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Petroleum Refining, major discharger, Billings, Montana. NPDES permit MT0000256 expired Jul 31, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (mg/L) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (lb/d) | all year | 002 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (lb/d) | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | 30-day average | report only (lb/d) | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 002 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.3 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.6 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 002 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 002 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | all year | 002 |
| Sulfide, total [as S] | 30-day average | report only (ug/L) | all year | 002 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 002 |
| Sulfide, total [as S] | value | report only (lb/d) | all year | 002 |
| Sulfide, dissolved, [as S] | 30-day average | report only (ug/L) | all year | 002 |
| Sulfide, dissolved, [as S] | daily maximum | report only (ug/L) | all year | 002 |
| Fluoride | 30-day average | report only (mg/L) | all year | 002 |
| Fluoride | daily maximum | report only (mg/L) | all year | 002 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | 30-day average | ≤ 5 ug/L | all year | 002 |
| Selenium, total recoverable | daily maximum | ≤ 10 ug/L | all year | 002 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (lb/d) | all year | 002 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (lb/d) | all year | 002 |
| Aluminum, dissolved [as Al] | 30-day average | report only (ug/L) | all year | 002 |
| Aluminum, dissolved [as Al] | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chromium, total recoverable | 30-day average | report only (lb/d) | all year | 002 |
| Chromium, total recoverable | daily maximum | report only (lb/d) | all year | 002 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Oil and grease | monthly average | report only (mg/L) | all year | 002 |
| Oil and grease | daily maximum | ≤ 10 mg/L | all year | 002 |
| Oil and grease | daily maximum | report only (lb/d) | all year | 002 |
| Phenolics, total recoverable | 30-day average | report only (ug/L) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Phenolics, total recoverable | 30-day average | report only (lb/d) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (lb/d) | all year | 002 |
| Chlorine, total residual | 30-day average | ≤ 100 ug/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 100 ug/L | all year | 002 |
| Hydrogen sulfide | 30-day average | report only (ug/L) | all year | 002 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 002 |
| Duration of discharge | value | report only (#/mo) | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly maximum | report only (mg/L) | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total suspended | weekly maximum | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | weekly maximum | ≤ 10 mg/L | all year | 003 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 003 |
| Nitrogen, total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 003 |
| Nitrogen, ammonia total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 003 |
| Nitrogen, Kjeldahl, dissolved [as N] | 30-day average | report only (mg/L) | Jul–Sep | 003 |
| Nitrogen, Kjeldahl, dissolved [as N] | daily maximum | report only (mg/L) | Jul–Sep | 003 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 003 |
| Nitrite + Nitrate total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 003 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep | 003 |
| Phosphorus, total [as P] | weekly maximum | report only (mg/L) | Jul–Sep | 003 |
| Carbon, tot organic [TOC] | weekly maximum | ≤ 110 mg/L | all year | 003 |
| Sulfide, dissolved, [as S] | 30-day average | report only (mg/L) | all year | 003 |
| Sulfide, dissolved, [as S] | weekly maximum | report only (mg/L) | all year | 003 |
| Selenium, total recoverable | 30-day average | ≤ 7.5 ug/L | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ 15 ug/L | all year | 003 |
| Arsenic, total [as As] | 30-day average | report only (ng/L) | all year | 003 |
| Arsenic, total [as As] | weekly maximum | report only (ng/L) | all year | 003 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ng/L) | all year | 003 |
| Chromium, hexavalent [as Cr] | weekly maximum | report only (ng/L) | all year | 003 |
| Chromium, total recoverable | 30-day average | report only (ng/L) | all year | 003 |
| Chromium, total recoverable | weekly maximum | report only (ng/L) | all year | 003 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 003 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Toluene | 30-day average | report only (ug/L) | all year | 003 |
| Toluene | daily maximum | report only (ug/L) | all year | 003 |
| Benzene | 30-day average | report only (ug/L) | all year | 003 |
| Benzene | daily maximum | report only (ug/L) | all year | 003 |
| Phenol | 30-day average | report only (ug/L) | all year | 003 |
| Phenol | daily maximum | report only (ug/L) | all year | 003 |
| p-Xylene | 30-day average | report only (ug/L) | all year | 003 |
| p-Xylene | daily maximum | report only (ug/L) | all year | 003 |
| Hydrogen sulfide | 30-day average | ≤ .002 mg/L | all year | 003 |
| Hydrogen sulfide | weekly maximum | ≤ .003 mg/L | all year | 003 |
| Chemical Oxygen Demand [COD] | 30-day average | report only (mg/L) | all year | 003 |
| Chemical Oxygen Demand [COD] | weekly average | report only (mg/L) | all year | 003 |
| Duration of discharge | value | report only (d) | all year | 003 |
| Oil and grease visual | value | report only (abst=0;prst=1) | all year | 003 |
| Flow rate | 30-day average | report only (MGD) | all year | 004 |
| Flow rate | daily maximum | report only (MGD) | all year | 004 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly maximum | report only (mg/L) | all year | 004 |
| pH | minimum | ≥ 6 SU | all year | 004 |
| pH | maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 004 |
| Solids, total suspended | weekly maximum | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | weekly maximum | ≤ 10 mg/L | all year | 004 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 004 |
| Nitrogen, total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 004 |
| Nitrogen, ammonia total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 004 |
| Nitrogen, Kjeldahl, dissolved [as N] | 30-day average | report only (mg/L) | Jul–Sep | 004 |
| Nitrogen, Kjeldahl, dissolved [as N] | daily maximum | report only (mg/L) | Jul–Sep | 004 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 004 |
| Nitrite + Nitrate total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 004 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep | 004 |
| Phosphorus, total [as P] | weekly maximum | report only (mg/L) | Jul–Sep | 004 |
| Carbon, tot organic [TOC] | monthly average | report only (mg/L) | all year | 004 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 110 mg/L | all year | 004 |
| Sulfide, dissolved, [as S] | 30-day average | report only (mg/L) | all year | 004 |
| Sulfide, dissolved, [as S] | weekly maximum | report only (mg/L) | all year | 004 |
| Selenium, total recoverable | 30-day average | ≤ 7.5 ug/L | all year | 004 |
| Selenium, total recoverable | daily maximum | ≤ 15 ug/L | all year | 004 |
| Arsenic, total [as As] | 30-day average | report only (ug/L) | all year | 004 |
| Arsenic, total [as As] | weekly maximum | report only (ug/L) | all year | 004 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ug/L) | all year | 004 |
| Chromium, hexavalent [as Cr] | weekly maximum | report only (ug/L) | all year | 004 |
| Chromium, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Chromium, total recoverable | weekly maximum | report only (ug/L) | all year | 004 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 004 |
| Toluene | 30-day average | report only (ug/L) | all year | 004 |
| Toluene | daily maximum | report only (ug/L) | all year | 004 |
| Benzene | 30-day average | report only (ug/L) | all year | 004 |
| Benzene | daily maximum | report only (ug/L) | all year | 004 |
| Phenol | 30-day average | report only (ug/L) | all year | 004 |
| Phenol | daily maximum | report only (ug/L) | all year | 004 |
| p-Xylene | 30-day average | report only (ug/L) | all year | 004 |
| p-Xylene | daily maximum | report only (ug/L) | all year | 004 |
| Hydrogen sulfide | 30-day average | report only (ug/L) | all year | 004 |
| Hydrogen sulfide | weekly maximum | report only (ug/L) | all year | 004 |
| Chemical Oxygen Demand [COD] | 30-day average | report only (mg/L) | all year | 004 |
| Chemical Oxygen Demand [COD] | weekly average | report only (mg/L) | all year | 004 |
| Duration of discharge | value | report only (d) | all year | 004 |
| Oil and grease visual | value | report only (abst=0;prst=1) | all year | 004 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 004 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 004 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 005 |
| BOD, 5-day, 20 deg. C | weekly maximum | report only (mg/L) | all year | 005 |
| pH | minimum | ≥ 6 SU | all year | 005 |
| pH | maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 005 |
| Solids, total suspended | weekly maximum | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | weekly maximum | ≤ 10 mg/L | all year | 005 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 005 |
| Nitrogen, total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 005 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 005 |
| Nitrogen, ammonia total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 005 |
| Nitrogen, Kjeldahl, dissolved [as N] | 30-day average | report only (mg/L) | Jul–Sep | 005 |
| Nitrogen, Kjeldahl, dissolved [as N] | daily maximum | report only (mg/L) | Jul–Sep | 005 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Jul–Sep | 005 |
| Nitrite + Nitrate total [as N] | weekly maximum | report only (mg/L) | Jul–Sep | 005 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep | 005 |
| Phosphorus, total [as P] | weekly maximum | report only (mg/L) | Jul–Sep | 005 |
| Carbon, tot organic [TOC] | weekly maximum | ≤ 110 mg/L | all year | 005 |
| Sulfide, dissolved, [as S] | 30-day average | report only (mg/L) | all year | 005 |
| Sulfide, dissolved, [as S] | weekly maximum | report only (mg/L) | all year | 005 |
| Selenium, total recoverable | 30-day average | ≤ 7.5 ug/L | all year | 005 |
| Selenium, total recoverable | daily maximum | ≤ 15 ug/L | all year | 005 |
| Arsenic, total [as As] | 30-day average | report only (ng/L) | all year | 005 |
| Arsenic, total [as As] | weekly maximum | report only (ng/L) | all year | 005 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ng/L) | all year | 005 |
| Chromium, hexavalent [as Cr] | weekly maximum | report only (ng/L) | all year | 005 |
| Chromium, total recoverable | 30-day average | report only (ng/L) | all year | 005 |
| Chromium, total recoverable | weekly maximum | report only (ng/L) | all year | 005 |
| Copper, total recoverable | 30-day average | report only (ug/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 005 |
| Toluene | 30-day average | report only (ug/L) | all year | 005 |
| Toluene | daily maximum | report only (ug/L) | all year | 005 |
| Benzene | 30-day average | report only (ug/L) | all year | 005 |
| Benzene | daily maximum | report only (ug/L) | all year | 005 |
| Phenol | 30-day average | report only (ug/L) | all year | 005 |
| Phenol | daily maximum | report only (ug/L) | all year | 005 |
| p-Xylene | 30-day average | report only (ug/L) | all year | 005 |
| p-Xylene | daily maximum | report only (ug/L) | all year | 005 |
| Hydrogen sulfide | 30-day average | ≤ .002 mg/L | all year | 005 |
| Hydrogen sulfide | weekly maximum | ≤ .003 mg/L | all year | 005 |
| Chemical Oxygen Demand [COD] | 30-day average | report only (mg/L) | all year | 005 |
| Chemical Oxygen Demand [COD] | weekly average | report only (mg/L) | all year | 005 |
| Duration of discharge | value | report only (d) | all year | 005 |
| Oil and grease visual | value | report only (abst=0;prst=1) | all year | 005 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 006 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 006 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | 006 |
| Flow rate | 30-day average | report only (MGD) | all year | 006 |
| Flow rate | daily maximum | report only (MGD) | all year | 006 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (lb/d) | all year | 006 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (lb/d) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (mg/L) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (lb/d) | all year | 006 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (lb/d) | all year | 006 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 006 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 006 |
| pH | value | report only (SU) | all year | 006 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Solids, total suspended | 30-day average | report only (lb/d) | all year | 006 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 006 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | Aug–Oct | 006 |
| Nitrogen, total [as N] | daily maximum | report only (lb/d) | Aug–Oct | 006 |
| Nitrogen, total [as N] | value | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (lb/d) | Aug–Oct | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Aug–Oct | 006 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | 006 |
| Nitrogen, Kjeldahl, dissolved [as N] | 30-day average | report only (mg/L) | Aug–Oct | 006 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | Aug–Oct | 006 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | Aug–Oct | 006 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | Aug–Oct | 006 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Aug–Oct | 006 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Aug–Oct | 006 |
| Phosphorus, total [as P] | 30-day average | report only (lb/d) | Aug–Oct | 006 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Aug–Oct | 006 |
| Phosphorus, total [as P] | value | report only (mg/L) | Aug–Oct | 006 |
| Cyanide, total [as CN] | 30-day average | report only (ug/L) | all year | 006 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 006 |
| Cyanide, total [as CN] | value | report only (ug/L) | all year | 006 |
| Sulfide, total [as S] | 30-day average | report only (ug/L) | all year | 006 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 006 |
| Sulfide, total [as S] | 30-day average | report only (lb/d) | all year | 006 |
| Sulfide, total [as S] | daily maximum | report only (lb/d) | all year | 006 |
| Sulfide, dissolved, [as S] | 30-day average | report only (ug/L) | all year | 006 |
| Sulfide, dissolved, [as S] | daily maximum | report only (ug/L) | all year | 006 |
| Sulfide, dissolved, [as S] | value | report only (ug/L) | all year | 006 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 006 |
| Fluoride | 30-day average | report only (mg/L) | all year | 006 |
| Fluoride | daily maximum | report only (mg/L) | all year | 006 |
| Arsenic, total recoverable | monthly average | ≤ 10 ug/L | all year | 006 |
| Arsenic, total recoverable | daily maximum | ≤ 10 ug/L | all year | 006 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 006 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Iron, total recoverable | value | report only (ug/L) | all year | 006 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Selenium, total recoverable | value | report only (ug/L) | all year | 006 |
| Thallium, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Thallium, total recoverable | value | report only (ug/L) | all year | 006 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ug/L) | all year | 006 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (lb/d) | all year | 006 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (lb/d) | all year | 006 |
| Chromium, hexavalent [as Cr] | value | report only (ug/L) | all year | 006 |
| Aluminum, dissolved [as Al] | monthly average | report only (ug/L) | all year | 006 |
| Aluminum, dissolved [as Al] | daily maximum | report only (ug/L) | all year | 006 |
| Aluminum, dissolved [as Al] | value | report only (ug/L) | all year | 006 |
| Cadmium, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Cadmium, total recoverable | value | report only (ug/L) | all year | 006 |
| Lead, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Lead, total recoverable | value | report only (ug/L) | all year | 006 |
| Chromium, total recoverable | 30-day average | report only (ug/L) | all year | 006 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Chromium, total recoverable | 30-day average | report only (lb/d) | all year | 006 |
| Chromium, total recoverable | daily maximum | report only (lb/d) | all year | 006 |
| Chromium, total recoverable | value | report only (mg/L) | all year | 006 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Copper, total recoverable | value | report only (ug/L) | all year | 006 |
| Oil and grease | daily maximum | ≤ 10 mg/L | all year | 006 |
| Oil and grease | daily maximum | report only (lb/d) | all year | 006 |
| Phenolics, total recoverable | 30-day average | report only (mg/L) | all year | 006 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 006 |
| Phenolics, total recoverable | 30-day average | report only (lb/d) | all year | 006 |
| Phenolics, total recoverable | daily maximum | report only (lb/d) | all year | 006 |
| Phenol | value | report only (ug/L) | all year | 006 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 006 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 006 |
| Hydrogen sulfide | 30-day average | report only (ug/L) | all year | 006 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 006 |
| Hydrogen sulfide | value | report only (ug/L) | all year | 006 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 006 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 006 |
| Mercury, total recoverable | value | report only (ug/L) | all year | 006 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 006 |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 006 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 006 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 270 lb/d | all year | SUM |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 485 lb/d | all year | SUM |
| Oxygen demand, chem. [high level] [COD] | 30-day average | ≤ 1253 lb/d | all year | SUM |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 2243 lb/d | all year | SUM |
| Solids, total suspended | 30-day average | ≤ 215 lb/d | all year | SUM |
| Solids, total suspended | daily maximum | ≤ 338 lb/d | all year | SUM |
| Oil & Grease | 30-day average | ≤ 78 lb/d | all year | SUM |
| Oil & Grease | daily maximum | ≤ 148 lb/d | all year | SUM |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 143 lb/d | all year | SUM |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 314 lb/d | all year | SUM |
| Sulfide, total [as S] | 30-day average | ≤ 1.38 lb/d | all year | SUM |
| Sulfide, total [as S] | daily maximum | ≤ 3.09 lb/d | all year | SUM |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .17 lb/d | all year | SUM |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .39 lb/d | all year | SUM |
| Chromium, total [as Cr] | 30-day average | ≤ 2.07 lb/d | all year | SUM |
| Chromium, total [as Cr] | daily maximum | ≤ 4.51 lb/d | all year | SUM |
| Phenolics, total recoverable | 30-day average | ≤ 1.08 lb/d | all year | SUM |
| Phenolics, total recoverable | daily maximum | ≤ 2.26 lb/d | all year | SUM |
Cited limits by parameter: Montana's rules and the federal ones.
Same industry: the 4 Petroleum Refining and Related Industries permits in Montana.
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Your permit document is the final word. As JSON: /api/v1/permits/MT0000256 · MCP: https://passage-data.com/mcp