Locations and reports
Radon Levels in St. Martin Parish, Louisiana
What this means for you
- Your area: EPA rates St. Martin 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 3 radon tests reported to CDC for St. Martin Parish (2017), 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 2017, 0.0% of the radon tests reported to CDC for St. Martin Parish, Louisiana came back at or above the EPA action level of 4 pCi/L, and the median result was 0.6 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 St. Martin Parish, 2017
- Tests reported
- 3
- At or above 4 pCi/L
- 0.0%
- Median result
- 0.6 pCi/L
Of 3 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.
| Result band | Tests Calculated by Radon411 | Share Measured |
|---|---|---|
| Under 2 pCi/L | 3 | 100.0% |
| 2 to 4 pCi/L | 0 | 0.0% |
| 4 pCi/L and above | 0 | 0.0% |
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: 2017. Measured data period: 2006 to 2017 (every CDC figure on file).
St. Martin Parish, In figures
St. Martin Parish in figures
What the published data says about St. Martin Parish, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places St. Martin Parish in Zone 3, lower predicted potential, as it does 63 other counties of Louisiana's 64.
Of the 7 bordering counties, EPA places Assumption Parish, Iberia Parish, Iberville Parish, Lafayette Parish, Pointe Coupee Parish, St. Landry Parish and St. Mary Parish in Zone 3.
Reported tests
MeasuredCDC has annual figures for St. Martin Parish for 2 years, 2016 to 2017. In 2017, 0.0% of 3 reported tests were at or above 4 pCi/L.
Local record
Louisiana's radon program and its page are under Local resources.
The county's largest incorporated places are Broussard, Morgan City and Breaux Bridge; the figures here cover them as part of the county.
St. Martin Parish, Reported testing
Reported testing over time
Measured| Year | Median reported result | Highest reported result | Share of tests at or above 4 pCi/L |
|---|---|---|---|
| 2016 | 0.8 pCi/L | 0.8 pCi/L | 0.0% |
| 2017 | 0.6 pCi/L | 0.6 pCi/L | 0.0% |
What these figures count
Every percentage here is a share of radon tests reported to CDC for St. Martin Parish in 2017. It is not a share of homes in St. Martin 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 (3 for 2017). CDC also reports the number of buildings tested (1), a different count, so the two totals are not interchangeable.
St. Martin Parish, Comparison
How St. Martin Parish compares
MeasuredSt. Martin Parish's own published CDC figures beside those of the counties that border it, for the same period.
Share of reported tests at or above 4 pCi/L
Measured2017, highest first. Each county’s own published CDC figure.
- Lafayette ParishLA135 tests26.7%
- St. Martin ParishThis page3 tests0.0%
Median reported result
Measured2017, highest first. Each county’s own published CDC figure.
- Lafayette ParishLA135 tests2.0 pCi/L
- St. Martin ParishThis page3 tests0.6 pCi/L
Each figure is that county’s own published CDC figure for 2017, counting radon tests reported to CDC, not homes. St. Martin Parish is this page. Nothing is averaged or combined across counties. The test count beside each county is CDC’s published number of pre-mitigation tests behind its figures. Figures from few tests can swing widely from year to year. No published CDC figure for 2017: St. Landry Parish, LA; Iberia Parish, LA; Iberville Parish, LA; Pointe Coupee Parish, LA; St. Mary Parish, LA; Assumption Parish, LA. Every Louisiana county’s own figure is in the Louisiana county table.
CDC publishes this figure only for counties here, so there is no state or national number to compare St. Martin Parish, Louisiana with.
St. Martin Parish, Bordering counties
Counties bordering St. Martin Parish
Calculated by Radon4117 counties share a boundary with St. Martin 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 ParishLAZone 3: Lower predicted potential
- St. Landry ParishLAZone 3: Lower predicted potential
- Iberia ParishLAZone 3: Lower predicted potential
- Iberville ParishLAZone 3: Lower predicted potential
- Pointe Coupee ParishLAZone 3: Lower predicted potential
- St. Mary ParishLAZone 3: Lower predicted potential
- Assumption ParishLAZone 3: Lower predicted potential
St. Martin 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 LouisianaSt. Martin Parish, Cities and towns
Cities and towns in St. Martin Parish
The radon figures on this page are for St. Martin Parish as a whole. They do not differ by city or town.
- Broussard (part)
- Morgan City (part)
- Breaux Bridge
- St. Martinville
- Henderson
- Arnaudville (part)
- Parks
7 incorporated places, as listed in the U.S. Census Bureau’s 2020 place reference files. “(part)” marks a place that extends into another county.
St. Martin Parish, Questions
Questions about radon in St. Martin Parish
Common questions8 questions, answered from the figures above
Are radon levels high in St. Martin Parish?
In 2017, 0.0% of the radon tests reported to CDC for St. Martin Parish, Louisiana were at or above 4 pCi/L, and the median reported pre-mitigation result was 0.6 pCi/L. That is a share of reported tests, not of homes. EPA places St. Martin 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.
How do I get a radon test in St. Martin 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 St. Martin 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 St. Martin Parish?
No listed mitigator names St. Martin 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 St. Martin Parish in?
EPA places St. Martin 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 St. Martin 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 St. Martin Parish?
St. Martin Parish borders 7 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 St. Martin Parish, Louisiana in 2017. They describe tests other people carried out in other buildings, and none of them measures yours.
- How to test a home
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.
- Buying a house: radon guide
If you are buying
Ask for past results and any system's post-mitigation test, and test during the sale.
- Selling a house: radon guide
If you are selling
Testing before you list puts the timing in your hands; disclosure rules differ by state.
- Radon in rental homes
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.
How long a test has to run, under what conditions, and what EPA says a result means: the testing standard, in full.
St. Martin Parish, Products
Testing and mitigation products
Whatever the figures for St. Martin Parish show, only a test tells you about one home.
Testing
- Short-term test kitsPassive detectors exposed for a few days under closed-building conditions, then analyzed by a lab.
- Long-term test kitsDetectors exposed for more than 90 days, for a closer picture of the annual average.
- Continuous monitorsPowered devices that log radon on a repeating cycle, often used for transaction tests.
- Digital detectorsConsumer devices that display a running radon reading without a lab.
- Water radon testsKits for radon dissolved in well water, analyzed by a lab.
Mitigation
- Mitigation fansThe inline fan that keeps a soil depressurization system running, sized by the installer.
- System indicatorsU-tube manometers and fan alarms that show whether a mitigation system is still working.
- Sealing materialsCrack, joint and sump sealing used alongside a mitigation system, not instead of one.
St. Martin Parish / Next steps
What to do next
Learn
Know what radon is
What radon is, how it gets indoors, and why a county zone is not a reading for your home.
Learn about radonTest
Test the building you live in
Short-term or long-term, where the device goes, and closed-house conditions.
How to testFix
Bring a high level down
How a mitigation system works, and the retest that confirms it.
How mitigation worksFind a pro
Hire a certified professional
Measurement and mitigation professionals by state, with their certifications.
Find a professional
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.