Chelmsford, MA Radon Mitigation and Testing
Residential properties in Middlesex County's Chelmsford community show an average radon concentration of 14.5 pCi/L, significantly exceeding the EPA's 4.0 pCi/L action threshold. This suburban Boston Metro area town, served by zip code 01824, sits over granite bedrock known for elevated radon production. Homeowners should prioritize professional mitigation given these concerning levels in local testing data.
Based on 4 user-submitted radon tests for homes in Chelmsford, MA. The EPA recommends taking action at or above 4.0 pCi/L.
Chelmsford, MA Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
Chelmsford, MA Radon Testing
Finding qualified radon testing professionals is the first step toward protecting your home.
Chelmsford, Massachusetts Radon Levels
User-submitted radon test readings from homes in the Chelmsford area.
| Radon Level | City | Home Age | Foundation | Submitted |
|---|---|---|---|---|
| 18 pCi/L | Chelmsford, MA | 51-99 Years | Full Basement | Nov 2025 |
| 9 pCi/L | Chelmsford, MA | 51-99 Years | Full Basement | Feb 2021 |
| 13 pCi/L | Chelmsford, MA | 21-50 Years | Full Basement | Jan 2016 |
Have a radon test result for Chelmsford? Submit your reading to help other homeowners.
Chelmsford Radon Facts
Key details about the radon risk profile for Chelmsford and the 01824 zip code area.
Chelmsford and the 01824 zip code are located in Middlesex County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.
Radon FAQ for Chelmsford, MA
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Most Active Radon Markets in Massachusetts
Cities with the most user-submitted radon test data in the state.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Littleton | 9.40 pCi/L | 5 |
| Gloucester | 8.40 pCi/L | 5 |
| Florence | 7.40 pCi/L | 5 |
| Douglas | 12.00 pCi/L | 4 |
| Weymouth | 8.50 pCi/L | 4 |
| Mashpee | 5.00 pCi/L | 4 |
| Natick | 5.00 pCi/L | 4 |
| Worcester | 17.67 pCi/L | 3 |
| Attleboro | 10.00 pCi/L | 3 |
| Stoneham | 9.67 pCi/L | 3 |
| Hopkinton | 9.33 pCi/L | 3 |
| Medford | 8.00 pCi/L | 3 |
| Boxford | 6.67 pCi/L | 3 |
| Reading | 5.67 pCi/L | 3 |
| Haverhill | 5.00 pCi/L | 3 |
| Melrose | 5.00 pCi/L | 3 |
| Somerville | 4.33 pCi/L | 3 |
| Woburn | 19.00 pCi/L | 2 |
| Marlborough | 13.50 pCi/L | 2 |
| Cohasset | 11.50 pCi/L | 2 |