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Sewage treatment plant, Dearborn, Michigan. NPDES permit MI0025542 expired Oct 1, 2025; its limits still apply. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| September 2026 | Coliform, fecal general, daily maximum | 6734 | ≤ 400 #/100mL | 1584% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 106 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 106 |
| pH | daily minimum | report only (SU) | all year | 106 |
| pH | daily maximum | report only (SU) | all year | 106 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 106 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 106 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 106 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 106 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 106 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 106 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 106 |
| Chlorine, total residual | average value | report only (mg/L) | all year | 106 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 106 |
| Coliform, fecal general | daily maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 106 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 106 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 108 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 108 |
| pH | daily minimum | report only (SU) | all year | 108 |
| pH | daily maximum | report only (SU) | all year | 108 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 108 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 108 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 108 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 108 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 108 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 108 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 108 |
| Chlorine, total residual | average value | report only (mg/L) | all year | 108 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 108 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 108 |
| Coliform, fecal general | daily maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 108 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 117 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 117 |
| pH | daily minimum | report only (SU) | all year | 117 |
| pH | daily maximum | report only (SU) | all year | 117 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 117 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 117 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 117 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 117 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 117 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 117 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 117 |
| Chlorine, total residual | average value | report only (mg/L) | all year | 117 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 117 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 117 |
| Coliform, fecal general | daily maximum | ≤ 1000 #/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 117 |
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/MI0025542 · MCP: https://passage-data.com/mcp