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UNION ELECTRIC d/b/a AMEREN MISSOURI

Electric Services, Venice, Illinois. NPDES permit IL0000175 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 0 monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chlorine, total residual, daily maximum.06 mg/L≤ .05 mg/L20%

Limits in force (10)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all year
pHmonthly minimum≥ 6 SUall year
pHmonthly maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Oil and grease30-day average≤ 15 mg/Lall year
Oil and greasedaily maximum≤ 30 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year

How strict are these limits?

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

Same industry: the 45 Electric Services 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/IL0000175 · MCP: https://passage-data.com/mcp