Locations and reports
Radon in Helena, Montana
EPA puts Lewis and Clark County, where Helena is, in Zone 1, its highest radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.
Data checked By Radon411Methodology
- Predicted
- Zone 1Highest predicted potential
- Measured
61.8% of 468 tests reported to CDC for Lewis and Clark County (2008 to 2017, laboratory) were at or above 4 pCi/L- Your home
- Test to knowNo area figure here is a reading of your home.
The data
Helena, What is published
What is published for Helena
Radon data is published by county, not by city
Radon data is published by county, not by city. EPA assigns radon zones to counties, and CDC publishes radon test figures by county. Neither publishes a figure for Helena, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.
Lewis and Clark County has an EPA zone and its own CDC test figures, shown below. About 35,138 people live in Helena.
Helena, Counties
The county Helena lies in
MeasuredEach county's own EPA zone and its own published CDC figures for 2008 to 2017, laboratory, the newest period any of them has. A county without a figure for that period is shown without one, never with a figure from another year.
Lewis and Clark CountyZone 1Highest predicted potential
- 61.8%
- Reported tests at or above 4 pCi/L, 2008 to 2017, laboratory
- 5.1 pCi/L
- Median reported result
- 468 tests
- Tests reported to CDC
- 0
- Annual years on file
The median reported pre-mitigation result for 2008 to 2017, laboratory was 5.1 pCi/L in Lewis and Clark County.
CDC counts radon tests that were reported to it, not homes, and figures from few tests can swing widely from year to year. Each county’s report has its full history.
Predicted: EPA Map of Radon Zones, by county. Measured: CDC tracking data, by county, 2008 to 2017, laboratory.
Radon Action Brief
National Radon Action MonthPre-sale
The radon brief for Helena, in one dated file.
- Your area's radon record, explained. EPA's zone and any CDC tests.
- Your plan to test this week. Which test, where it goes, how long.
- Fix costs and pros near you. Costs, EPA's checklist, listed pros.
Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25Sale ends January 31, then $25
Local help
Helena, Local resources
Local resources for Helena
Who to ask in Montana: its radon program, test kits and professionals.
- Radon Control ProgramMontana DEQMontana’s radon program answers questions about testing, mitigation and the rules where you live.Visit the program’s page(opens in a new tab)
- Free and low-cost kitsThe program says:
Energy Bureau staff manage the radon information toll-free hotline and distribute subsidized radon test kits to Montana residents.
- Compare kits
- Professionals in MontanaRadon testers and mitigators in Montana, each with how its listing was checked.
What Montana's program says
- Phone
- 1-800-546-0483
- Licensing of radon professionals
Montana DEQ does not certify or require proof of certification for the contractors listed.
What it means
Helena, Questions
Questions about radon in Helena
What radon zone is Helena in?
EPA's Map of Radon Zones classifies counties, not cities. Lewis and Clark County is in Zone 1 (highest predicted potential). A zone is a prediction for a whole county and never tells you the level in one home.
How many radon tests come back high in Helena's counties?
For 2008 to 2017, laboratory, the share of radon tests reported to CDC that were at or above 4 pCi/L was 61.8% in Lewis and Clark County (468 tests). Each is that county's own figure, counting tests reported to CDC, not homes. Radon411 does not average or combine them into a figure for the city.
Should I test my home in Helena?
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.
The answers use the published figures of Lewis and Clark County, the county Helena lies in.
Explore
Helena, Next steps
What to do next
What to do next: 1 of 4