Fremont County, WY
The federal environmental record for Fremont County (population 39,815): what is on file, where it is, and what remains open. Sources and retrieval dates are on the methodology page.
0
Superfund NPL sites
5
federal cleanup sites
1
PFAS-detecting water systems
1
TRI facilities
31
open tank releases
Drinking water: PFAS testing
Public water systems serving Fremont 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 |
|---|---|---|
| RIVERTON, CITY OF WY5600047 | PFHxS: 37 ng/L PFHxA: 28 ng/L PFPeA: 19 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
1 facilities in Fremont filed TRI reports for 2024, totalling 2k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| CHEMTRADE REFINERY SERVICES INC | RIVERTON | Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 2k lb |
Underground fuel tanks
EPA's UST Finder records 305 tank facilities in Fremont: 101 tanks in service and 679 closed. 160 fuel releases are on record, of which 31 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Fremont 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 Fremont, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- BLM-OLD LYSITE LANDFILLLYSITE
- FORT WASHAKIE CHEMICALSFORT WASHAKIE
- GREEN MOUNTAIN GROUP (TRONOX)JEFFREY CITY
- PAVILLION AREA GROUND WATER STUDYPAVILLION
- PLUNKETT OIL FIELDETHETE