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Sewage treatment plant, Nashwauk, Minnesota. NPDES permit MN0053392 expired May 31, 2025; its limits still apply. Last 12 months: over a limit 5 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum | 73 | ≥ 85 % | 80% |
| January 2026 | Solids, suspended percent removal, monthly average minimum | 59 | ≥ 85 % | 173% |
| April 2026 | Solids, suspended percent removal, monthly average minimum | 82 | ≥ 85 % | 20% |
| August 2026 | BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum | 79.5 | ≥ 85 % | 37% |
| August 2026 | Solids, suspended percent removal, monthly average minimum | 77.5 | ≥ 85 % | 50% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | quarterly maximum | report only (umho/cm) | Mar, Jun, Sep, Dec | D002 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 5 mg/L | all year | D002 |
| pH | monthly minimum | ≥ 6 SU | all year | D002 |
| pH | monthly maximum | ≤ 9 SU | all year | D002 |
| Bicarbonate ion- [as HCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D002 |
| Solids, total suspended | monthly maximum | report only (mg/L) | Jul | D002 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D002 |
| Solids, total suspended | monthly average | ≤ 60.2 kg/d | all year | D002 |
| Solids, total suspended | maximum weekly average | ≤ 86.7 kg/d | all year | D002 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Sep | D002 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D002 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D002 |
| Phosphorus, total [as P] | annual total | ≤ 488 kg/yr | all year | D002 |
| Calcium, total [as Ca] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Magnesium, total [as Mg] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Sodium, total [as Na] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Potassium, total [as K] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Chloride [as Cl] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D002 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D002 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | Jul | D002 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | Jul | D002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D002 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 33.5 kg/d | all year | D002 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 53.5 kg/d | all year | D002 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D002 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S003 |
| pH | monthly minimum | report only (SU) | all year | S003 |
| pH | monthly maximum | report only (SU) | all year | S003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S003 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S003 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S003 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S003 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S003 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S003 |
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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