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Thorn Creek Basin SD

Sewage treatment plant, major discharger, Chicago Heights, Illinois. NPDES permit IL0027723 expired Sep 30, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form 0 monthly (31 values), outfall A01 form 0 monthly (9 values), outfall INF form L monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 60 reports late

Limits in force (103)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimumreport 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
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≤ 4028 lb/dall year001
Solids, total suspendeddaily maximum≤ 8056 lb/dall year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 1.7 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LNov001
Nitrogen, ammonia total [as N]monthly average≤ 1.8 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 604 lb/dMay001
Nitrogen, ammonia total [as N]monthly average≤ 906 lb/dMar001
Nitrogen, ammonia total [as N]monthly average≤ 1343 lb/dFeb001
Nitrogen, ammonia total [as N]monthly average≤ 571 lb/dJul001
Nitrogen, ammonia total [as N]monthly average≤ 604 lb/dSep001
Nitrogen, ammonia total [as N]monthly average≤ 571 lb/dJun001
Nitrogen, ammonia total [as N]monthly average≤ 571 lb/dAug001
Nitrogen, ammonia total [as N]monthly average≤ 604 lb/dApr001
Nitrogen, ammonia total [as N]monthly average≤ 1343 lb/dDec001
Nitrogen, ammonia total [as N]monthly average≤ 1343 lb/dJan001
Nitrogen, ammonia total [as N]monthly average≤ 1343 lb/dNov001
Nitrogen, ammonia total [as N]monthly average≤ 604 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dMay001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dMar001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dJul001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dSep001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dJun001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dAug001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dApr001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dDec001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dJan001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dNov001
Nitrogen, ammonia total [as N]daily maximum≤ 2685 lb/dOct001
Nitrogen, ammonia total [as N]weekly average≤ 6.8 mg/LMar001
Nitrogen, ammonia total [as N]weekly average≤ 7.3 mg/LApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 4.3 mg/LJun–Aug001
Nitrogen, ammonia total [as N]weekly average≤ 2283 lb/dMar001
Nitrogen, ammonia total [as N]weekly average≤ 2451 lb/dApr, May, Sep, Oct001
Nitrogen, ammonia total [as N]weekly average≤ 1443 lb/dJun–Aug001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–Oct001
Chloridedaily maximum≤ 500 mg/Lall year001
Chloridedaily maximum≤ 167843 lb/dall year001
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≤ .038 mg/LMay–Oct001
Chlorine, total residualdaily maximum≤ .038 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Oct001
Coliform, fecal generaldaily maximumreport only (#/100mL)May–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≤ 3357 lb/dall year001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 6714 lb/dall year001
Sulfatedaily maximum≤ 2116 mg/LJan, Feb, Mar, Nov, Dec001
Sulfatedaily maximum≤ 2116 mg/LApr–Oct001
Sulfatedaily maximum≤ 621689 lb/dJan, Feb, Mar, Nov, Dec001
Sulfatedaily maximum≤ 624374 lb/dApr–Oct001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Coliform, fecal generaldaily maximumreport only (#/100mL)all year002
Flowmonthly totalreport only (#/mo)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year003
Solids, total suspendeddaily maximumreport only (mg/L)all year003
Coliform, fecal generaldaily maximumreport only (#/100mL)all year003
Flowmonthly totalreport only (#/mo)all year003
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall yearA01
pHminimum≥ 6 SUall yearA01
pHmaximum≤ 9 SUall yearA01
Solids, total suspendedmonthly average≤ 30 mg/Lall yearA01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Chlorine, total residualmonthly average≤ .75 mg/Lall yearA01
Coliform, fecal generalmonthly average≤ 400 #/100mLall yearA01
Coliform, fecal generaldaily maximum≤ 800 #/100mLall yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0027723 · MCP: https://passage-data.com/mcp