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Sewage treatment plant, major discharger, Livingston, Montana. NPDES permit MT0020435 expired Oct 31, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | value | 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 | 30-day average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 450 lb/d | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 751 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 maximum | report only (mg/L) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| pH | single grab sample | report only (SU) | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 45 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 450 lb/d | all year |
| Solids, total suspended | maximum 7-day average | ≤ 751 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | maximum 7-day average | report only (mg/L) | all year |
| Oil and grease, hexane extr method | monthly maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Aug–Oct |
| Nitrogen, total [as N] | weekly maximum | report only (mg/L) | Aug–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Aug–Oct |
| Nitrogen, total [as N] | single grab sample | report only (mg/L) | Aug–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.2 mg/L | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.5 mg/L | all year |
| Nitrogen, ammonia total [as N] | single grab sample | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Aug–Oct |
| Nitrogen, Kjeldahl, total [as N] | weekly maximum | report only (mg/L) | Aug–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Aug–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec |
| Nitrite + Nitrate total [as N] | weekly maximum | report only (mg/L) | Aug–Oct |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec |
| Phosphorus, total [as P] | single grab sample | report only (mg/L) | Aug–Oct |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Aug–Oct |
| Phosphorus, total [as P] | weekly maximum | report only (mg/L) | Aug–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Aug–Oct |
| Hardness, total [as CaCO3] | single grab sample | report only (mg/L) | all year |
| Copper, total recoverable | monthly average | report only (ug/L) | all year |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year |
| Copper, total recoverable | single grab sample | report only (ug/L) | all year |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 630 #/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, MTEC-MF | maximum 7-day average | ≤ 252 #/100mL | Apr–Oct |
| E. coli, MTEC-MF | maximum 7-day average | ≤ 1260 #/100mL | Jan, Feb, Mar, Nov, Dec |
| Chlorine, total residual | 30-day average | ≤ 100 ug/L | all year |
| Chlorine, total residual | daily maximum | ≤ 136 ug/L | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| Oil and grease visual | value | report only (N=0;Y=1) | all year |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | all year |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=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/MT0020435 · MCP: https://passage-data.com/mcp