San Antonio, TX Radon Mitigation and Testing

Q: What is the average radon level in San Antonio, TX?

Based on 8 user-submitted tests, the average radon level is 8.10 pCi/L.

Q: What EPA Radon Zone is San Antonio in?

San Antonio is in Bexar County, EPA Zone 3.

Q: How much does radon mitigation cost in San Antonio?

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

Avg: 8.10 pCi/L

Bexar County

EPA Zone 3

8 user tests

San Antonio is located in Bexar County, Texas. With 8 user-submitted readings averaging 8.10 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 78201 zip code.

8.10

pCi/L average

Above EPA Action Level

Based on 8 user-submitted radon tests for homes in San Antonio, TX. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

San Antonio, TX Radon Mitigation

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

San Antonio, TX Radon Testing

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

San Antonio, Texas Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
3 pCi/L	San Antonio, TX	0-20 Years	No Basement/All Slab	May 2023
3 pCi/L	San Antonio, TX	0-20 Years	No Basement/All Slab	Dec 2022
8 pCi/L	San Antonio, TX	21-50 Years	No Basement/All Slab	Nov 2022
5 pCi/L	San Antonio, TX	21-50 Years	No Basement/All Slab	Oct 2022
7 pCi/L	San Antonio, TX	—	No Basement/All Slab	Nov 2020

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

San Antonio Radon Facts

Key details about the radon risk profile for San Antonio and the 78201 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Bexar County, TX

Zip Code

78201

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Avg. User Submitted Level

8.10 pCi/L

User Tests Submitted

San Antonio and the 78201 zip code are located in Bexar 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 San Antonio, TX

What is the average radon level in San Antonio, TX?

Based on 8 user-submitted tests, the average radon level in San Antonio is 8.10 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 San Antonio in?

San Antonio and the 78201 zip code are in Bexar 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 San Antonio?

Radon mitigation in San Antonio 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 San Antonio?

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