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Sewage treatment plant, Almont, Michigan. NPDES permit MI0020931, in force until Oct 1, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 20 mg/L | Jun–Oct |
| Solids, total suspended | monthly average | ≤ 30 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 | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 78 lb/d | Jun–Oct |
| Solids, total suspended | monthly average | ≤ 120 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | 7-day average | ≤ 120 lb/d | Jun–Oct |
| Solids, total suspended | 7-day average | ≤ 180 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.9 mg/L | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.1 mg/L | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.9 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.3 mg/L | Nov |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.7 mg/L | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 lb/d | May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15 lb/d | Nov |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16 lb/d | Jan, Feb, Mar, Apr, Dec |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 7.8 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 19 lb/d | May |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 17 lb/d | Nov |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 18 lb/d | Jan, Feb, Mar, Apr, Dec |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | ≤ 3.9 lb/d | all year |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | 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 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 16 mg/L | Jan, Feb, Mar, Apr, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 17 mg/L | May |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 24 mg/L | Jan, Feb, Mar, Apr, Dec |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 22 mg/L | Nov |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 25 mg/L | May |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 16 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 63 lb/d | Jan, Feb, Mar, Apr, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 59 lb/d | Nov |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 67 lb/d | May |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 39 lb/d | Jun–Oct |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 94 lb/d | Jan, Feb, Mar, Apr, Dec |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 86 lb/d | Nov |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 98 lb/d | May |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, suspended percent removal | daily minimum | report only (%) | Jan, Feb, Mar, Apr, May, Nov, Dec |
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/MI0020931 · MCP: https://passage-data.com/mcp