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Sewage treatment plant, major discharger, Lewistown, Montana. NPDES permit MT0020044 expired Aug 31, 2017; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 2 required values missing, 2 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, total suspended, weekly average | 1248 lb/d | ≤ 1035 lb/d | 21% |
| December 2025 | Solids, total suspended, weekly average | 86 mg/L | ≤ 45 mg/L | 91% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Flow rate | monthly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 552 lb/d | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 828 lb/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 690 lb/d | all year |
| Solids, total suspended | weekly average | ≤ 1035 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | weekly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | weekly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | weekly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | weekly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year |
| Cyanide, total [as CN] | value | report only (ug/L) | all year |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year |
| Arsenic, total recoverable | value | report only (ug/L) | all year |
| Selenium, total recoverable | value | report only (ug/L) | all year |
| Thallium, total recoverable | value | report only (ug/L) | all year |
| Beryllium, total recoverable [as Be] | value | report only (ug/L) | all year |
| Nickel, total recoverable | value | report only (ug/L) | all year |
| Silver total recoverable | value | report only (ug/L) | all year |
| Zinc, total recoverable | value | report only (ug/L) | all year |
| Cadmium, total recoverable | value | report only (ug/L) | all year |
| Lead, total recoverable | value | report only (ug/L) | all year |
| Chromium, total recoverable | value | report only (ug/L) | all year |
| Copper, total recoverable | value | report only (ug/L) | all year |
| Antimony, total recoverable | value | report only (ug/L) | all year |
| E. coli, MTEC-MF | monthly average | ≤ 126 CFU/100mL | Apr–Oct |
| E. coli, MTEC-MF | monthly average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, MTEC-MF | weekly average | ≤ 252 CFU/100mL | Apr–Oct |
| E. coli, MTEC-MF | weekly average | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| Phenols | value | report only (ug/L) | all year |
| Mercury, total recoverable | value | report only (ug/L) | all year |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | value | ≤ 1 N=0;Y=1 | all year |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | value | ≤ 1 N=0;Y=1 | all year |
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/MT0020044 · MCP: https://passage-data.com/mcp