Round Rock, TX Radon Mitigation and Testing

Q: What EPA Radon Zone is Round Rock in?

Round Rock is in Williamson County, EPA Zone 3.

Q: How much does radon mitigation cost in Round Rock?

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

Williamson County

EPA Zone 3

Round Rock, TX resides in Williamson 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. Testing is recommended for all homes in the 78664 zip code area.

Round Rock, TX Radon Mitigation

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

Round Rock, TX Radon Testing

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

Round Rock Radon Facts

Key details about the radon risk profile for Round Rock and the 78664 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Williamson County, TX

Zip Code

78664

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Round Rock and the 78664 zip code are located in Williamson 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 Round Rock, TX

What EPA Radon Zone is Round Rock in?

Round Rock and the 78664 zip code are in Williamson 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 Round Rock?

Radon mitigation in Round Rock 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 Round Rock?

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