Clean Water Act discharge permit · NPDES OK0000256
PHILLIPS 66 COMPANY-PONCA CITY REFINERY, Ponca City, OK: NPDES OK0000256 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
PHILLIPS 66 COMPANY-PONCA CITY REFINERY, held by Phillips 66 Company-Ponca City Refinery, holds NPDES permit OK0000256, which discharges to 621200 Arkansas-001/Omaha Ck-002/ Hoover Ditch-003. EPA’s file records it issued December 16, 2016 and expiring December 31, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | PHILLIPS 66 COMPANY-PONCA CITY REFINERY |
|---|---|
| Permittee as filed | Phillips 66 Company-Ponca City Refinery |
| NPDES ID | OK0000256 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 16, 2016 |
| Expiration date | December 31, 2021 |
| Issuing agency | ODEQ |
| Address | Ponca City, OK 74601 |
| Receiving water | 621200 Arkansas-001/Omaha Ck-002/ Hoover Ditch-003 |
| Subwatershed | City of Ponca City-Arkansas River (HUC 110600010504) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 35Pollutants on file
- 28Under a numeric limit
- 33With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| pH | 12 | 55 | 27 | July 31, 2025 | |
| Sulfide, total [as S] | 4 | 24 | 12 | September 30, 2025 | 358% over the limit |
| Oxygen demand, chem. [high level] [COD] | 8 | 28 | 10 | March 31, 2021 | 94% over the limit |
| Oil and grease, hexane extr method | 8 | 26 | 8 | June 30, 2026 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 17 | 5 | March 31, 2021 | 93% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 22 | 2 | March 31, 2005 | 136% over the limit |
| Solids, total suspended | 9 | 23 | 1 | June 30, 2019 | 39% over the limit |
| Flow, in conduit or thru treatment plant | 8 | 18 | 0 | ||
| Solids, total dissolved- 180 deg. C | 5 | 18 | 0 | ||
| Phenolics, total recoverable | 4 | 14 | 0 | ||
| Chromium, total [as Cr] | 4 | 12 | 0 | ||
| Chromium, hexavalent [as Cr] | 4 | 8 | 0 | ||
| Selenium, total [as Se] | 4 | 8 | 0 | ||
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 2 | 5 | 0 | ||
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 2 | 5 | 0 | ||
| % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C | 2 | 5 | 0 | ||
| Oil & Grease | 1 | 4 | 0 | ||
| Benzene | 1 | 4 | 0 | ||
| Carbon, tot organic [TOC] | 0 | 4 | 0 | ||
| pH range excursions, > 60 minutes | 0 | 4 | 0 | ||
| pH range excursions, monthly total accum | 0 | 4 | 0 | ||
| LC50 Static Renewal 48Hr Acute Daphnia pulex | 0 | 4 | 0 | ||
| LC50 Static Renewal 48Hr Acute Daphnia magna | 1 | 3 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Daphnia magna | 1 | 3 | 0 | ||
| Daphnia Magna % Mortality 48 Hr Acute | 1 | 3 | 0 | ||
| BTEX | 1 | 2 | 0 | ||
| Chlorine, total residual | 1 | 2 | 0 | ||
| Total Petroleum Hydrocarbons - Diesel | 1 | 2 | 0 | ||
| Total Petroleum Hydrocarbons - Gasoline | 1 | 2 | 0 | ||
| Toluene | 0 | 2 | 0 | ||
| LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex | 0 | 2 | 0 | ||
| %Mortality Static Renewal 48Hr Acute Daphnia Pulex | 0 | 2 | 0 | ||
| Whole effluent toxicity | 1 | 1 | 0 | ||
| Whole effluent toxicity - retest #1 | 2 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 2 | 0 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 26, 2026 | Effluent Violations - Unapproved Bypass | ST6 |
| June 19, 2019 | Permit Violations - Violation Specified in Comment | ST6 |
| February 14, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
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.
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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 OK0000256 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.