Monrovia, MD Radon Mitigation and Testing

Q: What EPA Radon Zone is Monrovia in?

Monrovia is in Frederick County, EPA Zone 1.

Q: How much does radon mitigation cost in Monrovia?

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

Frederick County

EPA Zone 1

Located in Frederick County within the Washington Metro area (21770), Monrovia sits on the Piedmont plateau where crystalline bedrock formations can contribute to elevated radon levels. While specific testing data is limited, the area's growing suburban development and geological characteristics suggest residents should prioritize radon testing, particularly in newer homes with basements.

Monrovia, MD Radon Mitigation

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

Monrovia, MD Radon Testing

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

Monrovia Radon Facts

Key details about the radon risk profile for Monrovia and the 21770 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Frederick County, MD

Zip Code

21770

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Monrovia and the 21770 zip code are located in Frederick 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 Monrovia, MD

What EPA Radon Zone is Monrovia in?

Monrovia and the 21770 zip code are in Frederick 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 Monrovia?

Radon mitigation in Monrovia 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 Monrovia?

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