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Electric Services, Cowden, Illinois. NPDES permit IL0074268 expired Aug 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | ≤ 63 deg F | Jan, Feb, Mar, Dec | 001 |
| Temperature, water deg. fahrenheit | monthly maximum | ≤ 93 deg F | Apr–Nov | 001 |
| Temperature, water deg. fahrenheit | monthly maximum | ≤ 5 deg F | all year | 001 |
| 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] | daily maximum | report only (mg/L) | Jun, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | Jun, Dec | 001 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | Jun, Dec | 001 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | Jun, Dec | 001 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 001 |
| Oil and grease | daily maximum | ≤ 20 mg/L | all year | 001 |
| Temperature, length of excursion | total | report only (hr/mo) | all year | 001 |
| Temperature, length of excursion | total | ≤ 88 hr/12mo | 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 |
| pH | monthly minimum | ≥ 6.5 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 |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year | 002 |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year | 002 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 002 |
| Oil and grease | daily maximum | ≤ 30 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 | ≥ 6.5 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 |
| 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 |
| Oil and grease | 30-day average | ≤ 15 mg/L | all year | 003 |
| Oil and grease | daily maximum | ≤ 30 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 |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 45 Electric Services permits in Illinois.
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Your permit document is the final word. As JSON: /api/v1/permits/IL0074268 · MCP: https://passage-data.com/mcp