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Sewage treatment plant, Redwood Falls, Minnesota. NPDES permit MN0061433 expired Oct 24, 2024; its limits still apply. Last 12 months: over a limit 8 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | E. coli, daily maximum | 488 #/100mL | ≤ 410 #/100mL | 19% |
| July 2026 | Phosphorus, total [as P], 30-day average | .81 mg/L | ≤ .8 mg/L | 1% |
| August 2026 | Copper, total [as Cu], monthly average | 24.5 ug/L | ≤ 23 ug/L | 7% |
| August 2026 | E. coli, daily maximum | > 2419.8 #/100mL | ≤ 410 #/100mL | — |
| August 2026 | Phosphorus, total [as P], 30-day average | 1.46 mg/L | ≤ .8 mg/L | 83% |
| September 2026 | Copper, total [as Cu], monthly average | 26 ug/L | ≤ 23 ug/L | 13% |
| September 2026 | E. coli, daily maximum | 649 #/100mL | ≤ 410 #/100mL | 58% |
| September 2026 | Phosphorus, total [as P], 30-day average | .95 mg/L | ≤ .8 mg/L | 19% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Specific conductance | maximum | report only (umho/cm) | all year |
| Specific conductance | maximum | report only (umho/cm) | all year |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year |
| pH | daily minimum | ≥ 6 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | minimum | report only (SU) | all year |
| pH | maximum | report only (SU) | all year |
| Bicarbonate ion- [as HCO3] | maximum | report only (mg/L) | all year |
| Bicarbonate ion- [as HCO3] | maximum | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | ≤ 14.2 mg/L | all year |
| Solids, total suspended | 7-day average | ≤ 21.3 mg/L | all year |
| Solids, total suspended | 30-day average | ≤ 20.2 kg/d | all year |
| Solids, total suspended | 7-day average | ≤ 30.2 kg/d | all year |
| Solids, total suspended | 30-day average | report only (mg/L) | all year |
| Solids, total suspended | 30-day average | report only (kg/d) | all year |
| Oil & Grease | maximum | report only (mg/L) | all year |
| Oil & Grease | maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | maximum | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.1 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.4 kg/d | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.8 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 kg/d | May–Sep |
| Nitrogen, Kjeldahl, total [as N] | maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | maximum | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | maximum | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | 30-day average | ≤ .8 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | ≤ .8 mg/L | May–Sep |
| Phosphorus, total [as P] | daily maximum | ≤ 1.6 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | ≤ 1.1 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | report only (kg/d) | May–Sep |
| Phosphorus, total [as P] | daily maximum | ≤ 2.3 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | maximum | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | maximum | report only (mg/L) | all year |
| Calcium, total [as Ca] | maximum | report only (mg/L) | all year |
| Calcium, total [as Ca] | maximum | report only (mg/L) | all year |
| Magnesium, total [as Mg] | maximum | report only (mg/L) | all year |
| Magnesium, total [as Mg] | maximum | report only (mg/L) | all year |
| Sodium, total [as Na] | maximum | report only (mg/L) | all year |
| Sodium, total [as Na] | maximum | report only (mg/L) | all year |
| Potassium, total [as K] | maximum | report only (mg/L) | all year |
| Potassium, total [as K] | maximum | report only (mg/L) | all year |
| Chloride [as Cl] | maximum | report only (mg/L) | all year |
| Chloride [as Cl] | maximum | report only (mg/L) | all year |
| Chloride [as Cl] | daily maximum | ≤ 860 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 1219 kg/d | all year |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year |
| Sulfate, total [as SO4] | maximum | report only (mg/L) | all year |
| Sulfate, total [as SO4] | maximum | report only (mg/L) | all year |
| Copper, total [as Cu] | monthly average | ≤ 23 ug/L | all year |
| Copper, total [as Cu] | daily maximum | ≤ 63 ug/L | all year |
| Copper, total [as Cu] | monthly average | ≤ .033 kg/d | all year |
| Copper, total [as Cu] | daily maximum | ≤ .089 kg/d | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Chlorine, total residual | maximum | ≤ .038 mg/L | all year |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct |
| E. coli | daily maximum | ≤ 410 #/100mL | Apr–Oct |
| Solids, total dissolved | maximum | report only (mg/L) | all year |
| Solids, total dissolved | maximum | report only (mg/L) | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 5 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 10 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 15 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 7.1 kg/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 14 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 14 kg/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 21 kg/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| 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 (kg/d) | all year |
| Outfall observation,visual, y/n response | monthly 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
Your permit document is the final word. As JSON: /api/v1/permits/MN0061433 · MCP: https://passage-data.com/mcp