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Sewage treatment plant, major discharger, St Johns, Michigan. NPDES permit MI0026468, in force until Oct 1, 2029. Last 12 months: over a limit 2 times (last April 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Toxicity, choice of species, monthly average | 1.35 | ≤ 1 tox chronic | 35% |
| April 2026 | Toxicity, choice of species, monthly average | 1.35 | ≤ 1 tox chronic | 35% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | Apr–Oct | 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 | Apr–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 30 mg/L | Apr–Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | Jan, Feb, Mar, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 320 lb/d | Apr–Nov | 001 |
| Solids, total suspended | monthly average | ≤ 480 lb/d | Jan, Feb, Mar, Dec | 001 |
| Solids, total suspended | 7-day average | ≤ 480 lb/d | Apr–Nov | 001 |
| Solids, total suspended | 7-day average | ≤ 710 lb/d | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.5 mg/L | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6 mg/L | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 32 lb/d | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 71 lb/d | Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 95 lb/d | Jan, Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 63 lb/d | Apr | 001 |
| Nitrogen, ammonia total [as N] | 7-day average | ≤ 32 lb/d | May–Sep | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .75 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 12 lb/d | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | 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 |
| Selenium, total [as Se] | monthly average | ≤ 5 ug/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ .079 lb/d | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | all year | 001 |
| Cyanide [A] | monthly average | ≤ 5.2 ug/L | all year | 001 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide [A] | monthly average | ≤ .08 lb/d | all year | 001 |
| Cyanide [A] | daily maximum | report only (lb/d) | all year | 001 |
| Toxicity, choice of species | monthly average | ≤ 1 tox chronic | all year | 001 |
| Toxicity, choice of species | value | report only (tox chronic) | all year | 001 |
| Bromomethane | monthly average | ≤ 4.2 ug/L | all year | 001 |
| Bromomethane | daily maximum | report only (ug/L) | all year | 001 |
| Bromomethane | monthly average | ≤ .066 lb/d | all year | 001 |
| Bromomethane | daily maximum | report only (lb/d) | 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] | 12-month average | ≤ 3 ng/L | all year | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .000048 lb/d | 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/d) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | 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 | ≤ 8 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 9 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 6 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 12 mg/L | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 14 mg/L | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 10 mg/L | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 130 lb/d | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 140 lb/d | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 95 lb/d | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 190 lb/d | Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 220 lb/d | Apr | 001 |
| BOD, carbonaceous [5 day, 20 C] | 7-day average | ≤ 160 lb/d | May–Oct | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | Jan, Feb, Mar, Dec | 001 |
| Solids, suspended percent removal | daily minimum | report only (%) | Jan, Feb, Mar, 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 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 | 7.9 lb/d (May–Oct) | tighter | — | — |
| Nitrogen, ammonia total [as N], monthly average | 65 lb/d (Jan, Feb, Mar, Dec) | tighter | — | — |
| Nitrogen, ammonia total [as N], monthly average | 41 lb/d (Apr) | tighter | — | — |
Cited limits by parameter: Michigan's rules and the federal ones.
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