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Sewage treatment plant, Pipestone, Minnesota. NPDES permit MN0054801, in force until Feb 28, 2030. Last 12 months: over a limit 3 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | pH, monthly maximum | 9.3 | ≤ 9 SU | — |
| March 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 47 | ≤ 25 mg/L | 88% |
| March 2026 | BOD, carbonaceous [5 day, 20 C], maximum weekly average | 47 | ≤ 40 mg/L | 18% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | monthly maximum | report only (umho/cm) | all year | D001 |
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D001 |
| pH | monthly minimum | ≥ 6 SU | all year | D001 |
| pH | monthly maximum | ≤ 9 SU | all year | D001 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D001 |
| Solids, total suspended | annual maximum | report only (mg/L) | all year | D001 |
| Solids, total suspended | maximum weekly average | ≤ 65 mg/L | all year | D001 |
| Solids, total suspended | monthly average | ≤ 1042 kg/d | all year | D001 |
| Solids, total suspended | year-to-date total | ≤ 37252 kg/yr | all year | D001 |
| Solids, total suspended | maximum weekly average | ≤ 1506 kg/d | all year | D001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | D001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | May–Sep | D001 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec | D001 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | May–Sep | D001 |
| Phosphorus, total [as P] | year-to-date total | ≤ 1989 kg/yr | all year | D001 |
| Chloride [as Cl] | monthly average | ≤ 297 mg/L | all year | D001 |
| Chloride [as Cl] | daily maximum | ≤ 620 mg/L | all year | D001 |
| Sulfate, total [as SO4] | monthly maximum | report only (mg/L) | all year | D001 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Jan, Feb, Jul, Aug | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Jan, Feb, Jul, Aug | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Mar, Apr, May, Jun, Sep, Oct, Nov, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Jul, Aug | D001 |
| Solids, total dissolved | monthly maximum | report only (mg/L) | all year | D001 |
| Mercury, dissolved [as Hg] | annual maximum | report only (ng/L) | all year | D001 |
| Mercury, total [as Hg] | annual maximum | report only (ng/L) | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 580 kg/d | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | year-to-date total | ≤ 20696 kg/yr | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 927 kg/d | all year | D001 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S005 |
| pH | quarterly maximum | report only (SU) | Mar, Jun, Sep, Dec | S005 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S005 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S005 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S005 |
| BOD, carbonaceous [5 day, 20 C] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S005 |
| pH | monthly minimum | report only (SU) | all year | S006 |
| pH | monthly maximum | report only (SU) | all year | S006 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S006 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S006 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S006 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S006 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S006 |
| Phosphorus, total [as P] | monthly total | report only (kg/mo) | all year | S006 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S006 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S006 |
| pH | monthly minimum | report only (SU) | all year | S007 |
| pH | monthly maximum | report only (SU) | all year | S007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S007 |
| Solids, total suspended | monthly average | report only (kg/d) | all year | S007 |
| Solids, total suspended | monthly total | report only (kg/mo) | all year | S007 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S007 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S007 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | S007 |
| Phosphorus, total [as P] | monthly total | report only (kg/mo) | all year | S007 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S007 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (kg/d) | all year | S007 |
| BOD, carbonaceous [5 day, 20 C] | monthly total | report only (kg/mo) | all year | S007 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly minimum | report only (%) | all year | S007 |
| Solids, suspended percent removal | monthly minimum | report only (%) | all year | S007 |
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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