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Sewage treatment plant, major discharger, Ann Arbor, Michigan. NPDES permit MI0022217 expired Oct 1, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 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 | monthly average | ≤ 20 mg/L | May–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | May–Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 4900 lb/d | May–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 7400 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 7400 lb/d | May–Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 11000 lb/d | Jan, Feb, Mar, Apr, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | = 15 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | = 6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | = 3700 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | = 980 lb/d | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 120 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 1500 lb/d | Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Oct | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 490 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Nov | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Apr | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | May, Jun, Sep | 001 |
| Phosphorus, total [as P] | monthly average | = .8 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jul, Aug | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Apr | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | May, Jun, Sep | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jul, Aug | 001 |
| Phosphorus, total [as P] | monthly average | = 150 lb/d | Apr | 001 |
| Phosphorus, total [as P] | monthly average | = 60 lb/d | May, Jun, Sep | 001 |
| Phosphorus, total [as P] | monthly average | = 200 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | = 50 lb/d | Jul, Aug | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Apr | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | May, Jun, Sep | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | Jul, Aug | 001 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide [A] | monthly average | = 7.4 ug/L | all year | 001 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide [A] | monthly average | = 1.8 lb/d | all year | 001 |
| Cyanide [A] | daily maximum | report only (lb/d) | 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 |
| Perfluorooctanoic acid (PFOA) | monthly average | report only (ng/L) | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanoic acid (PFOA) | monthly average | report only (lb/d) | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (lb/d) | all year | 001 |
| Perfluorooctanesulfonate | monthly average | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonate | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonate | monthly average | report only (lb/d) | all year | 001 |
| Perfluorooctanesulfonate | daily maximum | report only (lb/d) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 2 ng/L | all year | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .00049 lb/d | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | = 30 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 980 lb/d | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 3700 lb/d | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4900 lb/d | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 2500 lb/d | May–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | = 7400 lb/d | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 7400 lb/d | Apr | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, suspended percent removal | daily minimum | report only (%) | Jan, Feb, Mar, Apr, Dec | 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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MI0022217 · MCP: https://passage-data.com/mcp