Belmont, MA Radon Levels
Check local Belmont radon levels and find certified testing and mitigation professionals to keep your home safe
Belmont, MA Radon Facts
Situated in Middlesex County within the Boston Metro area, Belmont lies atop New England's complex glacial geology where granite bedrock and glacial till can produce variable radon levels. The town's housing stock includes both historic colonial homes and mid-century suburban development, many with full stone or concrete basements typical of the region. Though specific testing data for zip code 02478 is currently limited, the EPA Zone 1 designation suggests residents should test their homes, particularly older properties with stone foundations.
Middlesex County average: 7.28 pCi/L, based on 90 user-submitted tests across 46 cities in the county. No homeowner readings have been submitted for Belmont itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.
Belmont, MA Radon Mitigation
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Radon Readings Near Belmont, MA
No homeowner tests have been submitted for Belmont yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Arlington | 1.7 mi | 4.00 pCi/L | 2 |
| Waltham | 2.8 mi | 4.00 pCi/L | 1 |
| Newtonville | 3.4 mi | 3.00 pCi/L | 1 |
| Somerville | 3.7 mi | 4.50 pCi/L | 4 |
| Medford | 3.9 mi | 8.00 pCi/L | 3 |
| West Newton | 4.1 mi | 4.00 pCi/L | 1 |
| Newton Center | 4.3 mi | 4.50 pCi/L | 2 |
| Lexington | 4.3 mi | 4.33 pCi/L | 3 |
Middlesex County Radon Profile
The bedrock and soils beneath Middlesex County are classified by the EPA as Radon Zone 1, the highest-risk tier, with predicted average indoor screening levels above 4 pCi/L. Homeowner-submitted tests from 46 cities in Middlesex County average 7.28 pCi/L across 90 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Middlesex County.