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Blast Furnaces And Steel Mills, major discharger, Middletown, Ohio. NPDES permit OH0009997, in force until Feb 28, 2027. Last 12 months: over a limit once (last July 2026), 20 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | Zinc, total [as Zn], daily maximum | 3185 | ≤ 2610 ug/L | 22% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Solids, total suspended | monthly average | ≤ 2270 kg/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 7073 kg/d | all year | 001 |
| Oil and grease, hexane extr method | monthly average | ≤ 104 kg/d | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 296 kg/d | all year | 001 |
| Lead, total [as Pb] | monthly average | ≤ 3.18 kg/d | all year | 001 |
| Lead, total [as Pb] | daily maximum | ≤ 10.5 kg/d | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 3.43 kg/d | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 15.7 kg/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 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.1 mg/L | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 16.5 kg/d | May–Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 25 kg/d | May–Oct | 002 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 002 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 003 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Oxidants, total residual | daily maximum | ≤ .0024 mg/L | Mar, Jun, Aug, Dec | 003 |
| Oxidants, total residual | daily maximum | ≤ .044 kg/d | Mar, Jun, Aug, Dec | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Mercury, total low level | monthly average | report only (ng/L) | Mar, Jun, Aug, Dec | 003 |
| Mercury, total low level | daily maximum | report only (ng/L) | Mar, Jun, Aug, Dec | 003 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 003 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 004 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 004 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 004 |
| Toxicity, choice of species | monthly average | report only (tox acute) | Mar, Jun, Aug, Dec | 004 |
| Toxicity, choice of species | daily maximum | report only (tox acute) | Mar, Jun, Aug, Dec | 004 |
| Chronic toxicity, daphnia magnia 21 dy | monthly average | report only (% mortality) | Mar, Jun, Aug, Dec | 004 |
| Chronic toxicity, daphnia magnia 21 dy | daily maximum | report only (% mortality) | Mar, Jun, Aug, Dec | 004 |
| Oxidants, total residual | daily maximum | ≤ .0024 mg/L | all year | 004 |
| Oxidants, total residual | daily maximum | ≤ .027 kg/d | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 2126 mg/L | all year | 004 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 39182 kg/d | all year | 004 |
| pH | daily minimum | report only (SU) | all year | 005 |
| pH | daily maximum | report only (SU) | all year | 005 |
| Solids, total suspended | monthly average | ≤ 977 kg/d | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 1950 kg/d | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | ≤ 227 kg/d | all year | 005 |
| Lead, total [as Pb] | monthly average | ≤ 2.55 kg/d | all year | 005 |
| Lead, total [as Pb] | daily maximum | ≤ 4.9 kg/d | all year | 005 |
| Zinc, total [as Zn] | monthly average | ≤ 2.69 kg/d | all year | 005 |
| Zinc, total [as Zn] | daily maximum | ≤ 6.74 kg/d | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| pH | daily minimum | ≥ 6.5 SU | Mar, Jun, Aug, Dec | 006 |
| pH | daily maximum | ≤ 9 SU | Mar, Jun, Aug, Dec | 006 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 008 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 008 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 008 |
| Oxygen demand, chem. [low level] [COD] | monthly average | report only (mg/L) | all year | 009 |
| Oxygen demand, chem. [low level] [COD] | daily maximum | report only (mg/L) | all year | 009 |
| pH | daily minimum | ≥ 6.5 SU | all year | 009 |
| pH | daily maximum | ≤ 9 SU | all year | 009 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 009 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 009 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | all year | 009 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| pH | daily minimum | ≥ 6.5 SU | all year | 011 |
| pH | daily maximum | ≤ 9 SU | all year | 011 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 011 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 011 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 011 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 011 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 011 |
| Oxidants, total residual | daily maximum | ≤ .0048 mg/L | all year | 011 |
| Oxidants, total residual | daily maximum | ≤ .19 kg/d | all year | 011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 011 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 011 |
| Mercury, total low level | monthly average | report only (ng/L) | all year | 011 |
| Mercury, total low level | daily maximum | report only (ng/L) | all year | 011 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | Aug | 011 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | Aug | 011 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | Aug | 011 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | Aug | 011 |
| pH | daily minimum | ≥ 6.5 SU | all year | 015 |
| pH | daily maximum | ≤ 9 SU | all year | 015 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 015 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 015 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 015 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 015 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 015 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 015 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 015 |
| Oxidants, total residual | daily maximum | ≤ .0024 mg/L | Mar, Jun, Aug, Dec | 015 |
| Oxidants, total residual | daily maximum | ≤ .016 kg/d | Mar, Jun, Aug, Dec | 015 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 015 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 015 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 015 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 015 |
| pH | daily minimum | report only (SU) | all year | 613 |
| pH | daily maximum | report only (SU) | all year | 613 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 613 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 613 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 613 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 613 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 205 kg/d | all year | 613 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 410 kg/d | all year | 613 |
| Cyanide, total [as CN] | monthly average | ≤ 5.7 kg/d | all year | 613 |
| Cyanide, total [as CN] | daily maximum | ≤ 11.4 kg/d | all year | 613 |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year | 613 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 613 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 613 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 613 |
| Phenolics, total recoverable | monthly average | ≤ .9 kg/d | all year | 613 |
| Phenolics, total recoverable | daily maximum | ≤ 1.8 kg/d | all year | 613 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 613 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 613 |
| pH | daily minimum | report only (SU) | all year | 614 |
| pH | daily maximum | report only (SU) | all year | 614 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 614 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 614 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 614 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 614 |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year | 614 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 614 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 614 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 614 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 614 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 614 |
| pH | daily minimum | report only (SU) | all year | 631 |
| pH | daily maximum | report only (SU) | all year | 631 |
| Solids, total suspended | monthly average | ≤ 522 kg/d | all year | 631 |
| Solids, total suspended | daily maximum | ≤ 1245 kg/d | all year | 631 |
| Lead, total [as Pb] | monthly average | ≤ 1.74 kg/d | all year | 631 |
| Lead, total [as Pb] | daily maximum | ≤ 7.48 kg/d | all year | 631 |
| Zinc, total [as Zn] | monthly average | ≤ 3.5 kg/d | all year | 631 |
| Zinc, total [as Zn] | daily maximum | ≤ 8 kg/d | all year | 631 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 631 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 631 |
| pH | daily minimum | report only (SU) | all year | 641 |
| pH | daily maximum | report only (SU) | all year | 641 |
| Solids, total suspended | monthly average | ≤ 850 kg/d | all year | 641 |
| Solids, total suspended | daily maximum | ≤ 1661 kg/d | all year | 641 |
| Oil and grease, hexane extr method | monthly average | ≤ 306 kg/d | all year | 641 |
| Oil and grease, hexane extr method | daily maximum | ≤ 856 kg/d | all year | 641 |
| Zinc, total [as Zn] | monthly average | ≤ 1.87 kg/d | all year | 641 |
| Zinc, total [as Zn] | daily maximum | ≤ 3.9 kg/d | all year | 641 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 641 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 641 |
| pH | daily minimum | report only (SU) | all year | 642 |
| pH | daily maximum | report only (SU) | all year | 642 |
| Solids, total suspended | monthly average | ≤ 31 mg/L | all year | 642 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | 642 |
| Oil and grease, hexane extr method | monthly average | ≤ 26 mg/L | all year | 642 |
| Oil and grease, hexane extr method | daily maximum | ≤ 52 mg/L | all year | 642 |
| Zinc, total [as Zn] | monthly average | ≤ 1480 ug/L | all year | 642 |
| Zinc, total [as Zn] | daily maximum | ≤ 2610 ug/L | all year | 642 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 642 |
| Flow, in conduit or thru treatment plant | daily maximum | ≤ .36 MGD | all year | 642 |
| Organics, total toxic [TTO] | daily maximum | ≤ 1704 ug/L | Sep | 642 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 800 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 800 |
| %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 (%) | Aug | 801 |
| %Effect Static Renewal 96Hr Acute Pimephales promelas | daily maximum | report only (%) | Aug | 801 |
| pH | daily minimum | report only (SU) | all year | 803 |
| pH | daily maximum | report only (SU) | all year | 803 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 803 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 803 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | all year | 803 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 803 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 803 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 803 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 803 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 803 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | 803 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | 803 |
| Chronic toxicity, daphnia magnia 21 dy | monthly average | report only (% mortality) | Mar, Jun, Aug, Dec | 804 |
| Chronic toxicity, daphnia magnia 21 dy | daily maximum | report only (% mortality) | Mar, Jun, Aug, Dec | 804 |
| %Effect Static Renewal 48Hr Acute D. magna | monthly average | report only (%) | Mar, Jun, Aug, Dec | 804 |
| %Effect Static Renewal 48Hr Acute D. magna | daily maximum | report only (%) | Mar, Jun, Aug, Dec | 804 |
Cited limits by parameter: Ohio's rules and the federal ones.
Same industry: the 56 Primary Metal Industries permits in Ohio.
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