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Electric Services, major discharger, Welch, Minnesota. NPDES permit MN0004006, in force until May 31, 2031. Last 12 months: no values over a limit, 18 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | maximum daily average | report only (deg F) | all year | D006 |
| Plant capacity fact. percent of capacity | monthly average | report only (%) | all year | D006 |
| pH | monthly minimum | ≥ 6 SU | all year | D006 |
| pH | monthly maximum | ≤ 9 SU | all year | D006 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Oxidants released, total residual | instantaneous maximum | ≤ .05 mg/L | all year | D006 |
| Flow, in conduit or thru treatment plant | daily average | report only (MGD) | all year | D006 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D006 |
| Chlorination | daily maximum | ≤ 2 hr/d | all year | D006 |
| Solids, total dissolved | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D013 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D013 |
| Temperature, water deg. fahrenheit | daily average | report only (deg F) | Jan, Feb, Mar, Nov, Dec | W014 |
| Temperature, water deg. fahrenheit | daily average | ≤ 86 deg F | all year | W014 |
| Temp. diff. between samp. & upstrm deg. F | maximum daily average | ≤ 5 deg F | all year | W014 |
| Temperature, water deg. fahrenheit | maximum daily average | report only (deg F) | all year | W015 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | W015 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | W015 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | W015 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | W015 |
| Temperature, water deg. fahrenheit | maximum daily average | report only (deg F) | all year | W016 |
| Temperature, water deg. fahrenheit | maximum daily average | report only (deg F) | all year | W017 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 12 Electric Services permits in Minnesota.
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