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Electric Services, major discharger, Romeoville, Illinois. NPDES permit IL0002208, in force until Nov 30, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | ≤ 73 deg F | Jan, Feb | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 78 deg F | Mar, Dec | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 83 deg F | Apr | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 88 deg F | May, Nov | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 96 deg F | Jun–Sep | 001 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 93 deg F | Oct | 001 |
| pH | monthly minimum | ≥ 6 SU | all year | 001 |
| pH | monthly maximum | ≤ 9 SU | 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 |
| Month excursion time [min] | year-to-date total | ≤ 438 hr/mo | 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 & Grease | 30-day average | ≤ 15 mg/L | all year | 002 |
| Oil & 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 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 60 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 3.7 lb/d | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 18 lb/d | all year | 003 |
| pH | monthly minimum | ≥ 6 SU | all year | 003 |
| pH | monthly maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 3.7 lb/d | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 18 lb/d | 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 | daily maximum | ≤ .05 mg/L | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | A01 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | A01 |
| Oil & Grease | annual average | ≤ 15 mg/L | Dec | A01 |
| Oil & Grease | annual maximum | ≤ 30 mg/L | Dec | 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 |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year | B01 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | B01 |
| Oil & Grease | annual average | ≤ 15 mg/L | Dec | B01 |
| Oil & Grease | annual maximum | ≤ 20 mg/L | Dec | B01 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | B01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | B01 |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 45 Electric Services permits in Illinois.
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