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Sewerage Systems, Sauk Rapids, Minnesota. NPDES permit MN0066109, in force until Sep 30, 2031. Last 12 months: over a limit 11 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum | 80 | ≥ 85 % | 33% |
| October 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 47.5 | ≤ 25 mg/L | 90% |
| October 2025 | BOD, carbonaceous [5 day, 20 C], maximum weekly average | 58 | ≤ 40 mg/L | 45% |
| October 2025 | pH, monthly minimum | 5.2 | ≥ 6 SU | — |
| November 2025 | Phosphorus, total [as P], monthly average | 1.1 | ≤ 1 mg/L | 10% |
| December 2025 | BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum | 82 | ≥ 85 % | 20% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], monthly average | 39 | ≤ 25 mg/L | 56% |
| December 2025 | BOD, carbonaceous [5 day, 20 C], maximum weekly average | 49 | ≤ 40 mg/L | 23% |
| January 2026 | Solids, suspended percent removal, monthly average minimum | 65 | ≥ 85 % | 133% |
| May 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 26.5 | ≤ 25 mg/L | 6% |
| August 2026 | pH, monthly minimum | 1 | ≥ 6 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | D001 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D001 |
| pH | monthly minimum | ≥ 6 SU | all year | D001 |
| pH | monthly maximum | ≤ 9 SU | all year | D001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D001 |
| Solids, total suspended | monthly average | ≤ 1.8 kg/d | all year | D001 |
| Solids, total suspended | maximum weekly average | ≤ 2.7 kg/d | all year | D001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Mar, Sep | D001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D001 |
| Phosphorus, total [as P] | monthly average | ≤ .19 kg/d | all year | D001 |
| Chloride [as Cl] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D001 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D001 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D001 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1.5 kg/d | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 2.4 kg/d | all year | D001 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D001 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S002 |
| pH | monthly minimum | report only (SU) | all year | S002 |
| pH | monthly maximum | report only (SU) | all year | S002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S002 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Mar, Sep | S002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Mar, Sep | S002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Mar, Sep | S002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S002 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S002 |
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/MN0066109 · MCP: https://passage-data.com/mcp