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County radon report

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Locations and reports

Radon in Manchester, New Hampshire

Manchester, New Hampshire lies in Hillsborough, which EPA places in Zone 2, moderate predicted potential. Radon data is published by county, so this page reads Hillsborough's figures.

New HampshireAbout 116,818 people

What this means for you

  • Your area: EPA rates Hillsborough, where Manchester is, Zone 2, the middle 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 610 radon tests reported to CDC for Hillsborough (2021), 41.5% 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.
How to testFind a certified tester

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.

Manchester, What is published

What is published for Manchester

Information:

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 Manchester, so every radon figure on this page belongs to a county and is labelled with it. Only a test tells you about one home.

Hillsborough has an EPA zone and its own CDC test figures, shown below. About 116,818 people live in Manchester.

Manchester, Counties

The county Manchester lies in

Measured

Each county's own EPA zone and its own published CDC figures for 2021, 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.

HillsboroughZone 2Moderate predicted potential

41.5%
Reported tests at or above 4 pCi/L, 2021
3.2 pCi/L
Median reported result
610 tests
Tests reported to CDC
4
Annual years on file

The median reported pre-mitigation result for 2021 was 3.2 pCi/L in Hillsborough.

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, 2021.

Manchester, Local resources

Local resources for Manchester

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

New Hampshire Radon Program

New Hampshire Department of Health and Human Services

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

Licensing of radon professionals
There is no requirement in New Hampshire for those professionals testing for radon to be certified but it is recommended to use a nationally certified radon measurement professional especially if a real estate transaction is involved.
Visit the program's page(opens in a new tab)

Test kits

The program says: The NH Radon Program provides free radon test kits to NH residents.

Free and low-cost kitsCompare kits

Radon professionals

Radon testers and mitigators in New Hampshire, each with how its listing was checked.

Professionals in New Hampshire

Manchester, Questions

Questions about radon in Manchester

What radon zone is Manchester in?

EPA's Map of Radon Zones classifies counties, not cities. Hillsborough is in Zone 2 (moderate 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 Manchester's counties?

For 2021, the share of radon tests reported to CDC that were at or above 4 pCi/L was 41.5% in Hillsborough (610 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 Manchester?

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 Hillsborough, the county Manchester lies in.

Manchester, Keep reading

Keep reading

Manchester / Next steps

What to do next