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Gibson City, City of

Sewage treatment plant, Gibson City, Illinois. NPDES permit IL0023281 expired Jun 30, 2026; its limits still apply. Last 12 months: over a limit 12 times (last August 2026), 8 of 55 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (13 values), outfall A01 form 0 monthly (9 values), outfall B01 form 0 monthly (22 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 12 of 60 reports late

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

Period endingOutfallParameterReportedLimitOver by
April 2026A01Chlorine, total residual, daily maximum2.2 mg/L≤ .75 mg/L193%
April 2026A01Coliform, fecal general, daily maximum5300 #/100mL≤ 400 #/100mL1225%
April 2026A01pH, maximum9.2 SU≤ 9 SU—
April 2026B01BOD, carbonaceous [5 day, 20 C], monthly average10.2 mg/L≤ 10 mg/L2%
June 2026A01Chlorine, total residual, daily maximum1.49 mg/L≤ .75 mg/L99%
June 2026A01Coliform, fecal general, daily maximum7360 #/100mL≤ 400 #/100mL1740%
June 2026B01Nitrogen, ammonia total [as N], daily maximum3.71 mg/L≤ 3 mg/L24%
July 2026A01Chlorine, total residual, daily maximum1.43 mg/L≤ .75 mg/L91%
July 2026B01Nitrogen, ammonia total [as N], daily maximum6.4 mg/L≤ 3 mg/L113%
July 2026B01Nitrogen, ammonia total [as N], monthly average18.85 lb/d≤ 13 lb/d45%
July 2026B01Nitrogen, ammonia total [as N], monthly average4.5 mg/L≤ 1.4 mg/L221%
August 2026A01Coliform, fecal general, daily maximum32000 #/100mL≤ 400 #/100mL7900%

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly averagereport 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
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Chlorine, total residualdaily maximum≤ .75 mg/Lall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Overflowsmonthly totalreport only (#/mo)all year003
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
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearA01
Chlorine, total residualdaily maximum≤ .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≥ 6 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6.25 mg/LMar–JulB01
Oxygen, dissolved [DO]minimum weekly average≥ 4.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
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≤ 115 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 230 lb/dall yearB01
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMarB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 7.1 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 mg/LMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr, May, Sep, OctB01
Nitrogen, ammonia total [as N]monthly average≤ 13 lb/dJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 35 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 14 lb/dMarB01
Nitrogen, ammonia total [as N]monthly average≤ 14 lb/dApr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 29 lb/dJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 68 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 63 lb/dMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 29 lb/dApr, May, Sep, OctB01
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMarB01
Nitrogen, ammonia total [as N]weekly average≤ 36 lb/dMarB01
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all yearB01
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≤ 96 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 192 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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