Marion, KS Radon Mitigation and Testing

Q: What is the average radon level in Marion, KS?

Based on 1 user-submitted tests, the average radon level is 9.00 pCi/L.

Q: What EPA Radon Zone is Marion in?

Marion is in Marion County, EPA Zone 1.

Q: How much does radon mitigation cost in Marion?

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

Avg: 9.00 pCi/L

Marion County

EPA Zone 1

1 user test

County seat of Marion County in central Kansas, Marion sits on prairie soils over sedimentary bedrock typical of the Great Plains region. The community's housing stock includes both historic downtown structures and residential neighborhoods, with foundation types ranging from full basements to crawl spaces depending on construction era. While radon testing data remains limited for this EPA Zone 1 area, individual home testing is recommended to establish property-specific baseline readings.

9.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Marion, KS Radon Mitigation

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

Marion, KS Radon Testing

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

Marion, Kansas Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
9 pCi/L	Marion, KS	21-50 Years	Full Basement	Mar 2026

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

Marion Radon Facts

Key details about the radon risk profile for Marion and the 66861 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Marion County, KS

Zip Code

66861

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

9.00 pCi/L

User Tests Submitted

Marion and the 66861 zip code are located in Marion 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 Marion, KS

What is the average radon level in Marion, KS?

Based on 1 user-submitted test, the average radon level in Marion is 9.00 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 Marion in?

Marion and the 66861 zip code are in Marion 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 Marion?

Radon mitigation in Marion 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 Marion?

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 Kansas

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

City	Avg User Radon Level	Submissions
Topeka	6.00 pCi/L	1
Overland Park	No submissions	0