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Blast Furnaces And Steel Mills, major discharger, Sterling, Illinois. NPDES permit IL0076473 expired Mar 31, 2024; its limits still apply. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | ≤ 93 deg F | all year | 004 |
| pH | daily minimum | ≥ 6 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 72 lb/d | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 205 lb/d | all year | 004 |
| Oil & Grease | 30-day average | ≤ 15 mg/L | all year | 004 |
| Oil & Grease | daily maximum | ≤ 30 mg/L | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | 30-day average | ≤ 72 lb/d | all year | 004 |
| Oil & Grease | daily maximum | ≤ 205 lb/d | all year | 004 |
| Oil & Grease | daily maximum | ≤ 402 lb/d | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 004 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 004 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 004 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 004 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 004 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 004 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 004 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 004 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 004 |
| Chromium, total [as Cr] | annual average | ≤ 1 mg/L | all year | 004 |
| Chromium, total [as Cr] | annual average | ≤ 1 mg/L | all year | 004 |
| Chromium, total [as Cr] | annual maximum | ≤ 2 mg/L | all year | 004 |
| Chromium, total [as Cr] | annual maximum | ≤ 2 mg/L | all year | 004 |
| Chromium, total [as Cr] | annual average | ≤ .2 lb/d | all year | 004 |
| Chromium, total [as Cr] | annual average | ≤ .2 lb/d | all year | 004 |
| Chromium, total [as Cr] | annual maximum | ≤ .6 lb/d | all year | 004 |
| Chromium, total [as Cr] | annual maximum | ≤ .6 lb/d | all year | 004 |
| Chromium, total [as Cr] | annual maximum | report only (lb/d) | all year | 004 |
| Chromium, total [as Cr] | annual maximum | report only (lb/d) | all year | 004 |
| Copper, total [as Cu] | daily maximum | ≤ .248 mg/L | all year | 004 |
| Copper, total [as Cu] | daily maximum | ≤ 1.7 lb/d | all year | 004 |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year | 004 |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year | 004 |
| Iron, total [as Fe] | 30-day average | ≤ 9.6 lb/d | all year | 004 |
| Iron, total [as Fe] | daily maximum | ≤ 27 lb/d | all year | 004 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 004 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 004 |
| Lead, total [as Pb] | 30-day average | ≤ .2 mg/L | all year | 004 |
| Lead, total [as Pb] | daily maximum | ≤ .4 mg/L | all year | 004 |
| Lead, total [as Pb] | 30-day average | ≤ .961 lb/d | all year | 004 |
| Lead, total [as Pb] | daily maximum | ≤ 2.74 lb/d | all year | 004 |
| Lead, total [as Pb] | daily maximum | ≤ 4.66 lb/d | all year | 004 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 004 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 004 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 004 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 004 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 004 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 004 |
| Zinc, total [as Zn] | 30-day average | ≤ 1 mg/L | all year | 004 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | 004 |
| Zinc, total [as Zn] | 30-day average | ≤ .83 lb/d | all year | 004 |
| Zinc, total [as Zn] | daily maximum | ≤ 2.5 lb/d | all year | 004 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 004 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 004 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 004 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 004 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | 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 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 004 |
| Temperature, water deg. fahrenheit | monthly maximum | ≤ 93 deg F | all year | 005 |
| pH | daily minimum | ≥ 6 SU | all year | 005 |
| pH | daily maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 005 |
| Solids, total suspended | 30-day average | ≤ 72 lb/d | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 205 lb/d | all year | 005 |
| Oil & Grease | 30-day average | ≤ 15 mg/L | all year | 005 |
| Oil & Grease | daily maximum | ≤ 30 mg/L | all year | 005 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | 30-day average | ≤ 72 lb/d | all year | 005 |
| Oil & Grease | daily maximum | ≤ 205 lb/d | all year | 005 |
| Oil & Grease | daily maximum | ≤ 402 lb/d | all year | 005 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 005 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 005 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 005 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 005 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 005 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 005 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 005 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 005 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 005 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 005 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 005 |
| Chromium, total [as Cr] | 30-day average | ≤ 1 mg/L | all year | 005 |
| Chromium, total [as Cr] | daily maximum | ≤ 2 mg/L | all year | 005 |
| Chromium, total [as Cr] | 30-day average | ≤ .2 lb/d | all year | 005 |
| Chromium, total [as Cr] | daily maximum | ≤ .6 lb/d | all year | 005 |
| Chromium, total [as Cr] | daily maximum | report only (lb/d) | all year | 005 |
| Copper, total [as Cu] | 30-day average | ≤ .5 mg/L | all year | 005 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | 005 |
| Copper, total [as Cu] | 30-day average | ≤ 2.4 lb/d | all year | 005 |
| Copper, total [as Cu] | daily maximum | ≤ 6.8 lb/d | all year | 005 |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year | 005 |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year | 005 |
| Iron, total [as Fe] | 30-day average | ≤ 9.6 lb/d | all year | 005 |
| Iron, total [as Fe] | daily maximum | ≤ 27 lb/d | all year | 005 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 005 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 005 |
| Lead, total [as Pb] | 30-day average | ≤ .2 mg/L | all year | 005 |
| Lead, total [as Pb] | daily maximum | ≤ .4 mg/L | all year | 005 |
| Lead, total [as Pb] | 30-day average | ≤ .961 lb/d | all year | 005 |
| Lead, total [as Pb] | daily maximum | ≤ 2.74 lb/d | all year | 005 |
| Lead, total [as Pb] | daily maximum | ≤ 4.66 lb/d | all year | 005 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 005 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 005 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 005 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 005 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 005 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 005 |
| Zinc, total [as Zn] | 30-day average | ≤ 1 mg/L | all year | 005 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | 005 |
| Zinc, total [as Zn] | 30-day average | ≤ .83 lb/d | all year | 005 |
| Zinc, total [as Zn] | daily maximum | ≤ 2.5 lb/d | all year | 005 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 005 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 005 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 005 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 005 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | 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 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | all year | 005 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 005 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 005 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | all year | 008 |
| Solids, total suspended | quarterly maximum | report only (mg/L) | all year | 008 |
| Oil & Grease | quarterly maximum | report only (mg/L) | all year | 008 |
| Oil & Grease | quarterly maximum | report only (mg/L) | all year | 008 |
| Iron, total [as Fe] | quarterly maximum | report only (mg/L) | all year | 008 |
| Iron, total [as Fe] | quarterly maximum | report only (mg/L) | all year | 008 |
| Zinc, total [as Zn] | quarterly maximum | report only (mg/L) | all year | 008 |
| Zinc, total [as Zn] | quarterly maximum | report only (mg/L) | all year | 008 |
| Flow, in conduit or thru treatment plant | quarterly minimum | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | quarterly minimum | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | quarterly maximum | report only (MGD) | all year | 008 |
| Flow, in conduit or thru treatment plant | quarterly maximum | report only (MGD) | all year | 008 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | A04 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 60 mg/L | all year | A04 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 7.2 lb/d | all year | A04 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 86 lb/d | all year | A04 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | A04 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | A04 |
| Solids, total suspended | 30-day average | ≤ 7.2 lb/d | all year | A04 |
| Solids, total suspended | daily maximum | ≤ 86 lb/d | all year | A04 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | A04 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | A04 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | A04 |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 22 Primary Metal Industries permits in Illinois.
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On EPA ECHO: Facility report · DMR history
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