Harper, TX Radon Mitigation and Testing

Q: What EPA Radon Zone is Harper in?

Harper is in Gillespie County, EPA Zone 3.

Q: How much does radon mitigation cost in Harper?

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

Gillespie County

EPA Zone 3

Nestled in Gillespie County within the Texas Hill Country, Harper sits on limestone terrain that can produce variable radon levels depending on local geological features and home construction details. Testing data for this 78631 zip code area remains sparse, making professional radon assessment recommended for establishing baseline indoor air quality measurements.

Harper, TX Radon Mitigation

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

Harper, TX Radon Testing

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

Harper Radon Facts

Key details about the radon risk profile for Harper and the 78631 zip code area.

EPA Radon Zone

Zone 3 — Low Risk

County

Gillespie County, TX

Zip Code

78631

Predicted Screening Level

< 2.0 pCi/L (Zone 3)

Harper and the 78631 zip code are located in Gillespie 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 Harper, TX

What EPA Radon Zone is Harper in?

Harper and the 78631 zip code are in Gillespie 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 Harper?

Radon mitigation in Harper 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 Harper?

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