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Gray And Ductile Iron Foundries, major discharger, Mapleton, Illinois. NPDES permit IL0001830 expired Jan 31, 2023; its limits still apply. Last 12 months: over a limit 4 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Solids, total suspended, 30-day average | < 15.64 mg/L | ≤ 15 mg/L | 4% |
| October 2025 | Solids, total suspended, 30-day average | < 3.69 lb/d | ≤ 2.85 lb/d | 29% |
| October 2025 | Solids, total suspended, daily maximum | 120 mg/L | ≤ 30 mg/L | 300% |
| October 2025 | Solids, total suspended, daily maximum | 27.47 lb/d | ≤ 7.18 lb/d | 283% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | Jan, Apr, Jul, Oct | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | 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 | daily maximum | ≤ .05 mg/L | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 006 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 006 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 006 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 006 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 006 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 006 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 006 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 006 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 006 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 006 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 006 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 006 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 006 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 006 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 006 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 006 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 006 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 006 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 006 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 006 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 006 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 006 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 006 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 006 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 006 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 006 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 006 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 006 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 006 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 006 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 006 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 006 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 006 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 006 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 006 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 006 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 006 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 006 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 007 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 007 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 007 |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | 007 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 007 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 007 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 007 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 007 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 007 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 007 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 007 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 007 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 007 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 007 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 007 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 007 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 007 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 007 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 007 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 007 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 007 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 007 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 007 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 007 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 007 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 007 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 007 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 007 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 007 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 007 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 007 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 007 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 007 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 007 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 007 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 007 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 007 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 007 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 007 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 007 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 007 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 007 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 20 mg/L | all year | A01 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 40 mg/L | all year | A01 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 121 lb/d | all year | A01 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 242 lb/d | all year | A01 |
| pH | monthly minimum | ≥ 6 SU | all year | A01 |
| pH | monthly maximum | ≤ 9 SU | all year | A01 |
| Solids, total suspended | 30-day average | ≤ 25 mg/L | all year | A01 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | A01 |
| Solids, total suspended | 30-day average | ≤ 151 lb/d | all year | A01 |
| Solids, total suspended | daily maximum | ≤ 302 lb/d | all year | A01 |
| Nitrogen, ammonia total [as N] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | A01 |
| Nitrogen, ammonia total [as N] | quarterly maximum | report only (mg/L) | Mar, Jun, Sep, Dec | A01 |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .1 mg/L | all year | A01 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ .3 mg/L | all year | A01 |
| Chromium, hexavalent [as Cr] | 30-day average | ≤ .5 lb/d | all year | A01 |
| Chromium, hexavalent [as Cr] | daily maximum | ≤ 1 lb/d | all year | A01 |
| Chromium, total [as Cr] | 30-day average | ≤ 1 mg/L | all year | A01 |
| Chromium, total [as Cr] | daily maximum | ≤ 2 mg/L | all year | A01 |
| Chromium, total [as Cr] | 30-day average | ≤ 5 lb/d | all year | A01 |
| Chromium, total [as Cr] | daily maximum | ≤ 10 lb/d | all year | A01 |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year | A01 |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year | A01 |
| Iron, total [as Fe] | 30-day average | ≤ 10 lb/d | all year | A01 |
| Iron, total [as Fe] | daily maximum | ≤ 20 lb/d | all year | A01 |
| Zinc, total [as Zn] | 30-day average | ≤ 1 mg/L | all year | A01 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | A01 |
| Zinc, total [as Zn] | 30-day average | ≤ 5 lb/d | all year | A01 |
| Zinc, total [as Zn] | daily maximum | ≤ 10 lb/d | all year | A01 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | A01 |
| Oil and grease | daily maximum | ≤ 30 mg/L | all year | A01 |
| Oil and grease | 30-day average | ≤ 60 lb/d | all year | A01 |
| Oil and grease | daily maximum | ≤ 120 lb/d | all year | A01 |
| Phenol | 30-day average | ≤ .3 mg/L | all year | A01 |
| Phenol | daily maximum | ≤ .6 mg/L | all year | A01 |
| Phenol | 30-day average | ≤ 1.2 lb/d | all year | A01 |
| Phenol | daily maximum | ≤ 2.4 lb/d | all year | A01 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | A01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | A01 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | A01 |
| pH | monthly minimum | ≥ 6 SU | all year | C01 |
| pH | monthly maximum | ≤ 9 SU | all year | C01 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | C01 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | C01 |
| Solids, total suspended | 30-day average | ≤ 2.85 lb/d | all year | C01 |
| Solids, total suspended | daily maximum | ≤ 7.18 lb/d | all year | C01 |
| Copper, total [as Cu] | 30-day average | ≤ .5 mg/L | all year | C01 |
| Copper, total [as Cu] | daily maximum | ≤ 1 mg/L | all year | C01 |
| Copper, total [as Cu] | 30-day average | ≤ .03 lb/d | all year | C01 |
| Copper, total [as Cu] | daily maximum | ≤ .05 lb/d | all year | C01 |
| Lead, total [as Pb] | 30-day average | ≤ .2 mg/L | all year | C01 |
| Lead, total [as Pb] | daily maximum | ≤ .4 mg/L | all year | C01 |
| Lead, total [as Pb] | 30-day average | ≤ .05 lb/d | all year | C01 |
| Lead, total [as Pb] | daily maximum | ≤ .1 lb/d | all year | C01 |
| Zinc, total [as Zn] | 30-day average | ≤ 1 mg/L | all year | C01 |
| Zinc, total [as Zn] | daily maximum | ≤ 2 mg/L | all year | C01 |
| Zinc, total [as Zn] | 30-day average | ≤ .07 lb/d | all year | C01 |
| Zinc, total [as Zn] | daily maximum | ≤ .19 lb/d | all year | C01 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | C01 |
| Oil and grease | daily maximum | ≤ 30 mg/L | all year | C01 |
| Oil and grease | 30-day average | ≤ 1.89 lb/d | all year | C01 |
| Oil and grease | daily maximum | ≤ 5.67 lb/d | all year | C01 |
| Phenol | 30-day average | ≤ .3 mg/L | all year | C01 |
| Phenol | daily maximum | ≤ .6 mg/L | all year | C01 |
| Phenol | 30-day average | ≤ .06 lb/d | all year | C01 |
| Phenol | daily maximum | ≤ .16 lb/d | all year | C01 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | C01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | C01 |
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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