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Petroleum Refining, major discharger, Delaware City, Delaware. NPDES permit DE0000256 expired Jul 31, 2023; its limits still apply. Last 12 months: over a limit 6 times (last July 2026), 12 of 120 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| December 2025 | 201 | Carbon, tot organic [TOC], daily maximum | 6 mg/L | ≤ 5 mg/L | 20% |
| February 2026 | 601 | Iron, total [as Fe], daily maximum | 4 mg/L | ≤ 3 mg/L | 33% |
| July 2026 | 601 | Solids, total suspended, daily average | 102.4 mg/L | ≤ 29 mg/L | 253% |
| July 2026 | 601 | Solids, total suspended, daily average | 8324 lb/d | ≤ 2198 lb/d | 279% |
| July 2026 | 601 | Solids, total suspended, daily maximum | 127475 lb/d | ≤ 3218 lb/d | 3861% |
| July 2026 | 601 | Solids, total suspended, daily maximum | 1548 mg/L | ≤ 43 mg/L | 3500% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 110 deg F | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Oil & Grease | daily average | ≤ 7 mg/L | all year | 001 |
| Oil & Grease | instantaneous maximum | ≤ 10 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 452 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | rolling average | ≤ 303 MGD | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .2 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 011 |
| pH | daily maximum | ≤ 9 SU | all year | 011 |
| Solids, total suspended | daily average | ≤ 22 mg/L | all year | 011 |
| Solids, total suspended | daily maximum | ≤ 40 mg/L | all year | 011 |
| Solids, total suspended | daily average | ≤ 112 lb/d | all year | 011 |
| Solids, total suspended | daily maximum | ≤ 203 lb/d | all year | 011 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 011 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 011 |
| Oil & Grease | daily average | ≤ 50 lb/d | all year | 011 |
| Oil & Grease | daily maximum | ≤ 101 lb/d | all year | 011 |
| Iron, total [as Fe] | daily average | ≤ 2 mg/L | all year | 011 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | 011 |
| Iron, total [as Fe] | daily average | ≤ 11.3 lb/d | all year | 011 |
| Iron, total [as Fe] | daily maximum | ≤ 17 lb/d | all year | 011 |
| Flow, in conduit or thru treatment plant | daily average | ≤ .675 MGD | all year | 011 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 011 |
| pH | daily minimum | ≥ 6 SU | all year | 016 |
| pH | daily maximum | ≤ 9 SU | all year | 016 |
| Solids, total suspended | daily average | ≤ 30 mg/L | all year | 016 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 016 |
| Solids, total suspended | daily average | report only (lb/d) | all year | 016 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 016 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 016 |
| Oil & Grease | daily maximum | ≤ 13 mg/L | all year | 016 |
| Oil & Grease | daily average | report only (lb/d) | all year | 016 |
| Oil & Grease | daily maximum | report only (lb/d) | all year | 016 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 016 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 016 |
| pH | daily minimum | ≥ 6 SU | all year | 017 |
| pH | daily maximum | ≤ 9 SU | all year | 017 |
| Solids, total suspended | daily average | ≤ 30 mg/L | all year | 017 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 017 |
| Solids, total suspended | daily average | report only (lb/d) | all year | 017 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 017 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 017 |
| Oil & Grease | daily maximum | ≤ 13 mg/L | all year | 017 |
| Oil & Grease | daily average | report only (lb/d) | all year | 017 |
| Oil & Grease | daily maximum | report only (lb/d) | all year | 017 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 017 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 017 |
| pH | daily minimum | ≥ 6 SU | all year | 035 |
| pH | daily maximum | ≤ 9 SU | all year | 035 |
| Solids, total suspended | daily average | ≤ 30 mg/L | all year | 035 |
| Solids, total suspended | daily maximum | ≤ 100 mg/L | all year | 035 |
| Solids, total suspended | daily average | report only (lb/d) | all year | 035 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 035 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 035 |
| Oil & Grease | daily maximum | ≤ 20 mg/L | all year | 035 |
| Oil & Grease | daily average | report only (lb/d) | all year | 035 |
| Oil & Grease | daily maximum | report only (lb/d) | all year | 035 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 035 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 035 |
| Solids, total suspended | daily average | ≤ 29 mg/L | all year | 101 |
| Solids, total suspended | daily maximum | ≤ 65 mg/L | all year | 101 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 101 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 101 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 5 mg/L | all year | 201 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 398 MGD | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 201 |
| Oil & Grease | daily average | ≤ 10 mg/L | all year | 301 |
| Oil & Grease | daily maximum | ≤ 15 mg/L | all year | 301 |
| Thermal Discharge | daily average | ≤ 703 BTU/hr | all year | 401 |
| Thermal Discharge | daily maximum | ≤ 995 BTU/hr | all year | 401 |
| BOD, 5-day, 20 deg. C | daily average | report only (mg/L) | all year | 401 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 401 |
| BOD, 5-day, 20 deg. C | daily average | report only (lb/d) | all year | 401 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 401 |
| Carbon, tot organic [TOC] | daily average | report only (mg/L) | all year | 401 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 23 mg/L | all year | 401 |
| Carbon, tot organic [TOC] | daily average | report only (lb/d) | all year | 401 |
| Carbon, tot organic [TOC] | daily maximum | report only (lb/d) | all year | 401 |
| Iron, total [as Fe] | daily average | report only (mg/L) | all year | 401 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 401 |
| Iron, total [as Fe] | daily average | report only (lb/d) | all year | 401 |
| Iron, total [as Fe] | daily maximum | report only (lb/d) | all year | 401 |
| Aluminum, total [as Al] | daily average | report only (mg/L) | all year | 401 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 401 |
| Aluminum, total [as Al] | daily average | report only (lb/d) | all year | 401 |
| Aluminum, total [as Al] | daily maximum | report only (lb/d) | all year | 401 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 401 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 401 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 9 MGD | all year | 501 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 501 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 25 mg/L | all year | 601 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 44 mg/L | all year | 601 |
| BOD, 5-day, 20 deg. C | daily average | ≤ 1867 lb/d | all year | 601 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 3326 lb/d | all year | 601 |
| Solids, total suspended | daily average | ≤ 29 mg/L | all year | 601 |
| Solids, total suspended | daily maximum | ≤ 43 mg/L | all year | 601 |
| Solids, total suspended | daily average | ≤ 2198 lb/d | all year | 601 |
| Solids, total suspended | daily maximum | ≤ 3218 lb/d | all year | 601 |
| Oil & Grease | daily average | ≤ 7 mg/L | all year | 601 |
| Oil & Grease | daily maximum | ≤ 13 mg/L | all year | 601 |
| Oil & Grease | daily average | ≤ 528 lb/d | all year | 601 |
| Oil & Grease | daily maximum | ≤ 994 lb/d | all year | 601 |
| Nitrogen, total [as N] | daily average | report only (mg/L) | all year | 601 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 601 |
| Nitrogen, total [as N] | daily average | report only (lb/d) | all year | 601 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | all year | 601 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 12 mg/L | all year | 601 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 mg/L | all year | 601 |
| Nitrogen, ammonia total [as N] | daily average | ≤ 864 lb/d | all year | 601 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1901 lb/d | all year | 601 |
| Nitrogen, nitrite total [as N] | daily average | report only (mg/L) | all year | 601 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | 601 |
| Nitrogen, nitrite total [as N] | daily average | report only (lb/d) | all year | 601 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (lb/d) | all year | 601 |
| Nitrogen, nitrate total [as N] | daily average | report only (mg/L) | all year | 601 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 601 |
| Nitrogen, nitrate total [as N] | daily average | report only (lb/d) | all year | 601 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (lb/d) | all year | 601 |
| Nitrogen, Kjeldahl, total [as N] | daily average | report only (mg/L) | all year | 601 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 601 |
| Nitrogen, Kjeldahl, total [as N] | daily average | report only (lb/d) | all year | 601 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/d) | all year | 601 |
| Carbon, tot organic [TOC] | daily average | ≤ 42 mg/L | all year | 601 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 75 mg/L | all year | 601 |
| Carbon, tot organic [TOC] | daily average | ≤ 3174 lb/d | all year | 601 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 5655 lb/d | all year | 601 |
| Cyanide, free-water plus wastewaters | daily average | report only (mg/L) | all year | 601 |
| Cyanide, free-water plus wastewaters | daily maximum | report only (mg/L) | all year | 601 |
| Cyanide, free-water plus wastewaters | daily average | report only (lb/d) | all year | 601 |
| Cyanide, free-water plus wastewaters | daily maximum | report only (lb/d) | all year | 601 |
| Sulfide, total [as S] | daily average | ≤ .11 mg/L | all year | 601 |
| Sulfide, total [as S] | daily maximum | ≤ .25 mg/L | all year | 601 |
| Sulfide, total [as S] | daily average | ≤ 8.4 lb/d | all year | 601 |
| Sulfide, total [as S] | daily maximum | ≤ 18.7 lb/d | all year | 601 |
| Chromium, hexavalent [as Cr] | daily average | ≤ .015 mg/L | all year | 601 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .03 mg/L | all year | 601 |
| Chromium, hexavalent [as Cr] | daily average | ≤ 1.13 lb/d | all year | 601 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 2.5 lb/d | all year | 601 |
| Chromium, total [as Cr] | daily average | ≤ .17 mg/L | all year | 601 |
| Chromium, total [as Cr] | daily maximum | ≤ .49 mg/L | all year | 601 |
| Chromium, total [as Cr] | daily average | ≤ 12.9 lb/d | all year | 601 |
| Chromium, total [as Cr] | daily maximum | ≤ 37 lb/d | all year | 601 |
| Iron, total [as Fe] | daily average | ≤ 2 mg/L | all year | 601 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | 601 |
| Iron, total [as Fe] | daily average | ≤ 218 lb/d | all year | 601 |
| Iron, total [as Fe] | daily maximum | ≤ 328 lb/d | all year | 601 |
| Vanadium, total [as V] | daily average | report only (mg/L) | all year | 601 |
| Vanadium, total [as V] | daily maximum | report only (mg/L) | all year | 601 |
| Vanadium, total [as V] | daily average | report only (lb/d) | all year | 601 |
| Vanadium, total [as V] | daily maximum | report only (lb/d) | all year | 601 |
| Selenium, total [as Se] | daily average | ≤ .02 mg/L | all year | 601 |
| Selenium, total [as Se] | daily maximum | ≤ .03 mg/L | all year | 601 |
| Selenium, total [as Se] | daily average | ≤ 2.2 lb/d | all year | 601 |
| Selenium, total [as Se] | daily maximum | ≤ 3.3 lb/d | all year | 601 |
| Flow, in conduit or thru treatment plant | daily average | ≤ 13 MGD | all year | 601 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 601 |
| Phenolic compounds, total | daily average | ≤ .15 mg/L | all year | 601 |
| Phenolic compounds, total | daily maximum | ≤ .32 mg/L | all year | 601 |
| Phenolic compounds, total | daily average | ≤ 10.9 lb/d | all year | 601 |
| Phenolic compounds, total | daily maximum | ≤ 24 lb/d | all year | 601 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | all year | 701 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 701 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | 701 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 701 |
Cited limits by parameter: Delaware's rules and the federal ones.
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