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Sewage treatment plant, Mount Pleasant, Michigan. NPDES permit MI0054861 expired May 7, 2023; its limits still apply. Last 12 months: no values over a limit, 239 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Oct, Nov |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Oct, Nov |
| Oxygen, dissolved [DO] | daily minimum | > 5 mg/L | Jan, Feb, Mar, Dec |
| Oxygen, dissolved [DO] | daily minimum | > 5 mg/L | Jan, Feb, Mar, Dec |
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | Apr |
| Oxygen, dissolved [DO] | daily minimum | ≥ 4 mg/L | Apr |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | May–Sep |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | May–Sep |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | 7-day average | report only (lb/d) | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| pH | daily minimum | report only (SU) | all year |
| pH | daily minimum | report only (SU) | all year |
| pH | daily maximum | report only (SU) | all year |
| pH | daily maximum | report only (SU) | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Nov |
| Solids, total suspended | monthly average | ≤ 20 mg/L | May–Nov |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | May–Nov |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | May–Nov |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | monthly average | ≤ 97 lb/d | May–Nov |
| Solids, total suspended | monthly average | ≤ 97 lb/d | May–Nov |
| Solids, total suspended | monthly average | ≤ 145 lb/d | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | monthly average | ≤ 145 lb/d | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | 7-day average | ≤ 145 lb/d | May–Nov |
| Solids, total suspended | 7-day average | ≤ 145 lb/d | May–Nov |
| Solids, total suspended | 7-day average | ≤ 218 lb/d | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | 7-day average | ≤ 218 lb/d | Jan, Feb, Mar, Apr, Dec |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (mg/L) | all year |
| Solids, total suspended | 7-day average | report only (mg/L) | all year |
| Solids, total suspended | 7-day average | report only (mg/L) | all year |
| Solids, total suspended | 7-day average | report only (mg/L) | all year |
| Solids, total suspended | 7-day average | report only (mg/L) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Solids, total suspended | 7-day average | report only (lb/d) | all year |
| Solids, total suspended | 7-day average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20.8 mg/L | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 20.8 mg/L | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Apr |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Oct, Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Oct, Nov |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 2 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 2 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 11 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 101 lb/d | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 101 lb/d | Jan, Feb, Mar, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 29 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 29 lb/d | Apr |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 10 lb/d | Oct, Nov |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 10 lb/d | Oct, Nov |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 10 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 10 lb/d | May–Sep |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 1.7 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 1.7 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 1.5 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 1.5 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 4.8 lb/d | all year |
| Phosphorus, total [as P] | monthly average | ≤ 4.8 lb/d | all year |
| Phosphorus, total [as P] | monthly average | ≤ 4.8 lb/d | all year |
| Phosphorus, total [as P] | monthly average | ≤ 4.8 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 7.2 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 7.2 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 7.2 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | ≤ 7.2 lb/d | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | all year |
| E. coli | geometric mean | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 235 #/100mL | all year |
| E. coli | daily maximum | ≤ 235 #/100mL | all year |
| Mercury, total [as Hg] | monthly average | ≤ 3 ng/L | all year |
| Mercury, total [as Hg] | monthly average | ≤ 3 ng/L | all year |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | monthly average | ≤ .000013 lb/d | all year |
| Mercury, total [as Hg] | monthly average | ≤ .000013 lb/d | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | maximum | report only (ng/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 13 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 13 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 7 mg/L | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 7 mg/L | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 7 mg/L | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 7 mg/L | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | Apr |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 63 lb/d | Apr |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 63 lb/d | Apr |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 34 lb/d | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 34 lb/d | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 121 lb/d | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 121 lb/d | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 34 lb/d | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 34 lb/d | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 19 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 19 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 97 lb/d | Apr |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 97 lb/d | Apr |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | May–Nov |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 193 lb/d | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 193 lb/d | Jan, Feb, Mar, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | Oct, Nov |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 48 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | report only (lb/d) | all year |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | > 85 % | Jan, Feb, Mar, Dec |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | > 85 % | Jan, Feb, Mar, Dec |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec |
| Outfall observation,visual, y/n response | monthly average | report only (Y=0;N=1) | all year |
| Outfall observation,visual, y/n response | monthly average | report only (Y=0;N=1) | all year |
Cited limits by parameter: Michigan's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MI0054861 · MCP: https://passage-data.com/mcp