Clean Water Act discharge permit · NPDES OK0044601
PHILLIPS 66 CO-DUNCAN REFINERY, Duncan, OK: NPDES OK0044601 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
PHILLIPS 66 CO-DUNCAN REFINERY, held by Phillips 66 Co-Duncan Refinery, holds NPDES permit OK0044601, which discharges to 611200 Red R. Basin(Upper)/Claridy. EPA’s file records it issued July 22, 2011 and expiring June 30, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | PHILLIPS 66 CO-DUNCAN REFINERY |
|---|---|
| Permittee as filed | Phillips 66 Co-Duncan Refinery |
| NPDES ID | OK0044601 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 22, 2011 |
| Expiration date | June 30, 2015 |
| Issuing agency | ODEQ |
| Address | Duncan, OK 73529 |
| Receiving water | 611200 Red R. Basin(upper)/Claridy |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Willow creek (HUC 111302080302) |
| SIC | 1311 – Crude Petroleum And Natural Gas |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 12Pollutants on file
- 11Under a numeric limit
- 12With a violation of any kind
- 3With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Benzene | 1 | 12 | 6 | August 31, 2010 | 720% over the limit |
| Oxygen, dissolved [DO] | 3 | 6 | 3 | June 30, 2014 | 46% over the limit |
| Oil and grease, hexane extr method | 1 | 7 | 2 | January 31, 2014 | 99,999% over the limit |
| pH | 2 | 11 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 11 | 0 | ||
| Phenolics, total recoverable | 1 | 5 | 0 | ||
| Turbidity, lab, NTU | 1 | 3 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 3 | 2 | 0 | ||
| Chloride [as Cl] | 1 | 2 | 0 | ||
| Solids, total dissolved- 180 deg. C | 1 | 2 | 0 | ||
| Solids, total suspended | 0 | 2 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 1 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES OK0044601.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, OK0044601.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID OK0044601 there.
Nearby on the register
- Discharge permits in Duncan
- Every permit record in Duncan, A to Z
- Discharge permits in Oklahoma
- Every permit record in Oklahoma, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.