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County radon rundown

Radon in Belknap County, NH

EPA ZONE2
Moderate radon potentialEPA predicts an average indoor screening level of 2 to 4 pCi/L for Zone 2 counties. That's an average across the county, not your home: many Zone 2 homes test above the 4 pCi/L action level.
Source: EPA Map of Radon Zones

Where Zone 2 sits on the radon scale

What testing shows in New Hampshire

39%
of New Hampshire residences tested reported elevated radon (2007–2025 test data).
5.9 pCi/L
estimated average indoor radon in NH, vs. 1.3 pCi/L nationally.
>100 pCi/L
readings have been reported in every NH county.

Source: NH DHHS Radon Program, “Residential Radon Risk: Local Levels and Testing Rates,” data brief, July 2026.

Test your home

A county zone can't tell you what's in your house. Neighbors can have very different readings, so testing is the only way to know.

Short-term test kitCharcoal kit, 2 to 7 days in your lowest lived-in room, then mailed to a lab.
[affiliate slot: test kit]
Long-term test kit90+ days, a better picture of your year-round average.
[affiliate slot: long-term kit]
Digital radon monitorPlug-in or battery monitor that shows levels continuously.
[affiliate slot: monitor, e.g. Airthings]

New Hampshire residents can order a free radon test kit through the state program at aelabs.com/nh (per NH DHHS).

What to do with your result

  1. Below 2 pCi/L: retest every couple of years or after renovations.
  2. 2 to 4 pCi/L: EPA says consider fixing your home.
  3. 4 pCi/L or higher: EPA recommends fixing your home. Confirm with a second test, then contact a certified radon mitigation professional. A typical fix is a sub-slab vent fan system.
  4. On a private well? Consider testing your well water for radon too.

Source: EPA A Citizen's Guide to Radon.

Radon in the news

New Hampshire stories (no recent Belknap County stories found)

Headlines link to the original publishers via Google News. Updated 2026-10-27.

Nearby counties

All New Hampshire counties

Sources