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Sewage treatment plant, Grand Marais, Minnesota. NPDES permit MN0020010, in force until Oct 31, 2029. Last 12 months: over a limit 5 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | pH, monthly minimum | 5.7 | ≥ 6 SU | — |
| March 2026 | pH, monthly minimum | 5.2 | ≥ 6 SU | — |
| April 2026 | Solids, suspended percent removal, monthly average minimum | 77 | ≥ 85 % | 53% |
| May 2026 | Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean | 744 | ≤ 200 #/100mL | 272% |
| May 2026 | Solids, total suspended, maximum weekly average | 329.1 | ≤ 168.4 kg/d | 95% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D010 |
| pH | monthly minimum | ≥ 6 SU | all year | D010 |
| pH | monthly maximum | ≤ 9 SU | all year | D010 |
| Solids, total suspended | monthly average | report only (mg/L) | May, Sep | D010 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D010 |
| Solids, total suspended | daily maximum | report only (mg/L) | May, Sep | D010 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D010 |
| Solids, total suspended | monthly average | ≤ 112.3 kg/d | all year | D010 |
| Solids, total suspended | year-to-date total | ≤ 17144 kg/yr | all year | D010 |
| Solids, total suspended | maximum weekly average | ≤ 168.4 kg/d | all year | D010 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D010 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Mar, Sep | D010 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D010 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | D010 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D010 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D010 |
| Phosphorus, total [as P] | annual total | ≤ 522 kg/yr | all year | D010 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | all year | D010 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D010 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D010 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D010 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D010 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | May, Sep | D010 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | May, Sep | D010 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | May, Sep | D010 |
| Mercury, total [as Hg] | daily maximum | ≤ 6.1 ng/L | May, Sep | D010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 93.6 kg/d | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | year-to-date total | ≤ 14168 kg/yr | all year | D010 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 149.7 kg/d | all year | D010 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D010 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D010 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S011 |
| pH | monthly minimum | report only (SU) | all year | S011 |
| pH | monthly maximum | report only (SU) | all year | S011 |
| Solids, total suspended | monthly average | report only (mg/L) | May, Sep | S011 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S011 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S011 |
| Nitrogen, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Nitrogen, Kjeldahl, total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Nitrite + Nitrate total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | S011 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S011 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S011 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S011 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | May, Sep | S011 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | May, Sep | S011 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S011 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S011 |
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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