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Sewage treatment plant, major discharger, Libby, Montana. NPDES permit MT0020494 expired Jun 30, 2021; its limits still apply. Last 12 months: no values over a limit, 4 required values missing, 6 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily minimum | 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 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 117 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 192 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 123 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 192 lb/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | 30-day average | report only (lb/d) | 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, 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] | 30-day average | report only (lb/d) | all year | 001 |
| Zinc, total recoverable | quarterly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | quarterly average | report only (ug/L) | all year | 001 |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 126 CFU/100mL | Apr–Oct | 001 |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | 7-day geometric mean | ≤ 252 CFU/100mL | Apr–Oct | 001 |
| E. coli, MTEC-MF | 7-day geometric mean | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .5 mg/L | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Temperature, water deg. fahrenheit | quarterly minimum | report only (deg F) | all year | RIV |
| Temperature, water deg. fahrenheit | quarterly maximum | report only (deg F) | all year | RIV |
| pH | quarterly average | report only (SU) | all year | RIV |
| Nitrogen, ammonia total [as N] | quarterly average | report only (mg/L) | all year | RIV |
| Hardness, total [as CaCO3] | quarterly average | report only (mg/L) | all year | RIV |
| Zinc, total recoverable | quarterly maximum | report only (ug/L) | all year | RIV |
| Copper, total recoverable | quarterly minimum | report only (ug/L) | all year | RIV |
Cited limits by parameter: Montana's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MT0020494 · MCP: https://passage-data.com/mcp