Waltham, MA Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 4.00 pCi/L.

Q: What EPA Radon Zone is Waltham in?

Waltham is in Middlesex County, EPA Zone 1.

Q: How much does radon mitigation cost in Waltham?

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

Avg: 4.00 pCi/L

Middlesex County

EPA Zone 1

1 user test

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.

4.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Waltham, MA. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Waltham, MA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Waltham, MA Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Waltham, Massachusetts Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Waltham, MA	51-99 Years	Full Basement	Nov 2017

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

Waltham Radon Facts

Key details about the radon risk profile for Waltham and the 02451 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Middlesex County, MA

Zip Code

02451

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

4.00 pCi/L

User Tests Submitted

Waltham and the 02451 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 Waltham, MA

What is the average radon level in Waltham, MA?

Based on 1 user-submitted test, the average radon level in Waltham is 4.00 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 Waltham in?

Waltham and the 02451 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 Waltham?

Radon mitigation in Waltham 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 Waltham?

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.

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