Ravalli County, MT
The federal environmental record for Ravalli County (population 47,738): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
1
federal cleanup sites
1
PFAS-detecting water systems
2
TRI facilities
0
open tank releases
Drinking water: PFAS testing
Public water systems serving Ravalli 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 |
|---|---|---|
| HAMILTON CITY OF MT0000234 | PFBS: 3.1 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
2 facilities in Ravalli filed TRI reports for 2024, totalling 21k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| LUBRIZOL | VICTOR | Xylene (mixed isomers) | 17k lb |
| CORIXA CORP D/B/A GLAXOSMITHKLINE VACCINES - HAMILTON | HAMILTON | Chloroform, Methanol | 4k lb |
Underground fuel tanks
EPA's UST Finder records 103 tank facilities in Ravalli: 63 tanks in service and 240 closed. 80 fuel releases are on record, of which 0 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Ravalli as Zone 1, the highest predicted indoor radon levels (over 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 - $39All federal cleanup sites on file
The wider Superfund enterprise inventory (SEMS) for Ravalli, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- USDA FS WEST FORK RANGER STATIONDARBY