Gaithersburg, MD Radon Mitigation and Testing

Q: What is the average radon level in Gaithersburg, MD?

Based on 2 user-submitted tests, the average radon level is 6.50 pCi/L.

Q: What EPA Radon Zone is Gaithersburg in?

Gaithersburg is in Montgomery County, EPA Zone 1.

Q: How much does radon mitigation cost in Gaithersburg?

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

Avg: 6.50 pCi/L

Montgomery County

EPA Zone 1

2 user tests

Gaithersburg is located in Montgomery County, Maryland. With 2 user-submitted readings averaging 6.50 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 20877 zip code.

6.50

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Gaithersburg, MD. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Gaithersburg, MD Radon Mitigation

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

Gaithersburg, MD Radon Testing

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

Gaithersburg, Maryland Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	Gaithersburg, MD	21-50 Years	Full Basement	Oct 2022
7 pCi/L	Gaithersburg, MD	0-20 Years	—	Nov 2017

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

Gaithersburg Radon Facts

Key details about the radon risk profile for Gaithersburg and the 20877 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Montgomery County, MD

Zip Code

20877

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

6.50 pCi/L

User Tests Submitted

Gaithersburg and the 20877 zip code are located in Montgomery 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 Gaithersburg, MD

What is the average radon level in Gaithersburg, MD?

Based on 2 user-submitted tests, the average radon level in Gaithersburg is 6.50 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 Gaithersburg in?

Gaithersburg and the 20877 zip code are in Montgomery 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 Gaithersburg?

Radon mitigation in Gaithersburg 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 Gaithersburg?

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 Maryland

Cities with the most user-submitted radon test data in the state.

City	Avg User Radon Level	Submissions
Frederick	8.29 pCi/L	7
Potomac	9.00 pCi/L	6
Hagerstown	8.67 pCi/L	6
Westminster	14.50 pCi/L	4
Baltimore	7.00 pCi/L	4
Annapolis	4.25 pCi/L	4
Upper Marlboro	15.00 pCi/L	3
Edgewater	12.67 pCi/L	3
Bowie	9.00 pCi/L	3
Clarksburg	8.00 pCi/L	3
Gambrills	6.00 pCi/L	3
Elkton	5.33 pCi/L	3
Silver Spring	4.33 pCi/L	3
Chesapeake Beach	14.00 pCi/L	2
Cumberland	9.00 pCi/L	2
Frostburg	9.00 pCi/L	2
Owings	5.50 pCi/L	2
Huntingtown	4.50 pCi/L	2
Mc Henry	20.00 pCi/L	1
Mount Airy	20.00 pCi/L	1