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Oglesby, City of

Sewage treatment plant, Oglesby, Illinois. NPDES permit IL0024996, in force until Jan 31, 2031. Last 12 months: over a limit 51 times (last August 2026), 4 of 81 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (21 values), outfall 003 form 0 monthly (1 value), outfall 005 form 0 monthly (1 value), outfall A01 form 0 monthly (1 value), outfall B01 form 0 monthly (1 value), outfall C01 form 0 monthly (1 value), and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
37 values over a limit, 0 required values missing, 10 of 96 reports late

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

All 51 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum.92 mg/L≤ .75 mg/L23%
October 2025Coliform, fecal general, daily maximumT≤ 400 #/100mL—
October 2025Nitrogen, ammonia total [as N], daily maximum20.2 mg/L≤ 2.5 mg/L708%
October 2025Nitrogen, ammonia total [as N], daily maximum47.8 lb/d≤ 26 lb/d84%
October 2025Nitrogen, ammonia total [as N], monthly average21.2 lb/d≤ 15 lb/d41%
October 2025Nitrogen, ammonia total [as N], monthly average9.07 mg/L≤ 1.5 mg/L505%
November 2025Nitrogen, ammonia total [as N], daily maximum18.5 mg/L≤ 3.6 mg/L414%
November 2025Nitrogen, ammonia total [as N], daily maximum71.3 lb/d≤ 37 lb/d93%
December 2025BOD, carbonaceous [5 day, 20 C], monthly average29 mg/L≤ 25 mg/L16%
December 2025BOD, carbonaceous [5 day, 20 C], weekly average41 mg/L≤ 40 mg/L3%
December 2025Nitrogen, ammonia total [as N], daily maximum15.5 mg/L≤ 3.6 mg/L331%
December 2025Nitrogen, ammonia total [as N], daily maximum62.6 lb/d≤ 37 lb/d69%
December 2025Solids, total suspended, weekly average52 mg/L≤ 45 mg/L16%
January 2026BOD, carbonaceous [5 day, 20 C], weekly average43 mg/L≤ 40 mg/L8%
January 2026Nitrogen, ammonia total [as N], daily maximum16.2 mg/L≤ 3.6 mg/L350%
January 2026Nitrogen, ammonia total [as N], daily maximum52 lb/d≤ 37 lb/d41%
February 2026Nitrogen, ammonia total [as N], daily maximum20.3 mg/L≤ 3.2 mg/L534%
February 2026Nitrogen, ammonia total [as N], daily maximum55 lb/d≤ 33 lb/d67%
February 2026Nitrogen, ammonia total [as N], monthly average13.3 mg/L≤ 2.3 mg/L478%
February 2026Nitrogen, ammonia total [as N], monthly average36 lb/d≤ 23 lb/d57%
March 2026Nitrogen, ammonia total [as N], daily maximum12.5 mg/L≤ 2.8 mg/L346%
March 2026Nitrogen, ammonia total [as N], daily maximum80.9 lb/d≤ 29 lb/d179%
March 2026Nitrogen, ammonia total [as N], monthly average47.9 lb/d≤ 12 lb/d299%
March 2026Nitrogen, ammonia total [as N], monthly average9.53 mg/L≤ 1.2 mg/L694%
March 2026Oxygen, dissolved [DO], minimum weekly average5.94 mg/L≥ 6.25 mg/L5%
April 2026Nitrogen, ammonia total [as N], daily maximum52.4 lb/d≤ 26 lb/d102%
April 2026Nitrogen, ammonia total [as N], daily maximum8.9 mg/L≤ 2.5 mg/L256%
April 2026Nitrogen, ammonia total [as N], monthly average22 lb/d≤ 12 lb/d83%
April 2026Nitrogen, ammonia total [as N], monthly average3.14 mg/L≤ 1.2 mg/L162%
April 2026Oxygen, dissolved [DO], minimum weekly average6.08 mg/L≥ 6.25 mg/L3%
May 2026Nitrogen, ammonia total [as N], daily maximum40 lb/d≤ 26 lb/d54%
May 2026Nitrogen, ammonia total [as N], daily maximum8.66 mg/L≤ 2.5 mg/L246%
May 2026Nitrogen, ammonia total [as N], monthly average17 lb/d≤ 12 lb/d42%
May 2026Nitrogen, ammonia total [as N], monthly average4.27 mg/L≤ 1.2 mg/L256%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average30 mg/L≤ 25 mg/L20%
June 2026Nitrogen, ammonia total [as N], daily maximum13.2 mg/L≤ 2.5 mg/L428%
June 2026Nitrogen, ammonia total [as N], daily maximum71.2 lb/d≤ 26 lb/d174%
June 2026Nitrogen, ammonia total [as N], monthly average35.5 lb/d≤ 11 lb/d223%
June 2026Nitrogen, ammonia total [as N], monthly average6.57 mg/L≤ 1.1 mg/L497%
July 2026Coliform, fecal general, daily maximum590 #/100mL≤ 400 #/100mL48%
July 2026Nitrogen, ammonia total [as N], daily maximum15.2 mg/L≤ 2.5 mg/L508%
July 2026Nitrogen, ammonia total [as N], daily maximum46.7 lb/d≤ 26 lb/d80%
July 2026Nitrogen, ammonia total [as N], monthly average16.7 lb/d≤ 11 lb/d52%
July 2026Nitrogen, ammonia total [as N], monthly average5.16 mg/L≤ 1.1 mg/L369%
July 2026Oxygen, dissolved [DO], minimum weekly average5.13 mg/L≥ 6.25 mg/L18%
July 2026Solids, total suspended, weekly average50 mg/L≤ 45 mg/L11%
August 2026Coliform, fecal general, daily maximumT≤ 400 #/100mL—
August 2026Nitrogen, ammonia total [as N], daily maximum13.2 mg/L≤ 2.5 mg/L428%
August 2026Nitrogen, ammonia total [as N], daily maximum75 lb/d≤ 26 lb/d188%
August 2026Nitrogen, ammonia total [as N], monthly average37 lb/d≤ 11 lb/d236%
August 2026Nitrogen, ammonia total [as N], monthly average7.94 mg/L≤ 1.1 mg/L622%

Limits in force (45)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimum≥ 6 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 4.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, Dec001
Oxygen, dissolved [DO]minimum weekly average≥ 6.25 mg/LMar–Jul001
Oxygen, dissolved [DO]daily minimum≥ 4 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≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 306 lb/dall year001
Solids, total suspendedweekly average≤ 459 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 2.8 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.5 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 12 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 12 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 23 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 29 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 26 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 33 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 26 lb/dApr, 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≤ .75 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualdaily maximum≤ .75 mg/LMay–Oct001
Coliform, fecal generaldaily maximum≤ 400 #/100mLMay–Oct001
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≤ 255 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 408 lb/dall year001
Overflowsmonthly totalreport only (#/mo)all year003
Overflowsmonthly totalreport only (#/mo)all year005
Overflowsmonthly totalreport only (#/mo)all yearA01
Overflowsmonthly totalreport only (#/mo)all yearB01
Overflowsmonthly totalreport only (#/mo)all yearC01
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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