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Auburn, City of

Sewage treatment plant, Auburn, Illinois. NPDES permit IL0022403, in force until Mar 31, 2029. Last 12 months: over a limit 11 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (20 values), outfall INF form L monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
9 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
November 2025Phosphorus, total [as P], daily maximum14.15 lb/d≤ 12.6 lb/d12%
December 2025Phosphorus, total [as P], daily maximum23.5 lb/d≤ 12.6 lb/d87%
January 2026Phosphorus, total [as P], daily maximum14.31 lb/d≤ 12.6 lb/d14%
February 2026Phosphorus, total [as P], daily maximum16.35 lb/d≤ 12.6 lb/d30%
March 2026Phosphorus, total [as P], daily maximum38.96 lb/d≤ 12.6 lb/d209%
March 2026Solids, total suspended, monthly average316.76 lb/d≤ 309 lb/d3%
March 2026Solids, total suspended, weekly average556.04 lb/d≤ 375 lb/d48%
April 2026Phosphorus, total [as P], daily maximum16.65 lb/d≤ 12.6 lb/d32%
May 2026Phosphorus, total [as P], daily maximum13.11 lb/d≤ 12.6 lb/d4%
June 2026Phosphorus, total [as P], daily maximum15.06 lb/d≤ 12.6 lb/d20%
August 2026Phosphorus, total [as P], daily maximum14.97 lb/d≤ 12.6 lb/d19%

Limits in force (26)

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≤ 37 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 309 lb/dall year001
Solids, total suspendedweekly average≤ 375 lb/dall year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Phosphorus, total [as P]daily maximum≤ 12.6 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≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 209 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 334 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

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/IL0022403 · MCP: https://passage-data.com/mcp