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Blast Furnaces And Steel Mills, major discharger, Chesterton, Indiana. NPDES permit IN0000175, in force until Dec 31, 2026. Last 12 months: no values over a limit, 6 of 62 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 86 deg F | Jul, Aug | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 71 deg F | Apr | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 80 deg F | Oct | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 65 deg F | Mar, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 60 deg F | Jan, Feb | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 81 deg F | May | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 85 deg F | Sep | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 86 deg F | Jun | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 75 deg F | Nov | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 001 |
| Oil and grease, hexane extr method | monthly average | report only (lb/d) | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | 7-day maximum | ≤ .68 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ .86 mg/L | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | 7-day maximum | ≤ 720 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 915 lb/d | Jan | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 001 |
| Cyanide, free [as free] | monthly average | ≤ 4.4 ug/L | all year | 001 |
| Cyanide, free [as free] | daily maximum | ≤ 8.8 ug/L | all year | 001 |
| Cyanide, free [as free] | monthly average | ≤ 4.9 lb/d | all year | 001 |
| Cyanide, free [as free] | daily maximum | ≤ 9.8 lb/d | 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 |
| Selenium, total recoverable | monthly average | report only (lb/d) | all year | 001 |
| Selenium, total recoverable | daily maximum | report only (lb/d) | all year | 001 |
| Silver total recoverable | monthly average | ≤ .048 ug/L | all year | 001 |
| Silver total recoverable | daily maximum | < .097 ug/L | all year | 001 |
| Silver total recoverable | monthly average | ≤ .054 lb/d | all year | 001 |
| Silver total recoverable | daily maximum | ≤ .11 lb/d | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 150 ug/L | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 290 ug/L | all year | 001 |
| Zinc, total recoverable | monthly average | ≤ 168 lb/d | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 324 lb/d | all year | 001 |
| Copper, total recoverable | monthly average | ≤ .018 mg/L | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ .035 mg/L | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 20 lb/d | all year | 001 |
| Copper, total recoverable | daily maximum | ≤ 39 lb/d | all year | 001 |
| Phenolics, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | monthly average | ≤ 14 lb/d | all year | 001 |
| Phenolics, total recoverable | daily maximum | ≤ 22 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 | monthly average | ≤ 10 ug/L | all year | 001 |
| Chlorine, total residual | daily maximum | < 60 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 11 lb/d | all year | 001 |
| Chlorine, total residual | daily maximum | < 67 lb/d | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Mar, Jun, Sep, Dec | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Jan, Apr, Jul, Oct | 001 |
| Toxicity [acute], Ceriodaphnia dubia | maximum | ≤ 1 tox acute | Jan, Apr, Jul, Oct | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 1 tox chronic | Mar, Jun, Sep, Dec | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 1 tox chronic | Jan, Apr, Jul, Oct | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | maximum | ≤ 1 tox chronic | Jan, Apr, Jul, Oct | 001 |
| Mercury, total recoverable | monthly average | ≤ 1.3 ng/L | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | ≤ 3.2 ng/L | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | monthly average | ≤ .0015 lb/d | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Mercury, total recoverable | daily maximum | ≤ .0037 lb/d | Feb, Apr, Jun, Aug, Oct, Dec | 001 |
| Flow, pump out | monthly average | report only (MGD) | all year | 001 |
| Flow, pump out | daily maximum | report only (MGD) | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 69 deg F | Apr | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 55 deg F | Jan | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 63 deg F | Mar, Dec | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 57 deg F | Feb | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 77 deg F | May | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 82 deg F | Jun | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 88 deg F | Jul, Sep | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 81 deg F | Oct | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 72 deg F | Nov | 002 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 90 deg F | Aug | 002 |
| pH | daily minimum | ≥ 6 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 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 002 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease, hexane extr method | monthly average | report only (lb/d) | all year | 002 |
| Oil and grease, hexane extr method | daily maximum | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 002 |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, total [as CN] | monthly average | report only (lb/d) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (lb/d) | all year | 002 |
| Fluoride, total [as F] | monthly average | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | monthly average | report only (lb/d) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (lb/d) | 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 |
| Zinc, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (lb/d) | all year | 002 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (lb/d) | all year | 002 |
| Phenolics, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Phenolics, total recoverable | monthly average | report only (lb/d) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (lb/d) | 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 |
| Chlorine, total residual | monthly average | ≤ 10 ug/L | all year | 002 |
| Chlorine, total residual | daily maximum | < 60 ug/L | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 24 lb/d | all year | 002 |
| Chlorine, total residual | daily maximum | < 132 lb/d | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Flow rate | monthly average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| Flow rate | monthly average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 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 |
| Chlorine, total residual | monthly average | ≤ 10 ug/L | all year | 003 |
| Chlorine, total residual | daily maximum | < 60 ug/L | all year | 003 |
| Velocity of intake | daily maximum | report only (ft/sec) | all year | 003 |
| Velocity of intake | daily maximum | report only (ft/sec) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 011 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 011 |
| Solids, total suspended | monthly average | ≤ 7000 lb/d | all year | 011 |
| Solids, total suspended | daily maximum | ≤ 24530 lb/d | all year | 011 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 011 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 011 |
| Oil and grease, hexane extr method | daily maximum | ≤ 5584 lb/d | all year | 011 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 011 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 011 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 011 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 011 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 011 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 173 lb/d | all year | 011 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 011 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 517 lb/d | all year | 011 |
| Cyanide, total [as CN] | monthly average | report only (mg/L) | all year | 011 |
| Cyanide, total [as CN] | daily maximum | report only (mg/L) | all year | 011 |
| Cyanide, total [as CN] | monthly average | report only (lb/d) | all year | 011 |
| Cyanide, total [as CN] | daily maximum | ≤ 21 lb/d | 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 |
| Selenium, total recoverable | monthly average | report only (lb/d) | all year | 011 |
| Selenium, total recoverable | daily maximum | report only (lb/d) | all year | 011 |
| Zinc, total recoverable | monthly average | report only (mg/L) | all year | 011 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 011 |
| Zinc, total recoverable | monthly average | ≤ 28.4 lb/d | all year | 011 |
| Zinc, total recoverable | daily maximum | ≤ 85.2 lb/d | all year | 011 |
| Lead, total recoverable | monthly average | report only (mg/L) | all year | 011 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 011 |
| Lead, total recoverable | monthly average | ≤ 19.8 lb/d | all year | 011 |
| Lead, total recoverable | daily maximum | ≤ 40 lb/d | all year | 011 |
| Phenolics, total recoverable | monthly average | report only (mg/L) | all year | 011 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 011 |
| Phenolics, total recoverable | monthly average | report only (lb/d) | all year | 011 |
| Phenolics, total recoverable | daily maximum | report only (lb/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 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 011 |
| Chlorine, total residual | monthly average | report only (ug/L) | all year | 011 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 011 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 011 |
| Chlorine, total residual | daily maximum | < 32 lb/d | all year | 011 |
| Chlorine, total residual | daily maximum | ≤ 32 lb/d | all year | 011 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 111 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | monthly average | report only (pg/L) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | monthly average | report only (pg/L) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | daily maximum | < 10 pg/L | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | daily maximum | < 10 pg/L | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | monthly average | report only (lb/d) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | monthly average | report only (lb/d) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | daily maximum | report only (lb/d) | all year | 111 |
| 2,3,7,8-Tetrachlorodibenzofuran | daily maximum | report only (lb/d) | all year | 111 |
Cited limits by parameter: Indiana's rules and the federal ones.
Same industry: the 54 Primary Metal Industries permits in Indiana.
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