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Sullivan, City of

Sewage treatment plant, Sullivan, Illinois. NPDES permit IL0021806, in force until Feb 28, 2027. Last 12 months: over a limit 11 times (last May 2026), 4 of 44 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (10 values), outfall A01 form 0 monthly (9 values), outfall B01 form 0 monthly (29 values), outfall INF form L monthly (4 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingOutfallParameterReportedLimitOver by
April 2026001Coliform, fecal general, daily maximum700 #/100mL≤ 400 #/100mL75%
April 2026001Solids, total suspended, monthly average47 mg/L≤ 30 mg/L57%
April 2026001Solids, total suspended, weekly average47 mg/L≤ 45 mg/L4%
April 2026A01Coliform, fecal general, daily maximum1400 #/100mL≤ 400 #/100mL250%
April 2026B01Oxygen, dissolved [DO], minimum weekly average5.7 mg/L≥ 6 mg/L5%
May 2026001Coliform, fecal general, daily maximum500 #/100mL≤ 400 #/100mL25%
May 2026A01Coliform, fecal general, daily maximum500 #/100mL≤ 400 #/100mL25%
May 2026B01Coliform, fecal - % samples exceeding limit, maximum12.5 %≤ 10 %25%
May 2026B01Nitrogen, ammonia total [as N], daily maximum3.6 mg/L≤ 3 mg/L20%
May 2026B01Nitrogen, ammonia total [as N], monthly average3 mg/L≤ 1.5 mg/L100%
May 2026B01Phosphorus, total [as P], monthly average1.4 mg/L≤ 1 mg/L40%

Limits in force (64)

ParameterStatisticLimitMonthsOutfall
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]daily maximumreport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year001
Flow, totalmonthly totalreport only (MGD)all year001
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
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearA01
Chlorine, total residualmonthly average≤ .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≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]minimum weekly average≥ 6 mg/LMar–JulB01
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 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≤ 100 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 200 lb/dall yearB01
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearB01
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 6.9 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 13 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]monthly average≤ 13 lb/dJun–AugB01
Nitrogen, ammonia total [as N]monthly average≤ 18 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dMar, Apr, May, Sep, OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 33 lb/dJun–AugB01
Nitrogen, ammonia total [as N]daily maximum≤ 58 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]weekly average≤ 5.3 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]weekly average≤ 44 lb/dJan, Feb, Nov, DecB01
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearB01
Phosphorus, total [as P]daily maximum≤ 2 mg/Lall yearB01
Phosphorus, total [as P]monthly average≤ 8.3 lb/dall yearB01
Phosphorus, total [as P]daily maximum≤ 17 lb/dall yearB01
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–OctB01
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 generalgeometric mean≤ 200 #/100mLMay–OctB01
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≤ 83 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 167 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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