Passage Data · Check a report · Use it from your AI
Sewage treatment plant, major discharger, Mount Pleasant, Michigan. NPDES permit MI0023655 expired Mar 5, 2025; its limits still apply. Last 12 months: over a limit 6 times (last November 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Phosphorus, total [as P], 30-day average | 4.35 mg/L | ≤ 1 mg/L | 335% |
| October 2025 | Phosphorus, total [as P], 30-day average | 59.9 lb/d | ≤ 35 lb/d | 71% |
| October 2025 | Phosphorus, total [as P], 7-day average | 17.8 mg/L | ≤ 2 mg/L | 790% |
| October 2025 | Phosphorus, total [as P], 7-day average | 241.1 lb/d | ≤ 69 lb/d | 249% |
| November 2025 | Phosphorus, total [as P], 30-day average | 2.39 mg/L | ≤ 1 mg/L | 139% |
| November 2025 | Phosphorus, total [as P], 7-day average | 3.4 mg/L | ≤ 2 mg/L | 70% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | all year |
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | 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 | 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, Oct, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 26 mg/L | Jun–Sep |
| Solids, total suspended | 30-day average | ≤ 26 mg/L | Jun–Sep |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 39 mg/L | Jun–Sep |
| Solids, total suspended | 7-day average | ≤ 39 mg/L | Jun–Sep |
| Solids, total suspended | 30-day average | ≤ 1000 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 1000 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 30-day average | ≤ 900 lb/d | Jun–Sep |
| Solids, total suspended | 30-day average | ≤ 900 lb/d | Jun–Sep |
| Solids, total suspended | 7-day average | ≤ 1600 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 1600 lb/d | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 1300 lb/d | Jun–Sep |
| Solids, total suspended | 7-day average | ≤ 1300 lb/d | Jun–Sep |
| 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 (lb/d) | all year |
| Solids, total suspended | monthly average | report only (lb/d) | all year |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 160 lb/d | May–Sep |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 160 lb/d | May–Sep |
| Phosphorus, total [as P] | 30-day average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | 30-day 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] | 30-day average | ≤ 35 lb/d | all year |
| Phosphorus, total [as P] | 30-day average | ≤ 35 lb/d | all year |
| Phosphorus, total [as P] | 7-day average | ≤ 69 lb/d | all year |
| Phosphorus, total [as P] | 7-day average | ≤ 69 lb/d | all year |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | 30-day 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 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year |
| E. coli | daily maximum | ≤ 410 #/100mL | all year |
| E. coli | daily maximum | ≤ 410 #/100mL | all year |
| Cyanide, free available | 30-day average | ≤ 21 ug/L | all year |
| Cyanide, free available | 30-day average | ≤ 21 ug/L | all year |
| Cyanide, free available | 30-day average | ≤ .7 lb/d | all year |
| Cyanide, free available | 30-day average | ≤ .7 lb/d | all year |
| Mercury, total [as Hg] | 30-day average | report only (ng/L) | all year |
| Mercury, total [as Hg] | 30-day average | report only (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] | 30-day average | report only (lb/d) | all year |
| Mercury, total [as Hg] | 30-day average | report only (lb/d) | all year |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | 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] | daily maximum | report only (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] | daily maximum | report only (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] | daily maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year |
| Mercury, total [as Hg] | rolling average | ≤ 7 ng/L | all year |
| Mercury, total [as Hg] | rolling average | ≤ 7 ng/L | all year |
| Mercury, total [as Hg] | rolling average | ≤ .00024 lb/d | all year |
| Mercury, total [as Hg] | rolling average | ≤ .00024 lb/d | all year |
| Coliform, fecal general | maximum monthly geometric mean | ≤ 200 #/100mL (alert, not enforceable) | all year |
| Coliform, fecal general | maximum monthly geometric mean | ≤ 200 #/100mL (alert, not enforceable) | all year |
| Coliform, fecal general | maximum 7-day geometric mean | ≤ 400 #/100mL (alert, not enforceable) | all year |
| Coliform, fecal general | maximum 7-day geometric mean | ≤ 400 #/100mL (alert, not enforceable) | all year |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 25 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 7 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 7 mg/L | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 40 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| 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] | 30-day average | ≤ 860 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 860 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 240 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 30-day average | ≤ 240 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 1400 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 1400 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 340 lb/d | May–Sep |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 340 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 (lb/d) | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (lb/d) | all year |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| BOD, carb-5 day, 20 deg C, percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Solids, suspended percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Solids, suspended percent removal | minimum % removal | ≥ 85 % | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| Outfall observation,visual, y/n response | 7-day average | report only (N=0;Y=1) | all year |
| Outfall observation,visual, y/n response | 7-day average | report only (N=0;Y=1) | all year |
Cited limits by parameter: Michigan's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MI0023655 · MCP: https://passage-data.com/mcp