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Sewage treatment plant, major discharger, Mount Pleasant, Michigan. NPDES permit MI0055808, in force until May 9, 2027. Last 12 months: no values over a limit, 2 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year |
| Oxygen, dissolved [DO] | minimum | ≥ 5 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 | weekly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly 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 | weekly average | report only (lb/d) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| pH | minimum | report only (SU) | all year |
| pH | minimum | report only (SU) | all year |
| pH | maximum | report only (SU) | all year |
| pH | maximum | report only (SU) | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Jun–Oct |
| Solids, total suspended | 30-day average | ≤ 20 mg/L | Jun–Oct |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | Jun–Oct |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | Jun–Oct |
| Solids, total suspended | 30-day average | ≤ 600 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 600 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 400 lb/d | Jun–Oct |
| Solids, total suspended | 30-day average | ≤ 400 lb/d | Jun–Oct |
| Solids, total suspended | 7-day average | ≤ 900 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 900 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 600 lb/d | Jun–Oct |
| Solids, total suspended | 7-day average | ≤ 600 lb/d | Jun–Oct |
| 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 | weekly average | report only (mg/L) | all year |
| Solids, total suspended | weekly 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 | weekly average | report only (lb/d) | all year |
| Solids, total suspended | weekly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 40 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | 30-day average | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | 30-day average | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | 30-day average | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, May, Nov, Dec |
| 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] | 7-day average | ≤ 2 mg/L | all year |
| Phosphorus, total [as P] | 7-day average | ≤ 2 mg/L | all year |
| Phosphorus, total [as P] | monthly average | ≤ 20 lb/d | all year |
| Phosphorus, total [as P] | monthly average | ≤ 20 lb/d | all year |
| Phosphorus, total [as P] | 7-day average | ≤ 40 lb/d | all year |
| Phosphorus, total [as P] | 7-day average | ≤ 40 lb/d | all year |
| Selenium, total [as Se] | 30-day average | ≤ 32 ug/L | all year |
| Selenium, total [as Se] | 30-day average | ≤ 32 ug/L | all year |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year |
| Selenium, total [as Se] | 30-day average | report only (lb/d) | all year |
| Selenium, total [as Se] | 30-day average | report only (lb/d) | all year |
| Selenium, total [as Se] | daily maximum | ≤ .64 lb/d | all year |
| Selenium, total [as Se] | daily maximum | ≤ .64 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 |
| E. coli | monthly average | ≤ 126 #/100mL | all year |
| E. coli | monthly average | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 410 #/100mL | all year |
| E. coli | daily maximum | ≤ 410 #/100mL | all year |
| Mercury, total [as Hg] | quarterly average | report only (ng/L) | all year |
| Mercury, total [as Hg] | quarterly average | report only (ng/L) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | quarterly average | report only (lb/d) | all year |
| Mercury, total [as Hg] | quarterly average | report only (lb/d) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (lb/d) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (lb/d) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | quarterly maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | rolling average | ≤ 2 ng/L | all year |
| Mercury, total [as Hg] | rolling average | ≤ 2 ng/L | all year |
| Mercury, total [as Hg] | rolling average | ≤ .00003 lb/d | all year |
| Mercury, total [as Hg] | rolling average | ≤ .00003 lb/d | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 10 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 10 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 500 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 500 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 80 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 80 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 800 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 800 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 200 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 200 lb/d | Jun–Oct |
| 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] | weekly average | report only (mg/L) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly 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] | weekly average | report only (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (lb/d) | all year |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, suspended percent removal | minimum value | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, suspended percent removal | minimum value | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Outfall observation,visual, y/n response | value | report only (Y=0;N=1) | all year |
| Outfall observation,visual, y/n response | value | report only (Y=0;N=1) | all year |
Cited limits by parameter: Michigan's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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