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Sewage treatment plant, major discharger, Huron, Ohio. NPDES permit OH0020125 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 24 times (last September 2026), 26 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 8.5 | ≤ 3.8 mg/L | 124% |
| October 2025 | Nitrogen, ammonia total [as N], weekly maximum | 14.8 | ≤ 5.7 mg/L | 160% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 119 | ≤ 28.8 kg/d | 313% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 18.1 | ≤ 3.8 mg/L | 376% |
| May 2026 | Nitrogen, ammonia total [as N], weekly maximum | 196 | ≤ 43.2 kg/d | 354% |
| May 2026 | Nitrogen, ammonia total [as N], weekly maximum | 33.6 | ≤ 5.7 mg/L | 489% |
| June 2026 | Mercury, total low level, monthly average | .000017 | ≤ .000014 kg/d | 21% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 125 | ≤ 28.8 kg/d | 334% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 26.9 | ≤ 3.8 mg/L | 608% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 171 | ≤ 43.2 kg/d | 296% |
| June 2026 | Nitrogen, ammonia total [as N], weekly maximum | 41.9 | ≤ 5.7 mg/L | 635% |
| June 2026 | Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average | 3.9 | ≤ 1.43 tox chronic | 173% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 129 | ≤ 28.8 kg/d | 348% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 31.7 | ≤ 3.8 mg/L | 734% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 159 | ≤ 43.2 kg/d | 268% |
| July 2026 | Nitrogen, ammonia total [as N], weekly maximum | 47.7 | ≤ 5.7 mg/L | 737% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 57.9 | ≤ 28.8 kg/d | 101% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 9.63 | ≤ 3.8 mg/L | 153% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 132 | ≤ 43.2 kg/d | 206% |
| August 2026 | Nitrogen, ammonia total [as N], weekly maximum | 18.9 | ≤ 5.7 mg/L | 232% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 29.3 | ≤ 3.8 mg/L | 671% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | 96.3 | ≤ 28.8 kg/d | 234% |
| September 2026 | Nitrogen, ammonia total [as N], weekly maximum | 123 | ≤ 43.2 kg/d | 185% |
| September 2026 | Nitrogen, ammonia total [as N], weekly maximum | 33.9 | ≤ 5.7 mg/L | 495% |
| 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 | ≥ 5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 227 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 341 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 | ≤ 3.8 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 5.7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 28.8 kg/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly maximum | ≤ 43.2 kg/d | May–Oct | 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 | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 1.5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 7.57 kg/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 11.4 kg/d | 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 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Selenium, 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) | Mar, Jun, Aug, Dec | 001 |
| Copper, total recoverable | 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 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | May–Oct | 001 |
| Mercury, total low level | monthly average | ≤ 1.8 ng/L | all year | 001 |
| Mercury, total low level | daily maximum | ≤ 1700 ng/L | all year | 001 |
| Mercury, total low level | monthly average | ≤ .000014 kg/d | all year | 001 |
| Mercury, total low level | daily maximum | ≤ .0129 kg/d | all year | 001 |
| Cyanide, free available | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, free available | daily maximum | report only (ug/L) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | Aug | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | Aug | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | monthly average | report only (tox chronic) | Aug | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (tox chronic) | Aug | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | Jun, Aug | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | Jun, Aug | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | monthly average | ≤ 1.43 tox chronic | Jun, Aug | 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 | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 190 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 303 kg/d | all year | 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) | Dec | 581 |
| Nitrogen, ammonia in bottom deposits | daily maximum | report only (mg/kg) | Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/kg) | Dec | 581 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/kg) | Dec | 581 |
| Phosphorous, total, in bottom deposits | monthly average | report only (mg/kg) | Dec | 581 |
| Phosphorous, total, in bottom deposits | daily maximum | report only (mg/kg) | Dec | 581 |
| Potassium, in bottom deposits | monthly average | report only (mg/kg) | Dec | 581 |
| Potassium, in bottom deposits | daily maximum | report only (mg/kg) | Dec | 581 |
| Arsenic, dry weight | daily maximum | ≤ 75 mg/kg | Dec | 581 |
| Cadmium, in bottom deposits [dry wgt] | daily maximum | ≤ 85 mg/kg | Dec | 581 |
| Copper in bottom deposits [dry wgt] | daily maximum | ≤ 4300 mg/kg | Dec | 581 |
| Lead, total dry weight [as Pb] | daily maximum | ≤ 840 mg/kg | Dec | 581 |
| Nickel, tot in bottom deposits [dry wgt] | daily maximum | ≤ 420 mg/kg | Dec | 581 |
| Zinc in bottom deposits [dry wgt] | daily maximum | ≤ 7500 mg/kg | Dec | 581 |
| Selenium, dry weight | daily maximum | ≤ 100 mg/kg | Dec | 581 |
| Fecal coliform | daily maximum | ≤ 2000000 MPN/g | Dec | 581 |
| Biosolids weight indluding admixtures | monthly average | report only (dry ton) | Dec | 581 |
| Biosolids weight indluding admixtures | daily maximum | report only (dry ton) | Dec | 581 |
| Sludge weight, dry | monthly average | report only (dry ton) | Dec | 581 |
| Sludge weight, dry | daily maximum | report only (dry ton) | Dec | 581 |
| Mercury, tot in bot deposits [dry wgt] | daily maximum | ≤ 57 mg/kg | Dec | 581 |
| Molybdenum, sludge, total, dry weight [as Mo] | daily maximum | ≤ 75 mg/kg | 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 |
| Sludge waste from secondary clarifiers | monthly average | report only (gal) | Dec | 588 |
| Sludge waste from secondary clarifiers | daily maximum | report only (gal) | Dec | 588 |
| pH | daily minimum | report only (SU) | all year | 601 |
| pH | daily maximum | report only (SU) | all year | 601 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 601 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 601 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 601 |
| Mercury, total low level | daily maximum | report only (ng/L) | 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 |
| 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 (%) | Aug | 801 |
| %Effect Static Renewal 48Hr Acute Ceriodaphnia dubia | daily maximum | report only (%) | Aug | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | monthly average | report only (%) | Jun, Aug | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | Jun, Aug | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | monthly average | report only (%) | Aug | 801 |
| %Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia | daily maximum | report only (%) | Aug | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | monthly average | report only (%) | Jun, Aug | 801 |
| %Effect Static Renewal 7Day Chronic Pimephales promelas | daily maximum | report only (%) | Jun, Aug | 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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