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United Regional Water Cooperative

Water Supply, Illiopolis, Illinois. NPDES permit IL0080162, in force until Apr 30, 2031. Last 12 months: over a limit once (last February 2026), 5 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 25 days after each period: form 0 monthly (9 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 2 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
February 2026	Solids, total suspended, 30-day average	17.2 mg/L	≤ 15 mg/L	15%

Limits in force (9)

Parameter	Statistic	Limit	Months
pH	monthly minimum	≥ 6.5 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
Iron, total [as Fe]	30-day average	≤ 2 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 4 mg/L	all year
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
Chlorine, total residual	daily maximum	≤ .05 mg/L	all year

How strict are these limits?

Iron, total [as Fe], 30-day average 2 mg/L — stricter than 45% of 121 other minor industrial and other permits in Illinois; 54% have the same limit
Iron, total [as Fe], daily maximum 4 mg/L — stricter than 44% of 124 other minor industrial and other permits in Illinois; 52% have the same limit
pH, monthly minimum at least 6.5 SU — stricter than 38% of 286 other minor industrial and other permits in Illinois; 61% have the same limit

Cited limits by parameter: Illinois's rules and the federal ones.

Same industry: the 30 Water Supply permits in Illinois.

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Your permit document is the final word. As JSON: /api/v1/permits/IL0080162 · MCP: https://passage-data.com/mcp