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Fairfield, City of

Sewage treatment plant, Fairfield, Illinois. NPDES permit IL0020605, in force until Aug 31, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (21 values), outfall INF form L monthly (4 values)
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (73)

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≤ 220 lb/dall year001
Solids, total suspendeddaily maximum≤ 440 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.8 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 73 lb/dJan001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dJun001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dAug001
Nitrogen, ammonia total [as N]monthly average≤ 73 lb/dDec001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dSep001
Nitrogen, ammonia total [as N]monthly average≤ 73 lb/dFeb001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dJul001
Nitrogen, ammonia total [as N]monthly average≤ 51 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 28 lb/dOct001
Nitrogen, ammonia total [as N]monthly average≤ 73 lb/dNov001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 147 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 147 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 147 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 147 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 55 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 147 lb/dNov001
Nitrogen, ammonia total [as N]weekly average≤ 7 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 128 lb/dMar001
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≤ 10 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 183 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 367 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/IL0020605 · MCP: https://passage-data.com/mcp