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Sewage treatment plant, major discharger, Ely, Minnesota. NPDES permit MN0020508, in force until May 31, 2031. Last 12 months: over a limit 2 times (last June 2026), 3 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| June 2026 | Solids, suspended percent removal, monthly average minimum | 0 | ≥ 85 % | 567% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly minimum | report only (mg/L) | all year | D050 |
| pH | monthly minimum | ≥ 6 SU | all year | D050 |
| pH | monthly maximum | ≤ 9 SU | all year | D050 |
| Solids, total suspended | monthly average | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | D050 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D050 |
| Solids, total suspended | daily maximum | report only (mg/L) | Jan, Mar, May, Jul, Sep, Nov | D050 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | D050 |
| Solids, total suspended | monthly average | ≤ 170.3 kg/d | all year | D050 |
| Solids, total suspended | maximum weekly average | ≤ 255.5 kg/d | all year | D050 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | D050 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | D050 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | D050 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | D050 |
| Phosphorus, total [as P] | monthly average | ≤ .3 mg/L | all year | D050 |
| Phosphorus, total [as P] | monthly average | ≤ 1.7 kg/d | all year | D050 |
| Sulfate, total [as SO4] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | D050 |
| Coliform, fecal MPN + membrane ftl 44.5 C | monthly geometric mean | ≤ 200 #/100mL | Apr–Oct | D050 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D050 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D050 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D050 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | Apr–Oct | D050 |
| Solids, total dissolved | monthly average | report only (mg/L) | Mar, Sep | D050 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | D050 |
| Mercury, dissolved [as Hg] | daily maximum | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | D050 |
| Mercury, total [as Hg] | monthly average | ≤ 11 ng/L | Jan, Mar, May, Jul, Sep, Nov | D050 |
| Mercury, total [as Hg] | daily maximum | ≤ 25.3 ng/L | Jan, Mar, May, Jul, Sep, Nov | D050 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | D050 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 40 mg/L | all year | D050 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 141.9 kg/d | all year | D050 |
| BOD, carbonaceous [5 day, 20 C] | maximum weekly average | ≤ 227.1 kg/d | all year | D050 |
| BOD, carb-5 day, 20 deg C, percent removal | monthly average minimum | ≥ 85 % | all year | D050 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | D050 |
| Precipitation, total defined period/in | monthly total | report only (in) | all year | S051 |
| pH | monthly minimum | report only (SU) | all year | S051 |
| pH | monthly maximum | report only (SU) | all year | S051 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | S051 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | S051 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | S051 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | S051 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | S051 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | S051 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | S051 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | S051 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | S051 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Mar, May, Jul, Sep, Nov | S051 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | S051 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | S051 |
Cited limits by parameter: Minnesota's rules and the federal ones.
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