Johnson County, TN
The federal environmental record for Johnson County (population 18,375): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
0
federal cleanup sites
1
PFAS-detecting water systems
1
TRI facilities
1
open tank releases
Drinking water: PFAS testing
Public water systems serving Johnson with at least one PFAS detection under UCMR5. The federal limit for PFOA and PFOS is 4 ng/L; EPA proposed in May 2026 to rescind the limits for the other compounds, which are shown for information.
| System | Highest results | Reading |
|---|---|---|
| MOUNTAIN CITY WATER DEPT. TN0000479 | 6:2 FTS: 9.5 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
1 facilities in Johnson filed TRI reports for 2024, totalling 43k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| TN MOUNTAIN CITY LLC | MOUNTAIN CITY | Chromium, Manganese | 43k lb |
Underground fuel tanks
EPA's UST Finder records 72 tank facilities in Johnson: 36 tanks in service and 174 closed. 59 fuel releases are on record, of which 1 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Johnson as Zone 2, moderate predicted indoor radon (2 to 4 pCi/L average). Radon and air quality are covered in depth on lung.com.
The record for one specific address
County figures blur what matters: distance. The Address Environmental Report runs these same federal datasets against one address and reports every site, tank, polluter and water result around it, with distances, in about a minute.
Get the report - $39