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Illinois American Water - Washington Estates

Sewerage Systems, Washington, Illinois. NPDES permit IL0047406, in force until Jan 31, 2030. Last 12 months: no values over a limit, 4 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (12 values), outfall A01 form 0 monthly (7 values), outfall B01 form 0 monthly (21 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 48 reports late

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)all year001
Oxygen, dissolved [DO]minimum weekly averagereport only (mg/L)all year001
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearA01
pHminimum≥ 6 SUall yearA01
pHmaximum≤ 9 SUall yearA01
Solids, total suspendedmonthly averagereport only (mg/L)all yearA01
Chlorine, total residualmonthly average≤ .75 mg/Lall yearA01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 9 SUall yearB01
Solids, total suspendedmonthly average≤ 12 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 24 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 30 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 60 lb/dall yearB01
Nitrogen, ammonia total [as N]monthly average≤ .9 mg/LApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 3.4 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 4.2 mg/LMarB01
Nitrogen, ammonia total [as N]monthly average≤ 2.3 lb/dApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 8.5 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 lb/dApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 11 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 11 lb/dMarB01
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMarB01
Nitrogen, ammonia total [as N]weekly average≤ 9.5 lb/dMarB01
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
Coliform, fecal generaldaily maximumreport only (#/100mL)May–OctB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 50 lb/dall yearB01
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/IL0047406 · MCP: https://passage-data.com/mcp