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Aurora, City of

Sewage treatment plant, Aurora, Illinois. NPDES permit IL0048518 expired Jul 31, 2026; its limits still apply. Last 12 months: over a limit once (last July 2026), 3 of 176 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, 0 of 191 reports late

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

Period endingParameterReportedLimitOver by
July 2026Coliform, fecal general, daily maximum1720 #/100mL≤ 400 #/100mL330%

Limits in force (24)

ParameterStatisticLimitMonthsOutfall
Overflowsmonthly totalreport only (#/mo)all year001
Overflowsmonthly totalreport only (#/mo)all year002
Overflowsmonthly totalreport only (#/mo)all year004
Overflowsmonthly totalreport only (#/mo)all year005
Overflowsmonthly totalreport only (#/mo)all year008
Overflowsmonthly totalreport only (#/mo)all year010
Overflowsmonthly totalreport only (#/mo)all year015
Overflowsmonthly totalreport only (#/mo)all year017
Overflowsmonthly totalreport only (#/mo)all year018
Overflowsmonthly totalreport only (#/mo)all year021
Overflowsmonthly totalreport only (#/mo)all year022
Overflowsmonthly totalreport only (#/mo)all year023
Overflowsmonthly totalreport only (#/mo)all year025
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year027
pHminimum≥ 6 SUall year027
pHmaximum≤ 9 SUall year027
Solids, total suspendedmonthly averagereport only (mg/L)all year027
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year027
Phosphorus, total [as P]daily maximumreport only (mg/L)all year027
Chlorine, total residualmonthly average≤ .75 mg/Lall year027
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year027
Flow, totalmonthly totalreport only (Mgal/mo)all year027
Overflowsmonthly totalreport only (#/mo)all yearA03
Overflowsmonthly totalreport only (#/mo)all yearA16

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0048518 · MCP: https://passage-data.com/mcp