Marion, TX Radon Mitigation and Testing

Q: What EPA Radon Zone is Marion in?

Marion is in Guadalupe County, EPA Zone 3.

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.

Guadalupe County

EPA Zone 3

Situated in Guadalupe County within the San Antonio metropolitan area, Marion sits atop Edwards Plateau limestone formations that can create variable radon conditions. Limited testing data makes it difficult to assess local radon patterns for this growing community. Despite Texas's generally lower radon risk, homeowners should consider testing as limestone bedrock can occasionally produce elevated readings.

Marion, TX Radon Mitigation

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

Marion, TX Radon Testing

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

Marion Radon Facts

Key details about the radon risk profile for Marion and the 78124 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Guadalupe County, TX

Zip Code

78124

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Marion and the 78124 zip code are located in Guadalupe County, which has an EPA assigned Radon Zone of 3. A radon zone of 3 predicts an average indoor radon screening level less than 2 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Marion, TX

What EPA Radon Zone is Marion in?

Marion and the 78124 zip code are in Guadalupe County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 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 Texas

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

City	Avg User Radon Level	Submissions
Lubbock	12.67 pCi/L	9
San Antonio	6.57 pCi/L	7
Austin	6.14 pCi/L	7
Dallas	8.00 pCi/L	5
Abilene	4.50 pCi/L	2
Houston	3.50 pCi/L	2
Plano	6.00 pCi/L	1
Frisco	3.00 pCi/L	1
Nacogdoches	No submissions	0