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Sewage treatment plant, Prior Lake, Minnesota. NPDES permit MN0067938 expired Apr 19, 2023; its limits still apply. Last 12 months: over a limit 6 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Phosphorus, total [as P], 30-day average | 1.26 mg/L | ≤ .63 mg/L | 100% |
| December 2025 | Phosphorus, total [as P], daily maximum | 1.91 mg/L | ≤ 1.3 mg/L | 47% |
| December 2025 | Phosphorus, total [as P], daily maximum | 9.48 kg/d | ≤ 7.2 kg/d | 32% |
| January 2026 | Phosphorus, total [as P], daily maximum | 1.78 mg/L | ≤ 1.3 mg/L | 37% |
| February 2026 | BOD, carb-5 day, 20 deg C, percent removal, monthly minimum | 78.63 % | ≥ 85 % | 42% |
| February 2026 | Solids, suspended percent removal, monthly minimum | 76.56 % | ≥ 85 % | 56% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | 30-day average | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| pH | daily minimum | report only (SU) | all year | 001 |
| pH | daily maximum | report only (SU) | all year | 001 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 19 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 29 mg/L | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 109 kg/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 163 kg/d | all year | 001 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | 30-day average | ≤ .63 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 1.3 mg/L | all year | 001 |
| Phosphorus, total [as P] | 30-day average | ≤ 3.6 kg/d | all year | 001 |
| Phosphorus, total [as P] | daily maximum | ≤ 7.2 kg/d | all year | 001 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 001 |
| Calcium, total [as Ca] | 30-day average | report only (mg/L) | all year | 001 |
| Magnesium, total [as Mg] | 30-day average | report only (mg/L) | all year | 001 |
| Sodium, total [as Na] | 30-day average | report only (mg/L) | all year | 001 |
| Potassium, total [as K] | 30-day average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | 30-day average | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 001 |
| E. coli | 7-day geometric mean | ≤ 235 #/100mL | Apr–Oct | 001 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | 30-day average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 16 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 26 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 91 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 145 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly minimum | ≥ 85 % | all year | 001 |
| Outfall observation,visual, y/n response | 30-day average | report only (N=0;Y=1) | all year | 001 |
| Specific conductance | 30-day average | report only (umho/cm) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (SU) | all year | 002 |
| Bicarbonate ion- [as HCO3] | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 002 |
| Solids, total suspended | 7-day average | report only (mg/L) | all year | 002 |
| Solids, total suspended | 30-day average | report only (kg/d) | all year | 002 |
| Solids, total suspended | 7-day average | report only (kg/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | 30-day average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 30-day average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | 30-day average | report only (kg/d) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (kg/d) | all year | 002 |
| Hardness, total [as CaCO3] | 30-day average | report only (mg/L) | all year | 002 |
| Calcium, total [as Ca] | 30-day average | report only (mg/L) | all year | 002 |
| Magnesium, total [as Mg] | 30-day average | report only (mg/L) | all year | 002 |
| Sodium, total [as Na] | 30-day average | report only (mg/L) | all year | 002 |
| Potassium, total [as K] | 30-day average | report only (mg/L) | all year | 002 |
| Chloride [as Cl] | 30-day average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | 30-day average | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| E. coli | 30-day geometric mean | report only (#/100mL) | Apr–Oct | 002 |
| E. coli | daily geometric mean | report only (#/100mL) | Apr–Oct | 002 |
| Solids, total dissolved | 30-day average | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | 30-day average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | report only (kg/d) | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (kg/d) | all year | 002 |
| Outfall observation,visual, y/n response | 30-day average | report only (N=0;Y=1) | all year | 002 |
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/MN0067938 · MCP: https://passage-data.com/mcp