Washington Parish
AreaThe rock, in USGS's wordsPotentialRadon indexShare of land
TerracesClays, siltstone, and sandstone.Low887.3%
DeltaAlluvium and marsh.Low612.4%

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

Washington Parish beside the ground around it

Neither Washington Parish nor Louisiana as a whole has any land USGS rates above low potential. None of the 6 counties that border it has any moderate-potential ground either.

Share of land by USGS radon potential: Washington Parish, the 6 counties bordering it and Louisiana
AreaEPA zoneLow potentialModerate potentialHigh potential
Washington ParishZone 3100%NoneNone
Walthall County, MSZone 3100%NoneNone
Pearl River County, MSZone 3100%NoneNone
St. Tammany ParishZone 399.7%NoneNone
Tangipahoa ParishZone 3100%NoneNone
Marion County, MSZone 3100%NoneNone
Pike County, MSZone 3100%NoneNone
Louisiana64 parishes, pooled by land areaVaries98.4%NoneNone

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

Local help

Washington Parish, Local resources

Radon testing and mitigation in Washington Parish

What it means

Washington Parish, Questions

Questions about radon in Washington Parish

Are radon levels high in Washington Parish?

In 2014, 0.0% of the radon tests reported to CDC for Washington Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 1.0 pCi/L. Tangipahoa Parish, the one bordering county with a figure over the 2006 to 2015 laboratory totals, reported 0.0% of its tests at or above 4 pCi/L.

Which counties border Washington Parish?

Washington Parish borders 6 counties: Walthall County, MS, Pearl River County, MS, St. Tammany Parish, LA, Tangipahoa Parish, LA, Marion County, MS and Pike County, MS.

Products

Washington Parish, Products

Testing a home in Washington Parish

No CDC figure names Washington Parish; the nearest county with one, Tangipahoa Parish (27 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 Washington Parish.

Test kits and monitors3

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Best radon monitors for Washington Parish homes, compared

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Washington Parish, Bordering counties

Counties bordering Washington Parish

Calculated by Radon411

Washington Parish, Cities and towns

Cities and towns in Washington Parish

About 44,937 people live in Washington Parish by the Census Bureau's estimate for July 1, 2025, 421 fewer than in 2020 (−0.9%). That works out to 67 people per square mile of land. Its largest town, Bogalusa, has 10,321 residents, 23.0% of the total. Together its 4 incorporated places hold 32.2% of those residents; the other 67.8% live outside any of them. CDC's 3 reported tests for 2014 work out to 0.1 per 1,000 residents (2025 estimate), close to Louisiana's 0.1.

From Bogalusa to Angie, CDC publishes no figure by town: each reads Washington Parish's.

The cities and towns in Washington Parish by residents, July 1, 2025
PlaceResidentsSince 2020Share of residents
Bogalusa10,321−2.9%23.0%
Franklinton3,576−1.8%8.0%
Varnado317−1.6%0.7%
Angie246−0.4%0.5%

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).

Washington Parish, Homes

Homes in Washington Parish

Of Washington Parish's 21,422 homes, 68% are detached houses, against 65% across Louisiana; 24% are mobile homes. Half of its homes were built before 1980, close to Louisiana's 1982: 20% date from before 1960 and 24% from 2000 or later. 69% 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 Washington Parish, Louisiana, 2019 to 2023
HomesWashington ParishLouisiana
Housing units21,4222,094,002
Detached houses68%65%
In buildings of 5 or more2%11%
Mobile homes24%13%
Built before 196020%19%
Built since 200024%27%
Middle year built19801982
Owner-occupied69%67%

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