Stephenson County, IL
The federal environmental record for Stephenson County (population 43,105): 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
11
TRI facilities
30
open tank releases
Drinking water: PFAS testing
Public water systems serving Stephenson 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 |
|---|---|---|
| FREEPORT IL1770200 | PFOS: 14 ng/L | above final limit |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
11 facilities in Stephenson filed TRI reports for 2024, totalling 129k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| BERNER CHEESE CORP | DAKOTA | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 67k lb |
| MODERN PLATING CORP | FREEPORT | Zinc compounds, Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 36k lb |
| TITAN TIRE CORP OF FREEPORT | FREEPORT | Zinc compounds, Lead compounds | 13k lb |
| ADKINS ENERGY LLC | LENA | n-Hexane, Acetaldehyde | 8k lb |
| DANFOSS POWER SOLUTIONS (US) CO | FREEPORT | Ammonia, Copper | 2k lb |
| TRI STAR METALS LLC | FREEPORT | Copper, Nickel | 2k lb |
| KOLB LENA CHEESE INC. | LENA | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 1k lb |
| FORGE GROUP STAR LLC DBA STAR FREEPORT CO | FREEPORT | Manganese | 44 lb |
| HONEYWELL INTERNATIONAL INC-PLANT 1 | FREEPORT | Copper, Lead | 31 lb |
| ANCHOR-HARVEY COMPONENTS LLC | FREEPORT | Copper | 21 lb |
| HONEYWELL INTERNATIONAL INC-PLANT 4 | FREEPORT | Lead, Zinc compounds | 5 lb |
Underground fuel tanks
EPA's UST Finder records 145 tank facilities in Stephenson: 92 tanks in service and 309 closed. 106 fuel releases are on record, of which 30 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Stephenson 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 Stephenson, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- CMC PROPERTIESFREEPORT
- EASTSIDE PROPERTY-101 S. LOUISFREEPORT
- LENNON RESIDENCEFREEPORT
- MICRO SWITCH RAWLEIGH BLDGFREEPORT
- ONE HOUR CLEANERS/USEPA SUPERFUND CLEANUPFREEPORT