Cascade County, MT
The federal environmental record for Cascade County (population 84,900): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
3
Superfund NPL sites
8
federal cleanup sites
1
PFAS-detecting water systems
3
TRI facilities
83
open tank releases
Superfund NPL sites
| Site | City | Status | Listed |
|---|---|---|---|
| ACM Smelter and Refinery | Black Eagle | on the NPL | 03/10/2011 |
| Barker Hughesville Mining District | Barker | on the NPL | 09/13/2001 |
| Carpenter Snow Creek Mining District | Neihart | on the NPL | 09/13/2001 |
Drinking water: PFAS testing
Public water systems serving Cascade 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 |
|---|---|---|
| MALMSTROM AIR FORCE BASE MT0000515 | PFBA: 7 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
3 facilities in Cascade filed TRI reports for 2024, totalling 644k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| BIG SKY SCIENTIFIC L.L.C. | SUN RIVER | Methanol | 558k lb |
| CALUMET MONTANA REFINING LLC. | GREAT FALLS | n-Hexane, Propylene | 85k lb |
| CHS GREAT FALLS FEED | GREAT FALLS | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 360 tank facilities in Cascade: 229 tanks in service and 749 closed. 323 fuel releases are on record, of which 83 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Cascade 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 Cascade, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- ACM SMELTER AND REFINERYBLACK EAGLE
- BARKER HUGHESVILLE MINING DISTRICTMONARCH
- BELT CREEK CCC CAMPNEIHART
- CARPENTER SNOW CREEK MINING DISTRICTNEIHART
- GREAT FALLS MONTANA AIR NATIONAL GUARDGREAT FALLS
- HICKORY DRUMSGREAT FALLS
- JR APPLICATIONSGREAT FALLS
- MALMSTROM AIR FORCE BASEMALSTROM AFB