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Sewage treatment plant, Biwabik, Minnesota. NPDES permit MN0053279, in force until Feb 28, 2027. Last 12 months: over a limit 2 times (last June 2026), 24 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| May 2026 | pH, monthly maximum | 9.7 | ≤ 9 SU |
| June 2026 | pH, monthly maximum | 10.4 | ≤ 9 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 | report only (mg/L) | all year | D001 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | D001 |
| Solids, total suspended | daily 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 | ≤ 243.8 kg/d | all year | D001 |
| Solids, total suspended | maximum weekly average | ≤ 352.2 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) | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | May–Nov | 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) | Jan, Feb, Mar, Apr, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | May–Nov | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | Jan, Feb, Mar, Apr, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | May–Nov | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | Jan, Feb, Mar, Apr, Dec | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | May–Nov | D001 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | D001 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D001 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | all year | D001 |
| Mercury, total [as Hg] | monthly average | ≤ 1.9 ng/L | all year | D001 |
| Mercury, total [as Hg] | daily maximum | ≤ 3.4 ng/L | all year | D001 |
| Mercury, total [as Hg] | monthly average | ≤ 10.3 mg/d | all year | D001 |
| Mercury, total [as Hg] | daily maximum | ≤ 18.4 mg/d | 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 | ≤ 135.5 kg/d | all year | D001 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 216.7 kg/d | all year | D001 |
| pH | monthly minimum | report only (SU) | all year | D002 |
| pH | monthly maximum | report only (SU) | all year | D002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D002 |
| Phosphorus, total [as P] | monthly average | ≤ 5.5 kg/d | all year | D002 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D002 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S003 |
| pH | quarterly maximum | report only (SU) | Mar, Jun, Sep, Dec | S003 |
| Solids, total suspended | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S003 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Phosphorus, total [as P] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S003 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S003 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S003 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | S003 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | S003 |
| BOD, carbonaceous [5 day, 20 C] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S003 |
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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