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Sewage treatment plant, Wells, Minnesota. NPDES permit MN0025224, in force until Aug 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) | all year | D004 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D004 |
| pH | monthly minimum | ≥ 6 SU | all year | D004 |
| pH | monthly maximum | ≤ 9 SU | all year | D004 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | D004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D004 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D004 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D004 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D004 |
| Solids, total suspended | monthly average | ≤ 715.3 kg/d | all year | D004 |
| Solids, total suspended | maximum weekly average | ≤ 1033.3 kg/d | all year | D004 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D004 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D004 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D004 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D004 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D004 |
| Phosphorus, total [as P] | monthly total | report only (kg/mo) | all year | D004 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | D004 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | D004 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | D004 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | D004 |
| Chloride [as Cl] | monthly average | ≤ 476 mg/L | all year | D004 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D004 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D004 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | May–Oct | D004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Jul, Aug | D004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D004 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Jan, Feb, Jul, Aug | D004 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D004 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Jul, Aug | D004 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D004 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | D004 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D004 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | all year | D004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | D004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | D004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D004 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 397.4 kg/d | all year | D004 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 635.9 kg/d | all year | D004 |
| Specific conductance | monthly maximum | report only (umho/cm) | all year | D005 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D005 |
| pH | monthly minimum | ≥ 6 SU | all year | D005 |
| pH | monthly maximum | ≤ 9 SU | all year | D005 |
| Bicarbonate ion- [as HCO3] | monthly maximum | report only (mg/L) | all year | D005 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D005 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D005 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | D005 |
| Solids, total suspended | monthly average | ≤ 1932.5 kg/d | all year | D005 |
| Solids, total suspended | maximum weekly average | ≤ 2791.4 kg/d | all year | D005 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D005 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D005 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D005 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D005 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D005 |
| Phosphorus, total [as P] | monthly total | report only (kg/mo) | all year | D005 |
| Calcium, total [as Ca] | monthly maximum | report only (mg/L) | all year | D005 |
| Magnesium, total [as Mg] | monthly maximum | report only (mg/L) | all year | D005 |
| Sodium, total [as Na] | monthly maximum | report only (mg/L) | all year | D005 |
| Potassium, total [as K] | monthly maximum | report only (mg/L) | all year | D005 |
| Chloride [as Cl] | monthly average | ≤ 476 mg/L | all year | D005 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D005 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D005 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | May–Oct | D005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Jul, Aug | D005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D005 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Jan, Feb, Jul, Aug | D005 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D005 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Jul, Aug | D005 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D005 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | D005 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D005 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | all year | D005 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | D005 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | all year | D005 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D005 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D005 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1073.6 kg/d | all year | D005 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 1717.8 kg/d | all year | D005 |
| Phosphorus, total [as P] | year-to-date total | ≤ 1202 kg/yr | all year | D007 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S006 |
| pH | quarterly maximum | report only (SU) | Mar, Jun, Sep, Dec | S006 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S006 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S006 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S006 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | S006 |
| BOD, carbonaceous [5 day, 20 C] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S006 |
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/MN0025224 · MCP: https://passage-data.com/mcp