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Omaha, Village of

Sewage treatment plant, Omaha, Illinois. NPDES permit IL0080076, in force until Dec 31, 2030. Last 12 months: over a limit 15 times (last August 2026), 6 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (23 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 24 of 24 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal general, daily maximum1800 #/100mL≤ 400 #/100mL350%
October 2025Solids, total suspended, monthly average23 mg/L≤ 12 mg/L92%
November 2025Solids, total suspended, daily maximum29 mg/L≤ 24 mg/L21%
November 2025Solids, total suspended, monthly average29 mg/L≤ 12 mg/L142%
December 2025Solids, total suspended, daily maximum27 mg/L≤ 24 mg/L13%
December 2025Solids, total suspended, monthly average27 mg/L≤ 12 mg/L125%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average17 mg/L≤ 10 mg/L70%
May 2026Coliform, fecal general, daily maximum18900 #/100mL≤ 400 #/100mL4625%
June 2026Chlorine, total residual, daily maximum8.4 mg/L≤ .05 mg/L16700%
June 2026Nitrogen, ammonia total [as N], monthly average3.7 mg/L≤ 1.5 mg/L147%
July 2026Coliform, fecal general, daily maximum20000 #/100mL≤ 400 #/100mL4900%
July 2026Nitrogen, ammonia total [as N], monthly average2 mg/L≤ 1.5 mg/L33%
August 2026Nitrogen, ammonia total [as N], monthly average5.04 mg/L≤ 1.5 mg/L236%
August 2026Nitrogen, ammonia total [as N], weekly average5.04 mg/L≤ 3.8 mg/L33%
August 2026Oxygen, dissolved [DO], monthly average minimum5.1 mg/L≥ 5.5 mg/L7%

Limits in force (40)

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≤ 3.2 lb/dall year001
Solids, total suspendeddaily maximum≤ 6.4 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 9.6 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 7.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ .56 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ .4 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 2.6 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 5.3 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 1 lb/dJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 1.4 lb/dMar, Apr, May, Sep, Oct001
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/LMay–Oct001
Chlorine, total residualdaily maximum≤ .05 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Coliform, fecal generaldaily maximum≤ 400 #/100mLMay–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≤ 2.7 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5.3 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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