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Shelbyville, City of

Sewage treatment plant, Shelbyville, Illinois. NPDES permit IL0021890, in force until Sep 30, 2029. Last 12 months: over a limit 14 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (23 values), outfall 002 form 0 monthly (7 values), outfall 003 form 0 monthly (7 values), outfall 004 form 0 monthly (7 values), outfall 005 form 0 monthly (1 value), outfall A04 form 0 monthly (1 value), and 1 more form
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 1 required value missing, 1 of 84 reports late

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

All 14 values over a limit
Period endingOutfallParameterReportedLimitOver by
November 2025003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
February 2026001Nitrogen, ammonia total [as N], daily maximum8.45 mg/L≤ 6.3 mg/L34%
March 2026002Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
March 2026002pH, maximum9.02 SU≤ 9 SU—
March 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
April 2026001Nitrogen, ammonia total [as N], daily maximum4.87 mg/L≤ 4.6 mg/L6%
April 2026001Nitrogen, ammonia total [as N], monthly average1.65 mg/L≤ 1.5 mg/L10%
April 2026001Nitrogen, ammonia total [as N], weekly average4.87 mg/L≤ 3.8 mg/L28%
April 2026002Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
April 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
May 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
June 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
July 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—
August 2026003Coliform, fecal general, daily maximum> 400 #/100mL≤ 400 #/100mL—

Limits in force (63)

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≤ 500 lb/dall year001
Solids, total suspendedweekly average≤ 751 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 1.2 mg/LJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 4.6 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 5 mg/LJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 25 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]monthly average≤ 20 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 67 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 100 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 83 lb/dJun–Aug001
Nitrogen, ammonia total [as N]daily maximum≤ 105 lb/dJan, Feb, Nov, Dec001
Nitrogen, ammonia total [as N]weekly average≤ 3.8 mg/LMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 63 lb/dMar, Apr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 50 lb/dJun–Aug001
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≤ .5 mg/LJan, Feb, Mar, Apr, Nov, Dec001
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≤ 417 lb/dall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 667 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Chlorine, total residualmonthly average≤ .75 mg/Lall year002
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year002
Flow, totalmonthly totalreport only (Mgal/mo)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year003
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendedmonthly averagereport only (mg/L)all year003
Chlorine, total residualmonthly average≤ .75 mg/Lall year003
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year003
Flow, totalmonthly totalreport only (Mgal/mo)all year003
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year004
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Chlorine, total residualmonthly average≤ .75 mg/Lall year004
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year004
Flow, totalmonthly totalreport only (Mgal/mo)all year004
Overflowsmonthly totalreport only (#/mo)all year005
Overflowsmonthly totalreport only (#/mo)all yearA04
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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