Nashua Radon HelpRadon mitigation & testing in Milford, NH
Private wells: radon in air and water in Milford
Outside the town-water area, many Milford homes draw from private wells. That means two radon questions: what’s in your air, and what’s in your water.
How water radon reaches the air
Radon escapes from water when you shower, wash dishes or do laundry. NH DHHS estimates that every 10,000 pCi/L in water adds roughly 1 pCi/L to indoor air. (NH DHHS) The EPA says breathing radon is a much larger risk than drinking it, so test the air first. (NHDES)
NHDES guidance for well water
| Radon in water | NHDES recommendation |
|---|---|
| 10,000 pCi/L or more | Treat the water, along with air mitigation |
| 2,000–10,000 pCi/L | Water treatment may be advisable if indoor air is 4 pCi/L or higher |
| Below 4,000 pCi/L | Retest air and water every 3–5 years |
Source: NHDES. NHDES recommends at least two water tests about a month apart before choosing treatment.
Aeration vs. carbon
Because radon is a gas, treatment has to be whole-house (point-of-entry). NHDES prefers aeration. Carbon (GAC) filters can be used at or below 10,000 pCi/L if replaced every 1–2 years, because radioactivity builds up in the media. (NHDES)
Nearby
See Amherst for testing bedrock wells for uranium and gross alpha.
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