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Radon Levels in Lafayette Parish, Louisiana

Zone 3Lower predicted potential268 square miles · 5 bordering counties

What this means for you

  • Your area: EPA rates Lafayette Parish Zone 3, the lowest of its three radon zones. That is a prediction for the whole county, and homes with elevated levels occur in all three zones.
  • Local tests: Of 201 radon tests reported to CDC for Lafayette Parish (2022), 0.0% were at or above 4 pCi/L, EPA's action level.
  • Your home: The only way to know your home’s level is to test it.

pCi/L (picocuries per liter) is the unit radon is measured in. EPA recommends fixing a home at 4 pCi/L or above, its action level.

In 2022, 0.0% of the radon tests reported to CDC for Lafayette Parish, Louisiana came back at or above the EPA action level of 4 pCi/L, and the median result was 0.2 pCi/L. EPA's Map of Radon Zones places the county in Zone 3, lower predicted potential. Radon levels vary from home to home, so only a test measures the level in yours.

Predicted: EPA radon zone

EPA Zone 3: lower predicted potential

EPA predicts an average indoor of less than 2 pCi/L (less than 75 Bq/m³) across the county as a whole.

This is a county-level geologic prediction. It is not a measurement of any address, and houses with elevated radon are found in all three zones.

USGS geologic potential: High across 100% of the county's land area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

Radon tests reported for Lafayette Parish, 2022

Tests reported
201
At or above 4 pCi/L
0.0%
Median result
0.2 pCi/L
Reported results by concentration band, Lafayette Parish, 2022
Under 2 pCi/L: 99%2 to 4 pCi/L: 2%4 pCi/L and above: 0%

Of 201 pre-mitigation tests reported to CDC, not homes in this area. CDC publishes the share in each band, not a count per band, so the per-band counts in the table are calculated by Radon411 and rounded to add up to the published total.

Reported results by concentration band, Lafayette Parish, 2022: data table
Result bandTests Calculated by Radon411Share Measured
Under 2 pCi/L19898.5%
2 to 4 pCi/L31.5%
4 pCi/L and above00.0%

Distribution of tested buildings, not this house. People testing before a sale, or because they suspect a problem, are over-represented in any reported testing data.

Measured: CDC tracking data. Figure above: 2022. Measured data period: 2005 to 2022 (every CDC figure on file).

Lafayette Parish, In figures

Lafayette Parish in figures

What the published data says about Lafayette Parish, in words. A zone and a share of tests describe an area, never the level in any one home.

    • Predicted

      Predicted

      EPA places Lafayette Parish in Zone 3, lower predicted potential, as it does 63 other counties of Louisiana's 64.

      Of the 5 bordering counties, EPA places Acadia Parish, Iberia Parish, St. Landry Parish, St. Martin Parish and Vermilion Parish in Zone 3.

  • Reported tests

    Measured

    CDC has annual figures for Lafayette Parish for 9 years, 2014 to 2022. In 2022, 0.0% of 201 reported tests were at or above 4 pCi/L.

    Across those years the share ranged from 0.0% (2022) to 30.0% (2014). Few tests in a year can move it a long way.

  • Local record

    Louisiana's radon program and its page are under Local resources.

    The county's largest incorporated places are Lafayette, Youngsville and Broussard; the figures here cover them as part of the county.

Lafayette Parish, Reported testing

Reported testing over time

Measured
Reported radon test results by year, Lafayette Parish, pCi/LLogarithmic scale: each step up the axis multiplies the level, so the median and the single highest result can share one chart. The darker gridline is EPA's action level, 4 pCi/L.
Median reported resultHighest reported result
Reported radon test results by year, Lafayette Parish, pCi/L: data table
YearMedian reported resultHighest reported resultShare of tests at or above 4 pCi/L
20142.8 pCi/L20.0 pCi/L30.0%
20152.5 pCi/L10.8 pCi/L22.2%
20160.7 pCi/L7.2 pCi/L6.2%
20172.0 pCi/L7.2 pCi/L26.7%
20181.2 pCi/L26.0 pCi/L8.0%
20190.7 pCi/L10.9 pCi/L2.3%
20202.2 pCi/L13.5 pCi/L19.0%
20210.7 pCi/L9.8 pCi/L14.3%
20220.2 pCi/L2.6 pCi/L0.0%

What these figures count

Every percentage here is a share of radon tests reported to CDC for Lafayette Parish in 2022. It is not a share of homes in Lafayette Parish, and it is not a random sample: it counts only the tests people chose to run and that were reported.

The shares and the median are calculated from pre-mitigation tests (201 for 2022). CDC also reports the number of buildings tested (4), a different count, so the two totals are not interchangeable.

Lafayette Parish, Bordering counties

Counties bordering Lafayette Parish

Calculated by Radon411

5 counties share a boundary with Lafayette Parish, computed from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county’s report can be worth reading alongside this one.

Lafayette Parish, Local resources

Local resources in Louisiana

Who to ask in Louisiana: the state's radon program, test kits and professionals.

Louisiana's radon program

Louisiana Department of Environmental Quality

Louisiana’s radon program answers questions about testing, mitigation and the rules where you live.

Visit the program's page(opens in a new tab)

Test kits

Ask the program whether it has free or discounted kits, or compare kits you can buy.

Radon professionals

1 professional is listed in Louisiana.

Professionals in Louisiana

Lafayette Parish, Cities and towns

Cities and towns in Lafayette Parish

The radon figures on this page are for Lafayette Parish as a whole. They do not differ by city or town.

  • Lafayette
  • Youngsville
  • Broussard (part)
  • Carencro
  • Scott
  • Duson (part)

6 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county.

Lafayette Parish, Questions

Questions about radon in Lafayette Parish

Common questions8 questions, answered from the figures above

Are radon levels high in Lafayette Parish?

In 2022, 0.0% of the radon tests reported to CDC for Lafayette Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.2 pCi/L. That is a share of reported tests, not of homes. EPA places Lafayette Parish in Zone 3, lower predicted potential, a predicted average indoor screening level less than 2 pCi/L. Homes with elevated levels occur in all three zones, so the figures describe the area, not your house. Testing is the only way to know the radon level in a specific building.

What a radon level meansRadon in Louisiana

How do I get a radon test in Lafayette Parish?

EPA says you can test your home yourself or hire a qualified radon test company, and that either approach takes only a small amount of time and effort. No certified tester listed on Radon411 names Lafayette Parish as a service area yet. The Louisiana radon program is the place to ask about certified testers and any test kit offer it runs.

How to test a homeTest kits comparedFree and low-cost kits by stateLouisiana radon program

Who does radon mitigation in Lafayette Parish?

No listed mitigator names Lafayette Parish as a service area yet; the Louisiana directory lists 1 company. EPA recommends having a qualified contractor fix a home with a radon problem, because lowering high radon levels takes technical knowledge and special skills, and some states require the work to be done by a licensed or certified professional. Your state radon program is the place to check whether Louisiana requires one.

How radon mitigation worksWhat mitigation costsMitigators in Louisiana

What EPA radon zone is Lafayette Parish in?

EPA places Lafayette Parish, Louisiana in Zone 3, which EPA describes as lower predicted potential for the area. A zone is a prediction for the whole county and never determines whether a particular home should be tested. EPA recommends testing every home regardless of zone.

Should I test my home in Lafayette Parish?

Yes. Testing is the only way to know the radon level in a specific building. EPA recommends fixing a home when the radon level is 4 pCi/L or higher. EPA recommends considering a fix when the level is between 2 and 4 pCi/L. How to test a home.

When is the best time of year to test?

EPA says short-term tests stay in the home from 2 to 90 days and that all radon tests should run a minimum of 48 hours; long-term tests stay more than 90 days. EPA's guides do not name a best season: they say radon levels tend to vary from day to day and season to season, so a long-term test is more likely than a short-term test to tell you the year-round average.

What does it cost to test?

EPA's Citizen's Guide calls testing easy and inexpensive, and EPA's Home Buyer's and Seller's Guide says passive short-term and long-term devices are generally inexpensive, while active devices may cost more. No national average price is published for this, so Radon411 does not give one. What testing costs.

Which counties border Lafayette Parish?

Lafayette Parish borders 5 counties, derived from Census county geometry. Radon potential follows geology rather than county lines, so a bordering county's report can be relevant.

What these figures mean if you own, buy, sell or rent

The reported-test figures on this page describe Lafayette Parish, Louisiana in 2022. They describe tests other people carried out in other buildings, and none of them measures yours.

  • If you own your home

    Test the lowest lived-in level; a short-term kit screens in days, a long-term kit reflects the year.

    How to test a home
  • If you are buying

    Ask for past results and any system's post-mitigation test, and test during the sale.

    Buying a house: radon guide
  • If you are selling

    Testing before you list puts the timing in your hands; disclosure rules differ by state.

    Selling a house: radon guide
  • If you rent, or rent out a home

    A tenant can test; a fix is the owner's to make, and duties differ by state.

    Radon in rental homes

How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.

Lafayette Parish, Products

Testing and mitigation products

Whatever the figures for Lafayette Parish show, only a test tells you about one home.

Lafayette Parish / Next steps

What to do next

Informational. Follow EPA guidance. EPA says all radon tests should be taken for a minimum of 48 hours, with windows and doors closed from 12 hours before a short-term test.