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Aurora, City of

Water Supply, Aurora, Illinois. NPDES permit IL0067555, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall A01 form 0 monthly (7 values), outfall B01 form 0 monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (12)

ParameterStatisticLimitMonthsOutfall
pHmonthly minimum≥ 6 SUall yearA01
pHmonthly maximum≤ 10 SUall yearA01
Solids, total suspended30-day average≤ 15 mg/Lall yearA01
Solids, total suspendeddaily maximum≤ 30 mg/Lall yearA01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearA01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearA01
Chlorine, total residualdaily maximum≤ .05 mg/Lall yearA01
pHmonthly minimum≥ 6 SUall yearB01
pHmonthly maximum≤ 10 SUall yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Chlorine, total residualdaily maximum≤ .05 mg/Lall yearB01

How strict are these limits?

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/IL0067555 · MCP: https://passage-data.com/mcp