Big Horn County, MT
The federal environmental record for Big Horn County (population 12,751): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
2
federal cleanup sites
0
PFAS-detecting water systems
2
TRI facilities
30
open tank releases
Drinking water: PFAS testing
No public water system serving Big Horn 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)
2 facilities in Big Horn filed TRI reports for 2024, totalling 114k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| HARDIN GENERATING STATION | HARDIN | Barium And Barium Compounds, Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 114k lb |
| DECKER COAL CO | DECKER | Lead | 0 lb |
Underground fuel tanks
EPA's UST Finder records 137 tank facilities in Big Horn: 78 tanks in service and 330 closed. 112 fuel releases are on record, of which 30 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Big Horn 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 Big Horn, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- LODGE GRASS DRUMSLODGE GRASS
- USBR YELLOWTAIL DAM AND POWER PLANTFORT SMITH