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Illinois American Water Company

Sewage treatment plant, Villa Grove, Illinois. NPDES permit IL0059005, in force until May 31, 2030. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (27 values), outfall 003 form 0 monthly (13 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingOutfallParameterReportedLimitOver by
March 2026003Coliform, fecal general, daily maximum> 2419.6 #/100mL≤ 400 #/100mL—
April 2026001Nitrogen, ammonia total [as N], daily maximum5.2 mg/L≤ 4.7 mg/L11%
June 2026003Coliform, fecal general, daily maximum2419.6 #/100mL≤ 400 #/100mL505%

Limits in force (62)

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≤ 120 lb/dall year001
Solids, total suspendeddaily maximum≤ 240 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 14 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 14 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 47 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 71 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 47 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 68 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 4.3 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 38 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 43 lb/dMar001
Nitrogen, ammonia total [as N]weekly average≤ 43 lb/dApr, May, Sep, Oct001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]daily maximum≤ 2 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 10 lb/dall year001
Phosphorus, total [as P]daily maximum≤ 20 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)all year001
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≤ 100 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 200 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year003
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 30 mg/Lall year003
Solids, total suspendedweekly average≤ 45 mg/Lall year003
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year003
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year003
Phosphorus, total [as P]monthly averagereport only (mg/L)all year003
Phosphorus, total [as P]daily maximumreport only (mg/L)all year003
Chlorine, total residualmonthly average≤ .75 mg/Lall year003
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year003
Flow, totalmonthly totalreport only (Mgal/mo)all year003
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/IL0059005 · MCP: https://passage-data.com/mcp