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Petroleum Refining, major discharger, Billings, Montana. NPDES permit MT0000477 expired Jul 31, 2020; its limits still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| December 2025 | Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas, daily maximum | 1 pass=0;fail=1 | ≤ 0 pass=0;fail=1 |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Oxygen, dissolved [DO] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Oxygen, dissolved [DO] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 511 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 919 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | ≤ 3558 lb/d | all year | 001 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 6869 lb/d | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 409 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 640 lb/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 267 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 587 lb/d | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfide, total [as S] | 30-day average | report only (ug/L) | all year | 001 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 001 |
| Sulfide, total [as S] | 30-day average | ≤ 2.6 lb/d | all year | 001 |
| Sulfide, total [as S] | daily maximum | ≤ 5.8 lb/d | all year | 001 |
| Sulfide, dissolved, [as S] | monthly average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .2 lb/d | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .43 lb/d | all year | 001 |
| Chromium, total [as Cr] | 30-day average | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, total [as Cr] | 30-day average | ≤ 2.26 lb/d | all year | 001 |
| Chromium, total [as Cr] | daily maximum | ≤ 5.8 lb/d | all year | 001 |
| Phenols | 30-day average | report only (ug/L) | all year | 001 |
| Phenols | daily maximum | report only (ug/L) | all year | 001 |
| Phenols | 30-day average | ≤ 1.97 lb/d | all year | 001 |
| Phenols | daily maximum | ≤ 6.9 lb/d | all year | 001 |
| Sulfide-hydrogen sulfide [undissociated] | monthly average | report only (ug/L) | all year | 001 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 001 |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year | 001 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Oil & Grease | 30-day average | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | report only (mg/L) | all year | 002 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 5 mg/L | all year | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 002 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| Flow rate | 30-day average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| Oxygen, dissolved [DO] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 003 |
| Oxygen, dissolved [DO] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 511 lb/d | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 919 lb/d | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (mg/L) | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | ≤ 3558 lb/d | all year | 003 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 6869 lb/d | 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 | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 409 lb/d | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 640 lb/d | all year | 003 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | 30-day average | report only (mg/L) | all year | 003 |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year | 003 |
| Oil & Grease | 30-day average | ≤ 148 lb/d | all year | 003 |
| Oil & Grease | daily maximum | ≤ 279 lb/d | all year | 003 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 267 lb/d | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 587 lb/d | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfide, total [as S] | 30-day average | report only (mg/L) | all year | 003 |
| Sulfide, total [as S] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfide, total [as S] | 30-day average | ≤ 2.6 lb/d | all year | 003 |
| Sulfide, total [as S] | daily maximum | ≤ 5.8 lb/d | all year | 003 |
| Sulfide, dissolved, [as S] | monthly average | report only (ug/L) | all year | 003 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 003 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, hexavalent [as Cr] | 30-day average | report only (ug/L) | all year | 003 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .2 lb/d | all year | 003 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .43 lb/d | all year | 003 |
| Chromium, total [as Cr] | 30-day average | report only (ug/L) | all year | 003 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 003 |
| Chromium, total [as Cr] | 30-day average | ≤ 2.26 lb/d | all year | 003 |
| Chromium, total [as Cr] | daily maximum | ≤ 6.52 lb/d | all year | 003 |
| Phenols | 30-day average | report only (mg/L) | all year | 003 |
| Phenols | daily maximum | report only (mg/L) | all year | 003 |
| Phenols | 30-day average | ≤ 1.97 lb/d | all year | 003 |
| Phenols | daily maximum | ≤ 6.9 lb/d | all year | 003 |
| Sulfide-hydrogen sulfide [undissociated] | monthly average | report only (ug/L) | all year | 003 |
| Volatile Organic Compound [VOC] | 30-day average | report only (ug/L) | all year | 003 |
| Volatile Organic Compound [VOC] | daily maximum | report only (ug/L) | all year | 003 |
| Base neutrals & acid [Method 625], efflnt | 30-day average | report only (ug/L) | all year | 003 |
| Base neutrals & acid [Method 625], efflnt | daily maximum | report only (ug/L) | all year | 003 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 003 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Flow rate | 30-day average | report only (MGD) | all year | 004 |
| Flow rate | daily maximum | report only (MGD) | all year | 004 |
| Oxygen, dissolved [DO] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 004 |
| Oxygen, dissolved [DO] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | 004 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 511 lb/d | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 919 lb/d | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | report only (mg/L) | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | report only (mg/L) | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | 30-day average | ≤ 3558 lb/d | all year | 004 |
| Oxygen demand, chem. [high level] [COD] | daily maximum | ≤ 6869 lb/d | 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 | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 409 lb/d | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 640 lb/d | all year | 004 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 004 |
| Oil and grease, hexane extr method | monthly average | ≤ 148 lb/d | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 279 lb/d | all year | 004 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 267 lb/d | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 587 lb/d | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Sulfide, total [as S] | 30-day average | report only (ug/L) | all year | 004 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 004 |
| Sulfide, total [as S] | 30-day average | ≤ 2.6 lb/d | all year | 004 |
| Sulfide, total [as S] | daily maximum | ≤ 5.8 lb/d | all year | 004 |
| Sulfide, dissolved, [as S] | monthly average | report only (ug/L) | all year | 004 |
| Arsenic, total recoverable | 30-day average | report only (ug/L) | all year | 004 |
| Arsenic, total recoverable | daily 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] | daily maximum | report only (ug/L) | all year | 004 |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .2 lb/d | all year | 004 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .43 lb/d | all year | 004 |
| Chromium, total [as Cr] | 30-day average | report only (ug/L) | all year | 004 |
| Chromium, total [as Cr] | daily maximum | report only (ug/L) | all year | 004 |
| Chromium, total [as Cr] | 30-day average | ≤ 2.26 lb/d | all year | 004 |
| Chromium, total [as Cr] | daily maximum | ≤ 6.52 lb/d | all year | 004 |
| Phenols | 30-day average | report only (ug/L) | all year | 004 |
| Phenols | daily maximum | report only (ug/L) | all year | 004 |
| Phenols | 30-day average | ≤ 1.97 lb/d | all year | 004 |
| Phenols | daily maximum | ≤ 6.9 lb/d | all year | 004 |
| Sulfide-hydrogen sulfide [undissociated] | monthly average | report only (ug/L) | all year | 004 |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year | 004 |
| Report due [yrmoda] | value | ≤ 1 abst=0;prst=1 | all year | 004 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year | 004 |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year | 004 |
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/MT0000477 · MCP: https://passage-data.com/mcp