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Aqua Illinois

Sewage treatment plant, Grant Park, Illinois. NPDES permit IL0050717 expired Oct 31, 2026. Last 12 months: over a limit once (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (17 values), outfall D01 form 0 monthly (9 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 9 of 36 reports late

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

Period endingParameterReportedLimitOver by
June 2026Coliform, fecal general, daily maximum2419.6 #/100mL≤ 400 #/100mL505%

Limits in force (32)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–Jul001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 235 lb/dall year001
Solids, total suspendedweekly average≤ 353 lb/dall year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .05 mg/Lall year001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 196 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 314 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall yearD01
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall yearD01
pHminimum≥ 6 SUall yearD01
pHmaximum≤ 9 SUall yearD01
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD01
Solids, total suspendedweekly average≤ 45 mg/Lall yearD01
Chlorine, total residualmonthly average≤ .75 mg/Lall yearD01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearD01
Flow, totalmonthly totalreport only (Mgal/mo)all yearD01
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINF
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF

How strict are these limits?

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/IL0050717 · MCP: https://passage-data.com/mcp