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Sewage treatment plant, major discharger, Huron, Ohio. NPDES permit OH0053082, in force until Nov 30, 2028. Last 12 months: over a limit 14 times (last September 2026), 26 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Mercury, total low level, monthly average | .000012 | ≤ .00001 kg/d | 20% |
| April 2026 | Phosphorus, total [as P], weekly maximum | 7.6 | ≤ 6.82 kg/d | 11% |
| May 2026 | E. coli, MTEC-MF, weekly geometric mean | 1890 | ≤ 284 MPN/100mL | 565% |
| June 2026 | E. coli, MTEC-MF, monthly geometric mean | T | ≤ 126 MPN/100mL | — |
| June 2026 | E. coli, MTEC-MF, weekly geometric mean | T | ≤ 284 MPN/100mL | — |
| August 2026 | BOD, carbonaceous [5 day, 20 C], weekly maximum | 200 | ≤ 182 kg/d | 10% |
| August 2026 | E. coli, MTEC-MF, weekly geometric mean | 1870 | ≤ 284 MPN/100mL | 558% |
| August 2026 | Mercury, total low level, monthly average | .000011 | ≤ .00001 kg/d | 10% |
| August 2026 | Mercury, total low level, monthly average | 2.8 | ≤ 2.4 ng/L | 17% |
| August 2026 | Oxygen, dissolved [DO], daily minimum | 3 | ≥ 5 mg/L | 40% |
| August 2026 | Phosphorus, total [as P], monthly average | 4.61 | ≤ 4.55 kg/d | 1% |
| August 2026 | Phosphorus, total [as P], weekly maximum | 15.1 | ≤ 6.82 kg/d | 121% |
| August 2026 | Solids, total suspended, weekly maximum | 320 | ≤ 205 kg/d | 56% |
| September 2026 | pH, minimum, daily minimum | 6.4 | ≥ 6.5 SU | — |
| 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 | ≤ 137 kg/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 205 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 | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia 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 | ≤ 4.55 kg/d | all year | 001 |
| Phosphorus, total [as P] | weekly maximum | ≤ 6.82 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 |
| 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 | daily maximum | ≤ 12 ug/L | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .055 kg/d | all year | 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 | ≤ 2.4 ng/L | all year | 001 |
| Mercury, total low level | daily maximum | ≤ 1700 ng/L | all year | 001 |
| Mercury, total low level | monthly average | ≤ .00001 kg/d | all year | 001 |
| Mercury, total low level | daily maximum | ≤ .00773 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) | 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) | Mar, Jun, Aug, Dec | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | Mar, Jun, Aug, Dec | 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 | ≤ 114 kg/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly maximum | ≤ 182 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 |
| Cadmium, total recoverable | monthly average | report only (ug/L) | all year | 601 |
| Cadmium, total recoverable | daily maximum | report only (ug/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 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 602 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 602 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 602 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], monthly average | 3 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | new | 4.95 mg/L (6 values) | 1.65× |
| Nitrogen, ammonia total [as N], monthly average | 1 mg/L (May–Oct) | new | 6.195 mg/L (6 values) | 6.2× |
| Phosphorus, total [as P], monthly average | 0.5 mg/L | tighter | 0.505 mg/L (12 values) | 1.01× |
| BOD, carbonaceous [5 day, 20 C], monthly average | 10 mg/L | tighter | 9.5 mg/L (11 values) | 0.95× |
| BOD, carbonaceous [5 day, 20 C], monthly average | 91 kg/d | tighter | 26 kg/d (11 values) | 0.286× |
| BOD, carbonaceous [5 day, 20 C], weekly maximum | 140 kg/d | tighter | 41 kg/d (11 values) | 0.293× |
| BOD, carbonaceous [5 day, 20 C], weekly maximum | 15 mg/L | tighter | 14 mg/L (11 values) | 0.933× |
| Mercury, total low level, monthly average | 1.9 ng/L | tighter | 1.1 ng/L (12 values) | 0.579× |
| Nitrogen, ammonia total [as N], monthly average | 27 kg/d (Jan, Feb, Mar, Apr, Nov, Dec) | new | — | — |
| Nitrogen, ammonia total [as N], monthly average | 9.1 kg/d (May–Oct) | new | — | — |
| Nitrogen, ammonia total [as N], weekly maximum | 4.5 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | new | — | — |
| Nitrogen, ammonia total [as N], weekly maximum | 41 kg/d (Jan, Feb, Mar, Apr, Nov, Dec) | new | — | — |
| Nitrogen, ammonia total [as N], weekly maximum | 14 kg/d (May–Oct) | new | — | — |
| Nitrogen, ammonia total [as N], weekly maximum | 1.5 mg/L (May–Oct) | new | — | — |
| Phosphorus, total [as P], monthly average | 4.5 kg/d | tighter | 1.3 kg/d (12 values) | 0.289× |
| Phosphorus, total [as P], weekly maximum | 6.8 kg/d | tighter | 1.9 kg/d (12 values) | 0.279× |
| Phosphorus, total [as P], weekly maximum | 0.75 mg/L | tighter | 0.615 mg/L (12 values) | 0.82× |
| Solids, total suspended, monthly average | 12 mg/L | tighter | 6.65 mg/L (12 values) | 0.554× |
| Solids, total suspended, monthly average | 110 kg/d | tighter | 16.5 kg/d (12 values) | 0.15× |
| Solids, total suspended, weekly maximum | 160 kg/d | tighter | 23 kg/d (12 values) | 0.144× |
| Solids, total suspended, weekly maximum | 18 mg/L | tighter | 8.75 mg/L (12 values) | 0.486× |
Cited limits by parameter: Ohio's rules and the federal ones.
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