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Sewage treatment plant, Absarokee, Montana. NPDES permit MT0021750 expired Jan 31, 2022; its limits still apply. Last 12 months: no values over a limit, 4 of 56 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | maximum | report only (deg F) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Oxygen, dissolved [DO] | single sample | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 75 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 131 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 65 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 131 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 190 lb/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.9 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.2 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jul–Sep | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| E. coli, MTEC-MF | 30-day average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | 30-day average | ≤ 126 CFU/100mL | Apr–Oct | 001 |
| E. coli, MTEC-MF | 7-day average | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | 7-day average | ≤ 252 CFU/100mL | Apr–Oct | 001 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 001 |
| Temperature, water deg. fahrenheit | maximum | report only (deg F) | all year | 01A |
| Flow rate | 30-day average | report only (MGD) | all year | 01A |
| Oxygen, dissolved [DO] | single sample | report only (mg/L) | all year | 01A |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 01A |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 01A |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 75 lb/d | all year | 01A |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 131 lb/d | all year | 01A |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 01A |
| pH | instantaneous minimum | ≥ 6 SU | all year | 01A |
| pH | instantaneous maximum | ≤ 9 SU | all year | 01A |
| Solids, total suspended | 30-day average | ≤ 45 mg/L | all year | 01A |
| Solids, total suspended | 7-day average | ≤ 65 mg/L | all year | 01A |
| Solids, total suspended | 30-day average | ≤ 131 lb/d | all year | 01A |
| Solids, total suspended | 7-day average | ≤ 190 lb/d | all year | 01A |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 01A |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 01A |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 01A |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 01A |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 mg/L | all year | 01A |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 16.1 mg/L | all year | 01A |
| Nitrogen, Kjeldahl, dissolved [as N] | monthly average | report only (mg/L) | Jul–Sep | 01A |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 01A |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep | 01A |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jul–Sep | 01A |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 01A |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 01A |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 01A |
| E. coli, MTEC-MF | 30-day average | ≤ 126 CFU/100mL | Apr–Oct | 01A |
| E. coli, MTEC-MF | 30-day average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 01A |
| E. coli, MTEC-MF | 7-day average | ≤ 252 CFU/100mL | Apr–Oct | 01A |
| E. coli, MTEC-MF | 7-day average | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 01A |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 01A |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 01A |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 01A |
| Temperature, water deg. fahrenheit | single grab sample | report only (deg F) | all year | DIT |
| Flow rate | monthly average | report only (MGD) | all year | DIT |
| Flow rate | daily maximum | report only (MGD) | all year | DIT |
| pH | single grab sample | report only (SU) | all year | DIT |
| Nitrogen, total [as N] | single grab sample | report only (mg/L) | Jul–Sep | DIT |
| Nitrogen, ammonia total [as N] | single grab sample | report only (mg/L) | all year | DIT |
| Phosphorus, total [as P] | single grab sample | report only (mg/L) | Jul–Sep | DIT |
| Temperature, water deg. fahrenheit | single grab sample | report only (deg F) | all year | ROSC |
| pH | single grab sample | report only (SU) | all year | ROSC |
| Nitrogen, total [as N] | single grab sample | report only (mg/L) | Jul–Sep | ROSC |
| Nitrogen, ammonia total [as N] | single grab sample | report only (mg/L) | all year | ROSC |
| Phosphorus, total [as P] | single grab sample | report only (mg/L) | Jul–Sep | ROSC |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | ROSC |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | ROSC |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | ROSC |
| Copper, total recoverable | single grab sample | report only (ug/L) | all year | ROSC |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | ROSC |
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/MT0021750 · MCP: https://passage-data.com/mcp