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Sewage treatment plant, major discharger, New Prague, Minnesota. NPDES permit MN0020150 expired Nov 30, 2016; its limits still apply. Last 12 months: over a limit 3 times (last April 2026), 61 required values missing, 7 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| November 2025 | pH, monthly maximum | 9 | < 9 SU |
| April 2026 | Mercury, total [as Hg], daily maximum | > .5 | ≤ 17 ng/L |
| April 2026 | Mercury, total [as Hg], monthly average | > .5 | ≤ 10 ng/L |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | all year | 010 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 7 mg/L | all year | 010 |
| pH | monthly minimum | > 6 SU | all year | 010 |
| pH | monthly maximum | < 9 SU | all year | 010 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | 010 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 010 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 010 |
| Solids, total suspended | monthly average | ≤ 208 kg/d | all year | 010 |
| Solids, total suspended | maximum weekly average | ≤ 311 kg/d | all year | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.7 mg/L | Jan, Feb, Mar, Dec | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Apr, May | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Oct, Nov | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jun–Sep | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 53.3 kg/d | Jan, Feb, Mar, Dec | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 9 kg/d | Apr, May | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13.14 kg/d | Oct, Nov | 010 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.9 kg/d | Jun–Sep | 010 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Apr, Sep | 010 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Apr, Sep | 010 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 010 |
| Phosphorus, total [as P] | monthly total | report only (kg/mo) | all year | 010 |
| Phosphorus, total [as P] | year-to-date total | ≤ 1523 kg/yr | all year | 010 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | 010 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | 010 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | 010 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | 010 |
| Chloride [as Cl] | monthly maximum | report only (mg/L) | all year | 010 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | 010 |
| Silver, total [as Ag] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 010 |
| Antimony, total [as Sb] | quarterly maximum | report only (ug/L) | Mar, Jun, Sep, Dec | 010 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | 010 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | 010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | 010 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 010 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 010 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | 010 |
| Mercury, total [as Hg] | monthly average | ≤ 10 ng/L | all year | 010 |
| Mercury, total [as Hg] | daily maximum | ≤ 17 ng/L | all year | 010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 5 mg/L | all year | 010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 7.5 mg/L | all year | 010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 34.6 kg/d | all year | 010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 51.9 kg/d | all year | 010 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | 010 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 010 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | 901 |
| pH | monthly minimum | report only (SU) | all year | 901 |
| pH | monthly maximum | report only (SU) | all year | 901 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 901 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 901 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 901 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | 901 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | 901 |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | Mar, Jun, Sep, Dec | 901 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 901 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | 901 |
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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