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Sewage treatment plant, Granite Falls, Minnesota. NPDES permit MN0075001, in force until Dec 12, 2027. Last 12 months: over a limit 17 times (last September 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | E. coli, daily maximum | 2419 #/100mL | ≤ 235 #/100mL | 929% |
| October 2025 | Solids, total suspended, 30-day average | 10.93 mg/L | ≤ 10 mg/L | 9% |
| October 2025 | Solids, total suspended, daily maximum | 14.94 kg/d | ≤ 8.2 kg/d | 82% |
| October 2025 | Solids, total suspended, daily maximum | 79 mg/L | ≤ 20 mg/L | 295% |
| December 2025 | Solids, total suspended, daily maximum | 29 mg/L | ≤ 20 mg/L | 45% |
| January 2026 | Solids, total suspended, daily maximum | 32 mg/L | ≤ 20 mg/L | 60% |
| February 2026 | Solids, total suspended, 30-day average | 11.42 mg/L | ≤ 10 mg/L | 14% |
| February 2026 | Solids, total suspended, daily maximum | 15.71 kg/d | ≤ 8.2 kg/d | 92% |
| February 2026 | Solids, total suspended, daily maximum | 67 mg/L | ≤ 20 mg/L | 235% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], 30-day average | 14.16 mg/L | ≤ 10 mg/L | 42% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 166 mg/L | ≤ 20 mg/L | 730% |
| April 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 28.887 kg/d | ≤ 8.2 kg/d | 252% |
| August 2026 | Phosphorus, total [as P], daily maximum | .269 kg/d | ≤ .2 kg/d | 35% |
| August 2026 | Solids, total suspended, 30-day average | 11.33 mg/L | ≤ 10 mg/L | 13% |
| August 2026 | Solids, total suspended, daily maximum | 11.137 kg/d | ≤ 8.2 kg/d | 36% |
| August 2026 | Solids, total suspended, daily maximum | 46 mg/L | ≤ 20 mg/L | 130% |
| September 2026 | BOD, carbonaceous [5 day, 20 C], daily maximum | 21.3 mg/L | ≤ 20 mg/L | 7% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 7 mg/L | all year |
| Oxygen, dissolved [DO] | minimum | ≥ 7 mg/L | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | minimum | report only (SU) | all year |
| pH | minimum | report only (SU) | all year |
| pH | maximum | report only (SU) | all year |
| pH | maximum | report only (SU) | all year |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 20 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 20 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 4.1 kg/d | all year |
| Solids, total suspended | 30-day average | ≤ 4.1 kg/d | all year |
| Solids, total suspended | daily maximum | ≤ 8.2 kg/d | all year |
| Solids, total suspended | daily maximum | ≤ 8.2 kg/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | ≤ .5 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | ≤ .5 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Sep |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May–Sep |
| Phosphorus, total [as P] | 30-day average | ≤ .2 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | ≤ .2 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | daily maximum | ≤ .2 kg/d | May–Sep |
| Phosphorus, total [as P] | daily maximum | ≤ .2 kg/d | May–Sep |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | Apr–Oct |
| E. coli | geometric mean | ≤ 126 #/100mL | Apr–Oct |
| E. coli | daily maximum | ≤ 235 #/100mL | Apr–Oct |
| E. coli | daily maximum | ≤ 235 #/100mL | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 10 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 4.1 kg/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 4.1 kg/d | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 8.2 kg/d | all year |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 8.2 kg/d | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year |
| Outfall observation,visual, y/n response | 30-day average | report only (N=0;Y=1) | all year |
| Outfall observation,visual, y/n response | 30-day average | report only (N=0;Y=1) | all year |
Cited limits by parameter: Minnesota's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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