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Illinois American Water Company

Sewerage Systems, Lockport, Illinois. NPDES permit IL0045993, in force until Dec 31, 2026. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (25 values), outfall INF form L monthly (4 values)
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingParameterReportedLimitOver by
April 2026Nitrogen, ammonia total [as N], daily maximum4.25 mg/L≤ 2.7 mg/L57%

Limits in force (42)

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≤ 12 mg/Lall year001
Solids, total suspendeddaily maximum≤ 24 mg/Lall year001
Solids, total suspendedmonthly average≤ 266 lb/dall year001
Solids, total suspendeddaily maximum≤ 531 lb/dall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 2.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 1.8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 27 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 6.6 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 49 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 60 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 40 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 71 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ .8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 18 lb/dJun–Aug001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–Oct001
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/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .05 mg/LMay–Oct001
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Oct001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 221 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 443 lb/dall year001
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/IL0045993 · MCP: https://passage-data.com/mcp