Johnson City, TN Radon Levels
Check local Johnson City radon levels and find certified testing and mitigation professionals to keep your home safe
Johnson City, TN Radon Facts
Located in Washington County within the Appalachian Valley, Johnson City shows an average radon level of 4.33 pCi/L based on local testing data. This reading slightly exceeds the EPA's 4.0 pCi/L action threshold, reflecting the area's limestone bedrock and valley geology that can trap radon in homes.
Based on 5 user-submitted radon tests for homes in Johnson City, TN. The EPA recommends taking action at or above 4.0 pCi/L.
Johnson City, TN Radon Mitigation
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Johnson City, TN Radon Levels
User-submitted radon test readings from homes in the Johnson City area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 4 pCi/L | Johnson City, TN | 51-99 Years | Full Basement |
| 4 pCi/L | Johnson City, TN | 0-20 Years | Full Basement |
| 5 pCi/L | Johnson City, TN | 0-20 Years | Full Basement |
Have a radon test result for Johnson City? Submit your reading to help other homeowners.
Radon Readings Near Johnson City, TN
Compare radon levels in Johnson City with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Jonesborough | 6.6 mi | 7.00 pCi/L | 2 |
| Elizabethton | 10.6 mi | 7.33 pCi/L | 3 |
| Telford | 10.8 mi | 12.00 pCi/L | 1 |
| Bluff City | 12.4 mi | 5.00 pCi/L | 1 |
| Blountville | 13.0 mi | 20.00 pCi/L | 1 |
| Limestone | 14.5 mi | 7.00 pCi/L | 1 |
| Kingsport | 14.9 mi | 5.00 pCi/L | 1 |
| Bristol | 19.2 mi | 6.50 pCi/L | 2 |
Washington County Radon Profile
Because of its underlying geology, Washington County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 5 cities in Washington County average 6.00 pCi/L across 9 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Washington County home regardless of zone or a neighbor's results.