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Sewage treatment plant, Balaton, Minnesota. NPDES permit MN0020559, in force until Nov 30, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D004 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D004 |
| Solids, total suspended | monthly average | ≤ 139 kg/d | all year | D004 |
| Solids, total suspended | maximum weekly average | ≤ 200 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] | year-to-date total | ≤ 340 kg/yr | all year | D004 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | 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 average | 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 maximum | report only (MGD) | 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 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Jul, Aug | D004 |
| Solids, total dissolved | monthly average | report only (mg/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 | ≤ 77 kg/d | all year | D004 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 123 kg/d | all year | D004 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S008 |
| pH | quarterly maximum | report only (SU) | Mar, Jun, Sep, Dec | S008 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S008 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S008 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S008 |
| BOD, carbonaceous [5 day, 20 C] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S008 |
| Coliform, fecal MPN + membrane ftl 44.5 C | weekly geometric mean | report only (#/100mL) | Apr–Oct | W005 |
| Coliform, fecal MPN + membrane ftl 44.5 C | instantaneous maximum | report only (#/100mL) | Apr–Oct | W005 |
| Coliform, fecal MPN + membrane ftl 44.5 C | weekly geometric mean | report only (#/100mL) | Apr–Oct | W006 |
| Coliform, fecal MPN + membrane ftl 44.5 C | instantaneous maximum | report only (#/100mL) | Apr–Oct | W006 |
| Coliform, fecal MPN + membrane ftl 44.5 C | weekly geometric mean | report only (#/100mL) | Apr–Oct | W007 |
| Coliform, fecal MPN + membrane ftl 44.5 C | instantaneous maximum | report only (#/100mL) | Apr–Oct | W007 |
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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