Stephens County, OK
The federal environmental record for Stephens County (population 44,014): 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
1
PFAS-detecting water systems
8
TRI facilities
8
open tank releases
Drinking water: PFAS testing
Public water systems serving Stephens 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 |
|---|---|---|
| DUNCAN PUBLIC UTILITIES AUTHORITY OK1010809 | PFBA: 7.5 ng/L PFPeA: 3.8 ng/L PFHpA: 3.4 ng/L | detected |
On a system with detections? Testing and treatment options
Facilities reporting toxic releases (2024)
8 facilities in Stephens filed TRI reports for 2024, totalling 74k lb released.
| Facility | City | Top chemicals | Total released |
|---|---|---|---|
| VELMA GAS PLANT | VELMA | n-Hexane, Cyclohexane | 63k lb |
| DCP MIDSTREAM LP/SHOLEM GAS PLANT | DUNCAN | n-Hexane, Cyclohexane | 9k lb |
| FLOTEK CHEMISTRY LLC | MARLOW | Methanol, Certain glycol ethers | 2k lb |
| HALLIBURTON MANUFACTURING & LEASING CO LLC | DUNCAN | Ethylene glycol, Manganese | 768 lb |
| SENSIA LLC | DUNCAN | - | 0 lb |
| HALLIBURTON DUNCAN FIELD CAMP | DUNCAN | - | 0 lb |
| SOLITAIRE HOMES INC. | DUNCAN | - | 0 lb |
| DUNCAN #2 BATCH PLANT | DUNCAN | - | 0 lb |
Underground fuel tanks
EPA's UST Finder records 207 tank facilities in Stephens: 117 tanks in service and 436 closed. 58 fuel releases are on record, of which 8 remain open. Open releases are cleanups that have not reached "no further action".
Radon
EPA maps Stephens as Zone 3, the lowest predicted indoor radon (under 2 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 Stephens, including sites assessed but never listed. Presence here records that EPA had reason to look, not a finding of danger.
- SANNER PIPE AND SALVAGE LLCVELMA
- TOSCO CORP DUNCAN REFINERYDUNCAN