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Sewage treatment plant, Philipsburg, Montana. NPDES permit MT0031500 expired Sep 30, 2020; its limits still apply. Last 12 months: no values over a limit, 7 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | monthly maximum | report only (deg C) | all year |
| Temperature, water deg. centigrade | single sample | report only (deg C) | all year |
| Flow rate | weekly average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 40 lb/d | all year |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 60 lb/d | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| pH | minimum | ≥ 6 SU (alert, not enforceable) | all year |
| pH | maximum | ≤ 9 SU (alert, not enforceable) | all year |
| pH | single sample | report only (SU) | all year |
| Solids, total suspended | minimum weekly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year |
| Solids, total suspended | weekly maximum | ≤ 65 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 60 lb/d | all year |
| Solids, total suspended | weekly maximum | ≤ 87 lb/d | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Nitrogen, total [as N] | monthly average | ≤ 15.6 lb/d | Jul–Sep |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Nitrogen, total [as N] | single sample | report only (mg/L) | Jul–Sep |
| Nitrogen, ammonia total [as N] | monthly maximum | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | single sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | single sample | report only (mg/L) | Jul–Sep |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | single sample | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Phosphorus, total [as P] | monthly average | ≤ 3.88 lb/d | Jul–Sep |
| Phosphorus, total [as P] | single sample | report only (mg/L) | Jul–Sep |
| Hardness, total [as CaCO3] | single sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year |
| Arsenic, total recoverable | single sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Arsenic, total recoverable | single sample | report only (ug/L) | all year |
| Lead, total recoverable | monthly average | report only (ug/L) | all year |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year |
| Lead, total recoverable | single sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Lead, total recoverable | single sample | report only (ug/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 sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total recoverable | single sample | report only (ug/L) | all year |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 126 CFU/100mL | Apr–Oct |
| E. coli, colony forming units [CFU] | monthly geometric mean | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, colony forming units [CFU] | weekly maximum | ≤ 252 CFU/100mL | Apr–Oct |
| E. coli, colony forming units [CFU] | weekly maximum | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year |
| Mercury, total recoverable | single sample | report only (mg/L) | Mar, Jun, Sep, Dec |
| Mercury, total recoverable | single sample | report only (ug/L) | all year |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 65 % | 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/MT0031500 · MCP: https://passage-data.com/mcp