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Water Supply, Grand Ridge, Illinois. NPDES permit IL0079235, in force until Mar 31, 2027. Last 12 months: no values over a limit, 3 of 12 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 |
| Nitrogen, ammonia total [as N] | 30-day average | ≤ 1.1 mg/L | May |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.2 mg/L | May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.8 mg/L | May |
| Arsenic, total [as As] | 30-day average | ≤ .25 mg/L | May |
| Arsenic, total [as As] | daily maximum | ≤ .5 mg/L | May |
| Iron, total [as Fe] | 30-day average | ≤ 2 mg/L | all year |
| Iron, total [as Fe] | daily maximum | ≤ 4 mg/L | all year |
| Manganese, total [as Mn] | 30-day average | ≤ 1 mg/L | May |
| Manganese, total [as Mn] | daily maximum | ≤ 2 mg/L | May |
| 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/IL0079235 · MCP: https://passage-data.com/mcp