Chelmsford, MA Radon Levels

Q: What is the average radon level in Chelmsford, MA?

Based on 4 user-submitted tests, the average radon level is 11.50 pCi/L.

Q: What EPA Radon Zone is Chelmsford in?

Chelmsford is in Middlesex County, EPA Zone 1.

Q: How much does radon mitigation cost in Chelmsford?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Chelmsford radon levels and find certified testing and mitigation professionals to keep your home safe

Chelmsford, MA Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Middlesex County, MA

Zip Code 01824

Avg. User Level 11.50 pCi/L

User Tests 4

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.

11.50

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Chelmsford, MA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Chelmsford, MA Radon Mitigation

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Chelmsford, MA Radon Levels

User-submitted radon test readings from homes in the Chelmsford area.

Radon Level	City	Home Age	Foundation
18 pCi/L	Chelmsford, MA	51-99 Years	Full Basement
9 pCi/L	Chelmsford, MA	51-99 Years	Full Basement
13 pCi/L	Chelmsford, MA	21-50 Years	Full Basement

Have a radon test result for Chelmsford? Submit your reading to help other homeowners.

Radon Readings Near Chelmsford, MA

Compare radon levels in Chelmsford with the closest nearby cities that have user-submitted test data.

City	Distance	Avg User Level	Readings
North Billerica	3.5 mi	6.50 pCi/L	2
Lowell	4.1 mi	3.00 pCi/L	2
Westford	4.3 mi	12.67 pCi/L	3
Dracut	6.2 mi	13.00 pCi/L	1
Tyngsboro	6.4 mi	4.50 pCi/L	2
Tewksbury	6.8 mi	4.33 pCi/L	3
Littleton	7.6 mi	9.40 pCi/L	5
Acton	9.3 mi	20.00 pCi/L	1

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.

Radon FAQ for Chelmsford, MA

What is the average radon level in Chelmsford, MA?

Based on 4 user-submitted tests, the average radon level in Chelmsford is 11.50 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Chelmsford in?

Chelmsford and the 01824 zip code are in Middlesex County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Chelmsford?

Radon mitigation in Chelmsford typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Chelmsford?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.

Chelmsford, MA Radon Levels

Check local Chelmsford radon levels and find certified testing and mitigation professionals to keep your home safe

Chelmsford, MA Radon Facts

Chelmsford, MA Radon Mitigation

Need Radon Mitigation or Testing in Chelmsford?

Chelmsford, MA Radon Levels

Radon Readings Near Chelmsford, MA

Middlesex County Radon Profile

Radon FAQ for Chelmsford, MA

Nearby Cities

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