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Sewage treatment plant, major discharger, Howell, Michigan. NPDES permit MI0021113, in force until Oct 1, 2027. Last 12 months: over a limit 11 times (last September 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Static 48 Hr Chronic Pimphales Promelas, monthly average | 1.3 | ≤ 1.1 tox chronic | 18% |
| November 2025 | Static 48 Hr Chronic Pimphales Promelas, monthly average | 4.7 | ≤ 1.1 tox chronic | 327% |
| November 2025 | TU Static 24 Hr Acute Pimephales promelas, daily maximum | 1.5 | ≤ 1 tox acute | 50% |
| December 2025 | Solids, total suspended, monthly average | 20.9 | ≤ 20 mg/L | 5% |
| January 2026 | Static 48 Hr Chronic Pimphales Promelas, monthly average | 2.36 | ≤ 1.1 tox chronic | 115% |
| January 2026 | TU Static 24 Hr Acute Pimephales promelas, daily maximum | 2.25 | ≤ 1 tox acute | 125% |
| January 2026 | Toxicity [acute], Ceriodaphnia dubia, daily maximum | 2.22 | ≤ 1 tox acute | 122% |
| January 2026 | Toxicity, choice of species, monthly average | 2.36 | ≤ 1.1 tox chronic | 115% |
| August 2026 | Nitrogen, ammonia total [as N], daily maximum | 3.5 | ≤ 2 mg/L | 75% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | .804 | ≤ .5 mg/L | 61% |
| September 2026 | Nitrogen, ammonia total [as N], daily maximum | 6.35 | ≤ 2 mg/L | 218% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | May–Oct | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 410 lb/qtr | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 610 lb/qtr | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.9 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 140 lb/qtr | Apr | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 200 lb/qtr | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 lb/qtr | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 120 lb/qtr | Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 41 lb/qtr | May–Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .5 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 10 lb/qtr | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/qtr) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide [A] | monthly average | ≤ 5.5 ug/L | all year | 001 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide [A] | monthly average | ≤ .11 lb/qtr | all year | 001 |
| Cyanide [A] | daily maximum | report only (lb/qtr) | all year | 001 |
| Toxicity, choice of species | monthly average | ≤ 1.1 tox chronic | all year | 001 |
| Toxicity, choice of species | value | report only (tox chronic) | all year | 001 |
| Hexachlorobutadiene | monthly average | < .053 ug/L | all year | 001 |
| Hexachlorobutadiene | daily maximum | report only (ug/L) | all year | 001 |
| Hexachlorobutadiene | monthly average | < .0011 lb/qtr | all year | 001 |
| Hexachlorobutadiene | daily maximum | report only (lb/qtr) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 38 ug/L | all year | 001 |
| Perfluorooctanesulfonate | daily maximum | report only (ng/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | ≤ 1 tox acute | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (lb/qtr) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/qtr) | all year | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 2 ng/L | all year | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .000041 lb/qtr | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 9 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 30 mg/L | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 23 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 14 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 410 lb/qtr | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 310 lb/qtr | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 82 lb/qtr | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 180 lb/qtr | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 610 lb/qtr | Jan, Feb, Mar, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 470 lb/qtr | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 200 lb/qtr | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 290 lb/qtr | Nov | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Dec | 001 |
| BOD, carb-5 day, 20 deg C, percent removal | daily minimum | report only (%) | Jan, Feb, Mar, Dec | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Apr, Dec | 001 |
| Solids, suspended percent removal | daily minimum | report only (%) | Jan, Feb, Mar, Apr, Dec | 001 |
| TU Static 24 Hr Acute Pimephales promelas | daily maximum | ≤ 1 tox acute | all year | 001 |
| Static 48 Hr Chronic Pimphales Promelas | monthly average | ≤ 1.1 tox chronic | all year | 001 |
| Static 48 Hr Chronic Pimphales Promelas | value | report only (tox chronic) | all year | 001 |
| Solids, total | monthly minimum | report only (%) | all year | SLD |
| Solids, total | monthly average | report only (%) | all year | SLD |
| Solids, total | monthly maximum | report only (%) | all year | SLD |
| Arsenic, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Arsenic, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Arsenic, dry weight | monthly maximum | ≤ 75 mg/kg | all year | SLD |
| Selenium, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Selenium, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Selenium, dry weight | monthly maximum | ≤ 100 mg/kg | all year | SLD |
| Copper, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Copper, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Copper, dry weight | monthly maximum | ≤ 4300 mg/kg | all year | SLD |
| Cadmium, dry weight | monthly minimum | report only (mg/kg) | all year | SLD |
| Cadmium, dry weight | monthly average | report only (mg/kg) | all year | SLD |
| Cadmium, dry weight | monthly maximum | ≤ 85 mg/kg | all year | SLD |
| Nitrogen, total Kjeldahl | monthly minimum | report only (mg/kg) | all year | SLD |
| Nitrogen, total Kjeldahl | monthly average | report only (mg/kg) | all year | SLD |
| Nitrogen, total Kjeldahl | monthly maximum | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly minimum | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly average | report only (mg/kg) | all year | SLD |
| Molybdenum, sludge, total, dry weight [as Mo] | monthly maximum | ≤ 75 mg/kg | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly minimum | report only (mg/kg) | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly average | report only (mg/kg) | all year | SLD |
| Zinc, sludge, total, dry weight [as Zn] | monthly maximum | ≤ 7500 mg/kg | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly minimum | report only (mg/kg) | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly average | report only (mg/kg) | all year | SLD |
| Lead, sludge, total, dry weight [as Pb] | monthly maximum | ≤ 840 mg/kg | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly minimum | report only (mg/kg) | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly average | report only (mg/kg) | all year | SLD |
| Nickel, sludge, total, dry weight [as Ni] | monthly maximum | ≤ 420 mg/kg | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly minimum | report only (mg/kg) | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly average | report only (mg/kg) | all year | SLD |
| Nitrogen, sludge, total, dry weight [as N] | monthly maximum | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly minimum | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly average | report only (mg/kg) | all year | SLD |
| Mercury, sludge, total, dry weight [as Hg] | monthly maximum | ≤ 57 mg/kg | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly minimum | report only (mg/kg) | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly average | report only (mg/kg) | all year | SLD |
| Potassium, sludge, total, dry weight [as K] | monthly maximum | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly minimum | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly average | report only (mg/kg) | all year | SLD |
| Phosphorus, sludge, total, dry weight [as P] | monthly maximum | report only (mg/kg) | all year | SLD |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], monthly average | 60 lb/qtr (Apr) | tighter | — | — |
| Nitrogen, ammonia total [as N], monthly average | 74 lb/qtr (Jan, Feb, Mar, Dec) | tighter | — | — |
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/MI0021113 · MCP: https://passage-data.com/mcp