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Sewage treatment plant, major discharger, Willmar, Minnesota. NPDES permit MN0025259, in force until Mar 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | Mar, Sep | D103 |
| Oxygen, dissolved [DO] | monthly minimum | ≥ 6 mg/L | Jan, Feb, Mar, Dec | D103 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | Apr–Nov | D103 |
| pH | monthly minimum | ≥ 6 SU | all year | D103 |
| pH | monthly maximum | ≤ 9 SU | all year | D103 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D103 |
| Solids, total suspended | monthly maximum | report only (mg/L) | May, Sep | D103 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D103 |
| Solids, total suspended | monthly average | ≤ 852 kg/d | all year | D103 |
| Solids, total suspended | maximum weekly average | ≤ 1277 kg/d | all year | D103 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D103 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr–Nov | D103 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Dec | D103 |
| Nitrogen, ammonia total [as N] | monthly average | report only (kg/d) | Apr–Nov | D103 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 142 kg/d | Jan, Feb, Mar, Dec | D103 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D103 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D103 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D103 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Jun–Sep | D103 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | D103 |
| Phosphorus, total [as P] | monthly average | ≤ 22.1 kg/d | Jun–Sep | D103 |
| Phosphorus, total [as P] | annual total | ≤ 8300 kg/yr | all year | D103 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Chloride [as Cl] | daily maximum | ≤ 612 mg/L | all year | D103 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | May–Oct | D103 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D103 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D103 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D103 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | Mar, Sep | D103 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | May, Sep | D103 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | May, Sep | D103 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | all year | D103 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 22.5 mg/L | all year | D103 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 426 kg/d | all year | D103 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 639 kg/d | all year | D103 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D103 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D103 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S107 |
| pH | monthly minimum | report only (SU) | all year | S107 |
| pH | monthly maximum | report only (SU) | all year | S107 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S107 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S107 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S107 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S107 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S107 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S107 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S107 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S107 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S107 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S107 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S107 |
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/MN0025259 · MCP: https://passage-data.com/mcp