Skip to content
RADON411

Locations and reports

Radon Levels in Petroleum County, Montana

EPA puts Petroleum County in Zone 2, its middle radon zone. Homes with elevated levels occur in all three zones, so only a test measures yours.

Data checked By Radon411Methodology

Predicted
Zone 2Moderate predicted potential
Measured
No CDC figureCDC has published no radon test figures for Petroleum County.
Your home
Test to knowNo area figure here is a reading of your home.
How to test this homeFind a certified tester

The data

Petroleum County, At a glance

Petroleum County at a glance

Predicted: EPA radon zone

EPA Zone 2: moderate predicted potential

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.

What EPA predicts hereScreening level, geology

EPA predicts an average indoor of 2 to 4 pCi/L (75 to 150 Bq/m³) across the county as a whole.

USGS geologic potential: Moderate across 87% of the county's area

Predicted: EPA Map of Radon Zones

Measured: tests reported to CDC

No CDC test figures here

CDC has published no radon test figures for Petroleum County. Only a test tells you the level in a home.

Local help

Petroleum County, Local resources

Radon testing and mitigation in Petroleum County

Who tests and fixes radon in Petroleum County: listed businesses, Montana's radon program and test kits.

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.

Radon Action Brief

National Radon Action MonthPre-sale

Petroleum County's radon brief, in one dated file.

  • Your area's radon record, explained.
  • Your plan to test this week.
  • Fix costs and pros near you.

Save 64%Sale price: $8.99Price after the sale: $25Ends Jan 31Then $25

Get the Petroleum County BriefSee a free sample

Area data, not a test of the building.

What it means

Petroleum County, Questions

Questions about radon in Petroleum County

Common questions

8 questions, answered from the figures above

Are radon levels high in Petroleum County?

No CDC testing statistics are published here for Petroleum County, Montana yet. EPA places Petroleum County in Zone 2, moderate predicted potential, a predicted average indoor screening level 2 to 4 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.

Radon levels: what a result meansWhat is radon?Radon levels in Montana

How do I get a radon test in Petroleum County?

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 radon testing business listed on Radon411 has an address in Petroleum County or names it as a service area yet. The Montana radon program is the place to ask about certified testers and any test kit offer it runs.

Radon testing: how to test a homeRadon test kits comparedFree and low-cost kits by stateRadon Action Month checklistMontana radon program

Who does radon mitigation in Petroleum County?

No listed mitigator names Petroleum County as a service area yet; the Montana 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 Montana requires one.

Radon mitigation: how it worksRadon mitigation costRadon mitigation systemsMitigators in Montana

What EPA radon zone is Petroleum County in?

EPA places Petroleum County, Montana in Zone 2, which EPA describes as moderate 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 Petroleum County?

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 Petroleum County?

Petroleum County 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.

If you own, buy, sell or rent

What these figures mean for each reader, with the guide that covers it

The EPA zone on this page describes Petroleum County as a whole. It is a prediction for an area, and it does not measure your building.

Petroleum County in figures

The figures above, said in words

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

    • Predicted

      Predicted

      EPA places Petroleum County in Zone 2, moderate predicted potential, as it does 6 other counties of Montana's 56.

      Of the 5 bordering counties, EPA places Fergus County, Garfield County, Phillips County and Rosebud County in Zone 1 and Musselshell County in Zone 2.

  • Reported tests

    Measured

    CDC has no annual testing figure for Petroleum County on file here.

  • Local record

    Montana's radon program is the Radon Control Program, run by Montana DEQ; its contacts are under Local resources.

    The county's largest incorporated place is Winnett; the figures here cover them as part of the county.

Products

Petroleum County, Products

Testing and mitigation products

Whatever the figures for Petroleum County show, only a test tells you about one home.

Test kits and monitors42

See all products

As an Amazon Associate, Radon411 earns from qualifying purchases.

Best radon monitors for Petroleum County homes, compared

Testing

5

Mitigation

3

Explore

Petroleum County, Bordering counties

Counties bordering Petroleum County

Calculated by Radon411
Why bordering counties matter

5 counties share a boundary with Petroleum County, 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.

Petroleum County, Cities and towns

Cities and towns in Petroleum County

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

  • Winnett

One incorporated place, as listed in the U.S. Census Bureau’s 2020 place reference files.

Petroleum County, Next steps

What to do next

  1. LearnKnow what radon isWhat radon is, how it gets indoors, and why a county zone is not a reading for your home.Learn about radon
  2. TestTest the building you live inShort-term or long-term, where the device goes, and closed-house conditions.How to test
  3. FixBring a high level downHow a mitigation system works, and the retest that confirms it.How mitigation works
  4. Find a proHire a certified professionalMeasurement 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.