Waltham, MA Radon Levels
Check local Waltham radon levels and find certified testing and mitigation professionals to keep your home safe
Waltham, MA Radon Facts
This Middlesex County city in the Boston Metro area shows an average radon level of 4.0 pCi/L, precisely matching the EPA action threshold. Waltham's dense urban development includes historic mill buildings and diverse residential neighborhoods across zip codes 02451, 02452, and 02453. The city's position on glacial till over granite bedrock creates conditions where individual properties may vary significantly from the recorded average.
Based on 1 user-submitted radon test for homes in Waltham, MA. The EPA recommends taking action at or above 4.0 pCi/L.
Waltham, MA Radon Mitigation
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Waltham, MA Radon Levels
User-submitted radon test readings from homes in the Waltham area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 4 pCi/L | Waltham, MA | 51-99 Years | Full Basement |
Have a radon test result for Waltham? Submit your reading to help other homeowners.
Radon Readings Near Waltham, MA
Compare radon levels in Waltham with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| West Newton | 2.6 mi | 4.00 pCi/L | 1 |
| Newtonville | 2.6 mi | 3.00 pCi/L | 1 |
| Arlington | 4.0 mi | 4.00 pCi/L | 2 |
| Newton Center | 4.4 mi | 4.50 pCi/L | 2 |
| Lexington | 4.4 mi | 4.33 pCi/L | 3 |
| Wellesley Hills | 5.7 mi | 8.50 pCi/L | 2 |
| Needham Heights | 6.3 mi | 4.00 pCi/L | 1 |
| Somerville | 6.4 mi | 4.50 pCi/L | 4 |
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.