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Sewage treatment plant, major discharger, Troy, Ohio. NPDES permit OH0027758, in force until May 31, 2027. Last 12 months: over a limit once (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| August 2026 | Oxygen, dissolved [DO], daily minimum | 5.34 | ≥ 6 mg/L | 11% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 6 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 21 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 31.5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 715 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 1060 kg/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6 mg/L | Mar, Apr, May, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 15 mg/L | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 9 mg/L | Mar, Apr, May, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 2.25 mg/L | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 341 kg/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 204 kg/d | Mar, Apr, May, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 50.3 kg/d | Jun–Sep | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 523 kg/d | Jan, Feb, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 307 kg/d | Mar, Apr, May, Oct, Nov | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 74.2 kg/d | Jun–Sep | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphate, ortho, dissolved [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphate, ortho, dissolved [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Barium, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| E. coli, MTEC-MF | monthly geometric mean | ≤ 126 MPN/100mL | May–Oct | 001 |
| E. coli, MTEC-MF | weekly geometric mean | ≤ 284 MPN/100mL | May–Oct | 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 |
| Mercury, total low level | monthly average | report only (ng/L) | Mar, Jun, Aug, Dec | 001 |
| Mercury, total low level | daily maximum | report only (ng/L) | Mar, Jun, Aug, Dec | 001 |
| Cyanide, free available | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Cyanide, free available | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | Oct | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | Oct | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average | report only (tox chronic) | Oct | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (tox chronic) | Oct | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | Oct | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | Oct | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox chronic) | Oct | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox chronic) | Oct | 001 |
| pH, maximum | daily maximum | ≤ 9 SU | all year | 001 |
| pH, minimum | daily minimum | ≥ 6.5 SU | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10.9 mg/L | Mar–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 17.9 mg/L | Jan, Feb, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 16.4 mg/L | Mar–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 26.9 mg/L | Jan, Feb, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 371 kg/d | Mar–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 609 kg/d | Jan, Feb, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 556 kg/d | Mar–Nov | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 901 kg/d | Jan, Feb, Dec | 001 |
| Overflows | monthly average | report only (occur/mo) | all year | 300 |
| Overflows | daily maximum | report only (occur/mo) | all year | 300 |
| Nitrogen, ammonia in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, ammonia in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Phosphorous, total, in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Phosphorous, total, in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Potassium, in bottom deposits | monthly average | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Potassium, in bottom deposits | daily maximum | report only (mg/kg) | Mar, Jun, Sep, Dec | 581 |
| Arsenic, dry weight | daily maximum | ≤ 75 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Cadmium, in bottom deposits [dry wgt] | daily maximum | ≤ 85 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Copper in bottom deposits [dry wgt] | daily maximum | ≤ 4300 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Lead, total dry weight [as Pb] | daily maximum | ≤ 840 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Nickel, tot in bottom deposits [dry wgt] | daily maximum | ≤ 420 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Zinc in bottom deposits [dry wgt] | daily maximum | ≤ 7500 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Selenium, dry weight | daily maximum | ≤ 100 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | monthly average | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | daily maximum | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Fecal coliform in sludge, CFU/gram | daily maximum | ≤ 2000000 CFU/g | Mar, Jun, Sep, Dec | 581 |
| Sludge weight, dry | monthly average | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Sludge weight, dry | daily maximum | report only (dry ton) | Mar, Jun, Sep, Dec | 581 |
| Mercury, tot in bot deposits [dry wgt] | daily maximum | ≤ 57 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Molybdenum, sludge, total, dry weight [as Mo] | daily maximum | ≤ 75 mg/kg | Mar, Jun, Sep, Dec | 581 |
| Biosolids weight indluding admixtures | monthly average | report only (dry ton) | Dec | 586 |
| Biosolids weight indluding admixtures | daily maximum | report only (dry ton) | Dec | 586 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 601 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 601 |
| Cyanide, total [as CN] | monthly average | report only (mg/L) | Mar, Jun, Aug, Dec | 601 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | Mar, Jun, Aug, Dec | 601 |
| Barium, total recoverable | monthly average | report only (ug/L) | all year | 601 |
| Barium, total recoverable | daily maximum | report only (ug/L) | all year | 601 |
| Nickel, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Zinc, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Cadmium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Lead, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Lead, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, total recoverable | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 601 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 601 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | Mar, Jun, Aug, Dec | 601 |
| Mercury, total low level | monthly average | report only (ng/L) | Mar, Jun, Aug, Dec | 601 |
| Mercury, total low level | daily maximum | report only (ng/L) | Mar, Jun, Aug, Dec | 601 |
| pH, maximum | daily maximum | report only (SU) | all year | 601 |
| pH, minimum | daily minimum | report only (SU) | all year | 601 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 601 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 601 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 602 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 602 |
| Bypass Volume | monthly average | report only (Mgal) | all year | 602 |
| Bypass Volume | daily maximum | report only (Mgal) | all year | 602 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 602 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | report only (mg/L) | all year | 602 |
| Bypass valve | monthly average | report only (occur/mo) | all year | 602 |
| Bypass valve | daily maximum | report only (occur/mo) | all year | 602 |
| Bypass of treatment | monthly average | report only (hr/mo) | all year | 602 |
| Bypass of treatment | daily maximum | report only (hr/mo) | all year | 602 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 801 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 801 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 801 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 801 |
| E. coli, MTEC-MF | monthly geometric mean | report only (MPN/100mL) | Jun–Aug | 801 |
| E. coli, MTEC-MF | daily maximum | report only (MPN/100mL) | Jun–Aug | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | monthly average | report only (%) | Oct | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | report only (%) | Oct | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | monthly average | report only (%) | Oct | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | Oct | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (%) | Oct | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (%) | Oct | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average | report only (%) | Oct | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (%) | Oct | 801 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 901 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 901 |
| pH | daily minimum | report only (SU) | all year | 901 |
| pH | daily maximum | report only (SU) | all year | 901 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 901 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 901 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 901 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 901 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 901 |
| E. coli, MTEC-MF | monthly geometric mean | report only (MPN/100mL) | Jun–Aug | 901 |
| E. coli, MTEC-MF | daily maximum | report only (MPN/100mL) | Jun–Aug | 901 |
Cited limits by parameter: Ohio's rules and the federal ones.
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