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Sewage treatment plant, Roundup, Montana. NPDES permit MT0030295 expired Oct 31, 2018; its limits still apply. Last 12 months: over a limit 4 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | pH, maximum | 9.02 SU | ≤ 9 SU | — |
| April 2026 | Solids, total suspended, 30-day average | 63 mg/L | ≤ 45 mg/L | 40% |
| May 2026 | Solids, total suspended, 30-day average | 57 mg/L | ≤ 45 mg/L | 27% |
| May 2026 | pH, maximum | 9.71 SU | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | 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 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 65 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 120.1 lb/d | all year | 001 |
| Solids, total suspended | maximum 7-day average | ≤ 173.5 lb/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | value | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | single sample | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | single sample | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.4 mg/L | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | single sample | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | ≤ 26.1 mg/L | all year | 001 |
| Phosphorus, total [as P] | single sample | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | single sample | report only (lb/d) | all year | 001 |
| Lead, total recoverable | value | report only (mg/L) | all year | 001 |
| Chromium, total recoverable | value | report only (mg/L) | all year | 001 |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 126 CFU/100mL | Apr–Oct | 001 |
| E. coli, MTEC-MF | daily maximum | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 001 |
| E. coli, MTEC-MF | daily maximum | ≤ 252 CFU/100mL | Apr–Oct | 001 |
| Mercury, total recoverable | value | report only (mg/L) | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | 30-day average | ≤ 25 mL/L | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | maximum 7-day average | ≤ 40 mL/L | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | 30-day average | ≤ 66.7 lb/d | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | maximum 7-day average | ≤ 106.8 lb/d | all year | 001 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | value | report only (mg/L) | all year | 001 |
| BOD, carbonaceous, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Oxygen, dissolved [DO] | single sample | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 65 mg/L | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 120.1 lb/d | all year | 002 |
| Solids, total suspended | maximum 7-day average | ≤ 173.4 lb/d | all year | 002 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | value | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | single sample | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | single sample | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | single sample | report only (mg/L) | all year | 002 |
| E. coli, MTEC-MF | 30-day average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 002 |
| E. coli, MTEC-MF | 30-day average | ≤ 126 CFU/100mL | Apr–Oct | 002 |
| E. coli, MTEC-MF | daily maximum | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec | 002 |
| E. coli, MTEC-MF | daily maximum | ≤ 252 CFU/100mL | Apr–Oct | 002 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | 30-day average | ≤ 25 mg/L | all year | 002 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | maximum 7-day average | ≤ 40 mg/L | all year | 002 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | 30-day average | ≤ 66.7 lb/d | all year | 002 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | maximum 7-day average | ≤ 106.8 lb/d | all year | 002 |
| Carbonaceous BOD, 5 day, 20 deg C filtrd | value | report only (mg/L) | all year | 002 |
| BOD, carbonaceous, percent removal | minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | minimum | ≥ 65 % | all year | 002 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | MW1 |
| Specific conductance | value | report only (uS/cm) | all year | MW1 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | MW1 |
| pH | value | report only (SU) | all year | MW1 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | MW1 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW1 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | MW1 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | MW1 |
| Chloride [as Cl] | value | report only (mg/L) | all year | MW1 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW1 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | MW2 |
| Specific conductance | value | report only (uS/cm) | all year | MW2 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | MW2 |
| pH | value | report only (SU) | all year | MW2 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | MW2 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW2 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | MW2 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | MW2 |
| Chloride [as Cl] | value | report only (mg/L) | all year | MW2 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW2 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | MW3 |
| Specific conductance | value | report only (uS/cm) | all year | MW3 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | MW3 |
| pH | value | report only (SU) | all year | MW3 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | MW3 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW3 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | MW3 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | MW3 |
| Chloride [as Cl] | value | report only (mg/L) | all year | MW3 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW3 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | MW4 |
| Specific conductance | value | report only (uS/cm) | all year | MW4 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | MW4 |
| pH | value | report only (SU) | all year | MW4 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | MW4 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW4 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | MW4 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | MW4 |
| Chloride [as Cl] | value | report only (mg/L) | all year | MW4 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW4 |
| Temperature, water deg. centigrade | value | report only (deg C) | all year | MW5 |
| Specific conductance | value | report only (uS/cm) | all year | MW5 |
| Oxygen, dissolved [DO] | value | report only (mg/L) | all year | MW5 |
| pH | value | report only (SU) | all year | MW5 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | MW5 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW5 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | MW5 |
| Phosphorus, total [as P] | value | report only (mg/L) | all year | MW5 |
| Chloride [as Cl] | value | report only (mg/L) | all year | MW5 |
| Depth to water level ft below landsurface | value | report only (ft) | all year | MW5 |
Cited limits by parameter: Montana's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MT0030295 · MCP: https://passage-data.com/mcp