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Sewage treatment plant, major discharger, Kalispell, Montana. NPDES permit MT0021938 expired Jul 31, 2020; its limits still apply. Last 12 months: over a limit 4 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | BOD, 5-day, 20 deg. C, maximum 7-day average | 23.2 mg/L | ≤ 15 mg/L | 55% |
| December 2025 | BOD, 5-day, 20 deg. C, maximum 7-day average | 635.3 lb/d | ≤ 388 lb/d | 64% |
| March 2026 | BOD, 5-day, 20 deg. C, 30-day average | 260 lb/d | ≤ 259 lb/d | 0% |
| April 2026 | BOD, 5-day, 20 deg. C, maximum 7-day average | 411.472 lb/d | ≤ 388 lb/d | 6% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Flow rate | 30-day average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year |
| Oxygen, dissolved percent saturation | daily minimum | ≥ 75 % | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 10 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 15 mg/L | all year |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 259 lb/d | all year |
| BOD, 5-day, 20 deg. C | maximum 7-day average | ≤ 388 lb/d | all year |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year |
| pH | instantaneous minimum | ≥ 6 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year |
| Solids, total suspended | maximum 7-day average | ≤ 15 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 259 lb/d | all year |
| Solids, total suspended | maximum 7-day average | ≤ 388 lb/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | maximum 7-day average | report only (mg/L) | all year |
| Nitrogen, total [as N] | 30-day average | ≤ 397 lb/d | all year |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | maximum 7-day average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | maximum 7-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul–Sep |
| Phosphorus, total [as P] | 30-day average | ≤ 25.8 lb/d | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | ≤ 9.9 lb/d | Jul–Sep |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jul–Sep |
| Copper, total recoverable | single sample | report only (ug/L) | all year |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 126 CFU/100mL | Apr–Oct |
| E. coli, MTEC-MF | 30-day geometric mean | ≤ 630 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| E. coli, MTEC-MF | daily maximum | ≤ 252 CFU/100mL | Apr–Oct |
| E. coli, MTEC-MF | daily maximum | ≤ 1260 CFU/100mL | Jan, Feb, Mar, Nov, Dec |
| Chlorine, total residual | maximum | report only (mg/L) | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year |
| Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | ≤ 0 pass=0;fail=1 | Jun, Dec |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | Jun, Dec |
Cited limits by parameter: Montana's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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