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Electric Services, Oakwood, Illinois. NPDES permit IL0004057, in force until Nov 30, 2028. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Solids, total suspended, 30-day average | 16.2 mg/L | ≤ 15 mg/L | 8% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | monthly minimum | ≥ 6 SU | all year | 001 |
| pH | monthly maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .9 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.2 mg/L | Jan, Feb, Nov, Dec | 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 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, free [amenable to chlorination] | 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] | 30-day average | ≤ .19 mg/L | all year | 001 |
| Arsenic, total [as As] | daily maximum | ≤ .36 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 |
| Boron, total [as B] | 30-day average | ≤ 7.6 mg/L | all year | 001 |
| Boron, total [as B] | daily maximum | ≤ 40.1 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, 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] | 30-day average | ≤ 2 mg/L | all year | 001 |
| Iron, total [as Fe] | daily maximum | ≤ 4 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 |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year | 001 |
| Thallium, total [as Tl] | daily maximum | report only (ug/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 |
| Antimony, total [as Sb] | daily maximum | report only (ug/L) | all year | 001 |
| Antimony, total [as Sb] | daily maximum | report only (ug/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 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 001 |
| Oil and grease | daily maximum | ≤ 20 mg/L | all year | 001 |
| Radium 226, total | daily maximum | report only (pCi/mL) | all year | 001 |
| Radium 226, total | daily maximum | report only (pCi/mL) | all year | 001 |
| Radium 228, total | daily maximum | report only (pCi/mL) | all year | 001 |
| Radium 228, total | daily maximum | report only (pCi/mL) | 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 |
| Sulfates, total [as SO4] | daily maximum | ≤ 2000 mg/L | all year | 001 |
| Mercury, total [as Hg] | annual average | ≤ 12 ng/L | all year | 001 |
| pH | monthly minimum | ≥ 6 SU | all year | 002 |
| pH | monthly maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 002 |
| Oil and grease | daily maximum | ≤ 20 mg/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 |
| pH | monthly minimum | ≥ 6 SU | all year | 003 |
| pH | monthly maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.5 mg/L | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ .9 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 2.7 mg/L | Jan, Feb, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | Mar, Apr, May, Sep, Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Jun–Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.2 mg/L | Jan, Feb, Nov, Dec | 003 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 003 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 003 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 003 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 003 |
| Arsenic, total [as As] | 30-day average | ≤ .19 mg/L | all year | 003 |
| Arsenic, total [as As] | daily maximum | ≤ .36 mg/L | all year | 003 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 003 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 003 |
| Boron, total [as B] | 30-day average | ≤ 7.6 mg/L | all year | 003 |
| Boron, total [as B] | daily maximum | ≤ 40.1 mg/L | all year | 003 |
| Boron, total [as B] | daily maximum | report only (mg/L) | all year | 003 |
| Boron, total [as B] | daily maximum | report only (mg/L) | all year | 003 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 003 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 003 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 003 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 003 |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year | 003 |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year | 003 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 003 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 003 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 003 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 003 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 003 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 003 |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year | 003 |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year | 003 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 003 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 003 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 003 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 003 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 003 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 003 |
| Antimony, total [as Sb] | daily maximum | report only (ug/L) | all year | 003 |
| Antimony, total [as Sb] | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 003 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 003 |
| Oil and grease | daily maximum | ≤ 20 mg/L | all year | 003 |
| Radium 226, total | daily maximum | report only (pCi/mL) | all year | 003 |
| Radium 226, total | daily maximum | report only (pCi/mL) | all year | 003 |
| Radium 228, total | daily maximum | report only (pCi/mL) | all year | 003 |
| Radium 228, total | daily maximum | report only (pCi/mL) | all year | 003 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | 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 |
| Sulfates, total [as SO4] | daily maximum | ≤ 2000 mg/L | all year | 003 |
| Mercury, total [as Hg] | annual average | ≤ 12 ng/L | all year | 003 |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 45 Electric Services permits in Illinois.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IL0004057 · MCP: https://passage-data.com/mcp