Plymouth, IN Radon Mitigation and Testing

Q: What EPA Radon Zone is Plymouth in?

Plymouth is in Marshall County, EPA Zone 1.

Q: How much does radon mitigation cost in Plymouth?

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

Marshall County

EPA Zone 1

Located in Marshall County within the South Bend Metro area, Plymouth serves zip code 46563 in northern Indiana. While comprehensive local radon data is currently limited, the area's glacial deposits over limestone bedrock create geological conditions that can support radon accumulation. Indiana homeowners should prioritize testing given the state's generally elevated radon potential.

Plymouth, IN Radon Mitigation

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

Plymouth, IN Radon Testing

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

Plymouth Radon Facts

Key details about the radon risk profile for Plymouth and the 46563 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Marshall County, IN

Zip Code

46563

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Plymouth and the 46563 zip code are located in Marshall 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 Plymouth, IN

What EPA Radon Zone is Plymouth in?

Plymouth and the 46563 zip code are in Marshall 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 Plymouth?

Radon mitigation in Plymouth 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 Plymouth?

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 Indiana

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

City	Avg User Radon Level	Submissions
Bloomington	8.14 pCi/L	7
Kokomo	7.40 pCi/L	5
Lafayette	15.00 pCi/L	3
Valparaiso	10.00 pCi/L	3
Avon	6.00 pCi/L	3
West Lafayette	10.50 pCi/L	2
Dyer	9.50 pCi/L	2
Columbus	7.50 pCi/L	2
Noblesville	7.00 pCi/L	2
Westfield	7.00 pCi/L	2
Fishers	6.50 pCi/L	2
Corydon	6.00 pCi/L	2
Warsaw	5.50 pCi/L	2
Indianapolis	4.00 pCi/L	2
Newburgh	8.00 pCi/L	1
Logansport	7.00 pCi/L	1
Terre Haute	5.00 pCi/L	1
Muncie	4.00 pCi/L	1
Brownsburg	No submissions	0