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Sewage treatment plant, Onsted, Michigan. NPDES permit MI0028304, in force until Oct 1, 2028. Last 12 months: no values over a limit, 31 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar, Apr, May, Oct, Nov, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Apr, May, Oct, Nov, Dec | 001 |
| pH | daily maximum | ≤ 9 SU | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | May, Oct | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Nov | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Mar, Apr, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | May, Oct | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 85 lb/d | May, Oct | 001 |
| Solids, total suspended | monthly average | ≤ 160 lb/d | Nov | 001 |
| Solids, total suspended | monthly average | ≤ 380 lb/d | Mar, Apr, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 130 lb/d | May, Oct | 001 |
| Solids, total suspended | 7-day average | ≤ 240 lb/d | Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 560 lb/d | Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.4 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.9 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.5 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9 mg/L | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | May, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 43 lb/d | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 21 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 56 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 110 lb/d | Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 27 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 11 lb/d | May, Oct | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 110 lb/d | Apr | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 3 ng/L | Mar, Apr, Dec | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 3 ng/L | May, Oct | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 3 ng/L | Nov | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .000037 lb/d | Mar, Apr, Dec | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .0000085 lb/d | May, Oct | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .000016 lb/d | Nov | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | Mar, Apr, May, Oct, Nov, Dec | 001 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | Mar, Apr, May, Oct, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 13 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 17 mg/L | Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 13 mg/L | May, Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 25 mg/L | Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | May, Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 70 lb/d | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 210 lb/d | Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 37 lb/d | May, Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 110 lb/d | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 310 lb/d | Mar, Apr, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 57 lb/d | May, Oct | 001 |
| 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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