Locations and reports
Radon Levels in Bristol Bay, Alaska
What this means for you
- Your area: EPA rates Bristol Bay 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: CDC has published no radon test results for Bristol Bay.
- 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.
EPA's Map of Radon Zones places Bristol Bay, Alaska in Zone 3, lower predicted potential, a prediction for the whole county. 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: Moderate across 98% of the county's land area
Predicted: EPA Map of Radon Zones
Measured: tests reported to CDC
CDC has published no radon test figures for Bristol Bay. Only a test tells you the level in a home.
Bristol Bay, In figures
Bristol Bay in figures
What the published data says about Bristol Bay, in words. A zone and a share of tests describe an area, never the level in any one home.
Predicted
PredictedEPA places Bristol Bay in Zone 3, lower predicted potential, as it does 19 other counties of Alaska's 29.
Of the 1 bordering county, EPA places Lake and Peninsula in Zone 3.
Reported tests and local record
CDC has no annual testing figure for Bristol Bay on file here.
Alaska's radon program is the Alaska Radon Program, run by Alaska Division of Geological & Geophysical Surveys; its contacts are under Local resources.
Bristol Bay, Bordering counties
Counties bordering Bristol Bay
Calculated by Radon411One county shares a boundary with Bristol Bay, 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.
Bristol Bay, Local resources
Local resources in Alaska
Who to ask in Alaska: the state's radon program, test kits and professionals.
Alaska Radon Program
Alaska Division of Geological & Geophysical Surveys
Alaska’s radon program answers questions about testing, mitigation and the rules where you live.
- Phone
- 907-269-6401
- paul.goodfellow@alaska.gov
Test kits
The program says: Please register your interest in a free radon testing kit on our website and we will resume mailing out tests starting in December 2026.
Radon professionals
No professionals are listed in Alaska yet. The state program can point you to registered testers and mitigators.
See the Alaska directoryBristol Bay, Questions
Questions about radon in Bristol Bay
Common questions8 questions, answered from the figures above
Are radon levels high in Bristol Bay?
No CDC testing statistics are published here for Bristol Bay, Alaska yet. EPA places Bristol Bay 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 Bristol Bay?
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 Bristol Bay as a service area yet. The Alaska 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 stateAlaska radon program
Who does radon mitigation in Bristol Bay?
Radon411 has no certified mitigators listed for Alaska yet. 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 Alaska requires one.
How radon mitigation worksWhat mitigation costsAlaska radon program
What EPA radon zone is Bristol Bay in?
EPA places Bristol Bay, Alaska 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 Bristol Bay?
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 Bristol Bay?
Bristol Bay borders 1 county, 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 EPA zone on this page describes Bristol Bay as a whole. It is a prediction for an area, and it does not measure your building.
- 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.
Bristol Bay, Products
Testing and mitigation products
Whatever the figures for Bristol Bay 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.
Bristol Bay / 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.