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Water Supply, Ottawa, Illinois. NPDES permit IL0074098, in force until Aug 31, 2030. Last 12 months: no values over a limit, 4 required values missing, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | monthly minimum | ≥ 6 SU | all year |
| pH | monthly maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 15 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year |
| Chloride [as Cl] | daily maximum | ≤ 500 mg/L | all year |
| Fluoride, total [as F] | 30-day average | report only (mg/L) | Jan, Jul |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | Jan, Jul |
| Radium 226, total | 30-day average | report only (pCi/L) | Mar, Jun, Sep, Dec |
| Radium 226, total | daily maximum | report only (pCi/L) | Mar, Jun, Sep, Dec |
| Radium 228, total | 30-day average | report only (pCi/L) | Mar, Jun, Sep, Dec |
| Radium 228, total | daily maximum | report only (pCi/L) | Mar, Jun, Sep, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
Cited limits by parameter: Illinois's rules and the federal ones.
Same industry: the 30 Water Supply 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/IL0074098 · MCP: https://passage-data.com/mcp