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Sewage treatment plant, major discharger, Bay City, Michigan. NPDES permit MI0022284 expired Oct 1, 2015; its limits still apply. Last 12 months: over a limit 8 times (last August 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Coliform, fecal general, 7-day geometric mean | 426 | ≤ 400 #/100mL | 7% |
| November 2025 | Coliform, fecal general, 7-day geometric mean | 2074 | ≤ 400 #/100mL | 419% |
| December 2025 | Coliform, fecal general, 7-day geometric mean | 692 | ≤ 400 #/100mL | 73% |
| June 2026 | Coliform, fecal general, 7-day geometric mean | 1567 | ≤ 400 #/100mL | 292% |
| June 2026 | Coliform, fecal general, monthly geometric mean | 264 | ≤ 200 #/100mL | 32% |
| July 2026 | Coliform, fecal general, 7-day geometric mean | 764 | ≤ 400 #/100mL | 91% |
| August 2026 | Coliform, fecal general, 7-day geometric mean | 569 | ≤ 400 #/100mL | 42% |
| August 2026 | Coliform, fecal general, monthly geometric mean | 235 | ≤ 200 #/100mL | 18% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 3 mg/L | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 004 |
| Solids, total suspended | monthly average | ≤ 3000 lb/d | all year | 004 |
| Solids, total suspended | 7-day average | ≤ 4500 lb/d | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.5 mg/L | May–Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | May–Sep | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 750 lb/d | May–Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | May–Sep | 004 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | monthly average | ≤ 100 lb/d | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 004 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | Jan, Apr, Jul, Oct | 004 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (ug/L) | all year | 004 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (ug/L) | all year | 004 |
| Polychlorinated biphenyls [PCBs] | monthly average | report only (lb/d) | all year | 004 |
| Polychlorinated biphenyls [PCBs] | daily maximum | report only (lb/d) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ 5 ng/L | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ .0005 lb/d | Jan, Apr, Jul, Oct | 004 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 004 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2500 lb/d | all year | 004 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 4000 lb/d | all year | 004 |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | ≥ 85 % | all year | 004 |
| BOD, carb-5 day, 20 deg C, percent removal | daily minimum | report only (%) | all year | 004 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 004 |
| Solids, suspended percent removal | daily minimum | report only (%) | all year | 004 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 013B |
| pH | daily minimum | report only (SU) | all year | 013B |
| pH | daily maximum | report only (SU) | all year | 013B |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 013B |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 013B |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 013B |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 013B |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 013B |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 013B |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 013B |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 013B |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 013B |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 013B |
| Chlorine, total residual | daily geometric mean | report only (mg/L) | all year | 013B |
| Coliform, fecal general | daily geometric mean | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 013B |
| Coliform, fecal general | daily geometric mean | ≤ 400 #/100mL | May–Oct | 013B |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 013B |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 013B |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 014 |
| pH | daily minimum | report only (SU) | all year | 014 |
| pH | daily maximum | report only (SU) | all year | 014 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 014 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 014 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 014 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 014 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 014 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 014 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 014 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 014 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 014 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 014 |
| Chlorine, total residual | daily geometric mean | report only (mg/L) | all year | 014 |
| Coliform, fecal general | daily average | ≤ 400 #/100mL | May–Oct | 014 |
| BOD, carbonaceous [5 day, 20 C] | monthly maximum | report only (mg/L) | all year | 014 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 014 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 018 |
| pH | daily minimum | report only (SU) | all year | 018 |
| pH | daily maximum | report only (SU) | all year | 018 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 018 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 018 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 018 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 018 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 018 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 018 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 018 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 018 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 018 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 018 |
| Chlorine, total residual | daily geometric mean | report only (mg/L) | all year | 018 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 018 |
| Coliform, fecal general | daily average | ≤ 400 #/100mL | May–Oct | 018 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 018 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 018 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 040 |
| pH | daily minimum | report only (SU) | all year | 040 |
| pH | daily maximum | report only (SU) | all year | 040 |
| Solids, total suspended | maximum monthly average | report only (mg/L) | all year | 040 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 040 |
| Nitrogen, ammonia total [as N] | maximum monthly average | report only (mg/L) | all year | 040 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 040 |
| Phosphorus, total [as P] | maximum monthly average | report only (mg/L) | all year | 040 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 040 |
| Flow, in conduit or thru treatment plant | maximum monthly average | report only (MGD) | all year | 040 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 040 |
| Flow, in conduit or thru treatment plant | maximum monthly average | report only (MGD) | all year | 040 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 040 |
| Chlorine, total residual | daily average | report only (mg/L) | all year | 040 |
| Coliform, fecal general | daily average | ≤ 400 #/100mL | May–Oct | 040 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 048 |
| pH | daily minimum | report only (SU) | all year | 048 |
| pH | daily maximum | report only (SU) | all year | 048 |
| Solids, total suspended | maximum monthly average | report only (mg/L) | all year | 048 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 048 |
| Nitrogen, ammonia total [as N] | maximum monthly average | report only (mg/L) | all year | 048 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 048 |
| Phosphorus, total [as P] | maximum monthly average | report only (mg/L) | all year | 048 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 048 |
| Flow, in conduit or thru treatment plant | maximum monthly average | report only (MGD) | all year | 048 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 048 |
| Flow, in conduit or thru treatment plant | maximum monthly average | report only (MGD) | all year | 048 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 048 |
| Chlorine, total residual | daily average | report only (mg/L) | all year | 048 |
| Coliform, fecal general | daily average | ≤ 400 #/100mL | May–Oct | 048 |
| 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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