Sweet Grass County, MT
The federal environmental record for Sweet Grass County (population 3,763): 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
0
PFAS-detecting water systems
1
TRI facilities
2
open tank releases
Drinking water: PFAS testing
No public water system serving Sweet Grass reported a PFAS detection in the UCMR5 national testing round. Systems serving under 3,300 people were only sampled in part, so absence from this table is not proof of absence in the water.
Facilities reporting toxic releases (2024)
1 facilities in Sweet Grass filed TRI reports for 2024, totalling 374k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| STILLWATER MINING CO EAST BOULDER MINE | BIG TIMBER | Nickel compounds, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 374k lb |
Underground fuel tanks
EPA's UST Finder records 39 tank facilities in Sweet Grass: 15 tanks in service and 94 closed. 33 fuel releases are on record, of which 2 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Sweet Grass 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