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Sewage treatment plant, Calumet, Michigan. NPDES permit MI0043982, in force until Sep 30, 2031. Last 12 months: over a limit 4 times (last September 2026), 4 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| April 2026 | 002 | Coliform, fecal general, 7-day geometric mean | 980.4 | ≤ 400 #/100mL | 145% |
| May 2026 | 002 | Coliform, fecal general, monthly geometric mean | 447.85 | ≤ 200 #/100mL | 124% |
| May 2026 | EQ1 | pH, daily minimum | 6.4 | ≥ 6.5 SU | — |
| September 2026 | EQ1 | Flow rate, instantaneous, daily maximum | 2.52 | ≤ 2.4 MGD | 5% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | average value | report only (ug/L) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 38 ug/L | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 001 |
| Coliform, fecal general | daily maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | average value | report only (ug/L) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 38 ug/L | all year | 002 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 002 |
| Coliform, fecal general | daily maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| pH | daily maximum | ≤ 10 SU | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Solids, total suspended | monthly average | ≤ 70 mg/L | Mar–Jun | 003 |
| Solids, total suspended | monthly average | ≤ 40 mg/L | Oct–Dec | 003 |
| Solids, total suspended | 7-day average | ≤ 100 mg/L | Mar–Jun | 003 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Oct–Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Carbon, dissolved organic [as C] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | 12-month average | ≤ 4 ng/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Mercury, total [as Hg] | 12-month average | ≤ .00019 lb/d | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | Mar, Apr, May, Jun, Oct, Nov, Dec | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| pH | daily maximum | ≤ 10 SU | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Solids, total suspended | monthly average | ≤ 70 mg/L | Mar–Jun | 004 |
| Solids, total suspended | monthly average | ≤ 40 mg/L | Oct–Dec | 004 |
| Solids, total suspended | 7-day average | ≤ 100 mg/L | Mar–Jun | 004 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Oct–Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | Mar, Apr, May, Jun, Oct, Nov, Dec | 004 |
| Flow rate, instantaneous | daily maximum | ≤ 2400000 gal/d | Jan, Feb, Jun, Jul, Aug, Sep, Oct, Nov, Dec | EQ1 |
| Flow rate, instantaneous | daily maximum | ≤ 5100000 gal/d | Mar–Jun | EQ1 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | EQ1 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | EQ1 |
| pH | daily minimum | ≥ 6.5 SU | all year | EQ1 |
| pH | daily maximum | ≤ 9 SU | all year | EQ1 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | EQ1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | EQ1 |
| Nitrogen, nitrite total [as N] | daily maximum | report only (mg/L) | all year | EQ1 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | EQ1 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | EQ1 |
| Nitrogen, inorganic total | daily maximum | report only (mg/L) | all year | EQ1 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | EQ1 |
| Sodium, total [as Na] | daily maximum | ≤ 400 mg/L | all year | EQ1 |
| Chloride [as Cl] | daily maximum | ≤ 500 mg/L | all year | EQ1 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | EQ1 |
| Iron, total [as Fe] | daily maximum | report only (ug/L) | all year | EQ1 |
| Manganese, total [as Mn] | daily maximum | report only (ug/L) | all year | EQ1 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | EQ1 |
| Flow rate, instantaneous | daily maximum | report only (gal/d) | all year | IF1 |
| Solids, total | monthly minimum | report only (%) | all year | SLD |
| Solids, total | monthly average | report only (%) | all year | SLD |
| Solids, total | monthly maximum | report only (%) | all year | SLD |
| Arsenic, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Arsenic, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Arsenic, dry weight | monthly maximum | ≤ 75 mg/kg | all year | SLD |
| Selenium, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Selenium, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Selenium, dry weight | monthly maximum | ≤ 100 mg/kg | all year | SLD |
| Copper, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Copper, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Copper, dry weight | monthly maximum | ≤ 4300 mg/kg | all year | SLD |
| Cadmium, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Cadmium, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Cadmium, dry weight | monthly maximum | ≤ 85 mg/kg | all year | SLD |
| Nitrogen, total Kjeldahl | monthly minimum | report only (mg/kg) | all year | SLD |
| Nitrogen, total Kjeldahl | monthly average | report only (mg/kg) | all year | SLD |
| Nitrogen, total Kjeldahl | monthly maximum | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly minimum | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly average | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly maximum | ≤ 75 mg/kg | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly minimum | report only (mg/kg) | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly average | report only (mg/kg) | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly maximum | ≤ 7500 mg/kg | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly minimum | report only (mg/kg) | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly average | report only (mg/kg) | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly maximum | ≤ 840 mg/kg | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly minimum | report only (mg/kg) | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly average | report only (mg/kg) | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly maximum | ≤ 420 mg/kg | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly minimum | report only (mg/kg) | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly average | report only (mg/kg) | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly maximum | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly minimum | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly average | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly maximum | ≤ 57 mg/kg | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly minimum | report only (mg/kg) | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly average | report only (mg/kg) | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly maximum | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly minimum | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly average | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly maximum | report only (mg/kg) | all year | SLD |
Cited limits by parameter: Michigan's rules and the federal ones.
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