Castell, TX Radon Levels
Check local Castell radon levels and find certified testing and mitigation professionals to keep your home safe
Castell, TX Radon Facts
EPA Radon Zone
Zone 2 — Moderate Risk
2–4 pCi/L (Zone 2)
County
Llano County, TX
Zip Code
76831
Nestled in Llano County in the Texas Hill Country, Castell sits atop granite bedrock of the Llano Uplift, which typically produces lower radon levels than sedimentary formations. The area's rural character includes a mix of older ranch homes and newer Hill Country properties, often built on pier-and-beam or slab foundations. With no current testing data available for zip code 76831, homeowners should still consider testing to establish individual property baselines.
Castell, TX Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Radon FAQ for Castell, TX
What EPA Radon Zone is Castell in?
Castell and the 76831 zip code are in Llano County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.
How much does radon mitigation cost in Castell?
Radon mitigation in Castell 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 Castell?
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 in Texas with the most user-submitted radon test data, ranked by number of submissions.
| City | Avg User Radon Level | Submissions |
|---|---|---|
| Lubbock | 12.70 pCi/L | 10 |
| 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 |