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Metropolitan Water Reclamation District of Greater Chicago

Sewage treatment plant, major discharger, Chicago, Illinois. NPDES permit IL0036340 expired Dec 31, 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 (34 values), outfall A01 form 0 monthly (22 values), outfall B01 form 0 monthly (74 values), outfall INF form L monthly (14 values), outfall B01 form A yearly, outfall INFL form A yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 62 reports late

Limits in force (266)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly average minimumreport only (mg/L)all year001
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]minimum weekly averagereport only (mg/L)all year001
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
pHminimum≥ 6 SUall year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all year001
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all year001
Carbon, tot organic [TOC]weekly averagereport only (mg/L)all year001
Carbon, tot organic [TOC]weekly averagereport only (mg/L)all year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Chlorine, total residualmonthly average≤ .75 mg/Lall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
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. Cmonthly averagereport only (mg/L)all yearA01
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearA01
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearA01
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all yearA01
Solids, total suspendedmonthly averagereport only (mg/L)all yearA01
Solids, total suspendedmonthly averagereport only (mg/L)all yearA01
Solids, total suspendeddaily maximumreport only (mg/L)all yearA01
Solids, total suspendeddaily maximumreport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearA01
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearA01
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearA01
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearA01
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearA01
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all yearA01
Carbon, tot organic [TOC]daily maximumreport only (mg/L)all yearA01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearA01
Coliform, fecal generaldaily maximum≤ 400 #/100mLall yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Flow, totalmonthly totalreport only (Mgal/mo)all yearA01
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all yearB01
Temperature, water deg. fahrenheitmonthly maximumreport only (deg F)all yearB01
Oxygen, dissolved [DO]monthly average minimum≥ 5.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
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≥ 6 mg/LMar–JulB01
Oxygen, dissolved [DO]minimum weekly average≥ 4 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
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≥ 5 mg/LMar–JulB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
Oxygen, dissolved [DO]daily minimum≥ 3.5 mg/LJan, Feb, Aug, Sep, Oct, Nov, DecB01
pHminimum≥ 6 SUall yearB01
pHminimum≥ 6 SUall yearB01
pHmaximum≤ 9 SUall yearB01
pHmaximum≤ 9 SUall yearB01
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all yearB01
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all yearB01
Solids, total suspendedmonthly average≤ 12 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 12 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 24 mg/Lall yearB01
Solids, total suspendeddaily maximum≤ 24 mg/Lall yearB01
Solids, total suspendedmonthly average≤ 5004 lb/dall yearB01
Solids, total suspendedmonthly average≤ 5004 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 10008 lb/dall yearB01
Solids, total suspendeddaily maximum≤ 10008 lb/dall yearB01
Oil & Greasedaily maximumreport only (mg/L)all yearB01
Oil & Greasedaily maximumreport only (mg/L)all yearB01
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearB01
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearB01
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearB01
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearB01
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LMarB01
Nitrogen, ammonia total [as N]monthly average≤ 2.3 mg/LMarB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 1.5 mg/LApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 3.6 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 3 mg/LApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 8 mg/LJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 959 lb/dMarB01
Nitrogen, ammonia total [as N]monthly average≤ 959 lb/dMarB01
Nitrogen, ammonia total [as N]monthly average≤ 626 lb/dApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 626 lb/dApr–OctB01
Nitrogen, ammonia total [as N]monthly average≤ 1501 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]monthly average≤ 1501 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 3336 lb/dMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 3336 lb/dMarB01
Nitrogen, ammonia total [as N]daily maximum≤ 1251 lb/dApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 1251 lb/dApr–OctB01
Nitrogen, ammonia total [as N]daily maximum≤ 3336 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]daily maximum≤ 3336 lb/dJan, Feb, Nov, DecB01
Nitrogen, ammonia total [as N]weekly average≤ 5.7 mg/LMarB01
Nitrogen, ammonia total [as N]weekly average≤ 5.7 mg/LMarB01
Nitrogen, ammonia total [as N]weekly average≤ 2377 lb/dMarB01
Nitrogen, ammonia total [as N]weekly average≤ 2377 lb/dMarB01
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearB01
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all yearB01
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearB01
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all yearB01
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearB01
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearB01
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearB01
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearB01
Phosphorus, dissolveddaily maximumreport only (mg/L)all yearB01
Phosphorus, dissolveddaily maximumreport only (mg/L)all yearB01
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all yearB01
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all yearB01
Carbon, tot organic [TOC]weekly averagereport only (mg/L)all yearB01
Carbon, tot organic [TOC]weekly averagereport only (mg/L)all yearB01
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearB01
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearB01
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearB01
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearB01
Chloride [as Cl]daily maximumreport only (mg/L)all yearB01
Chloride [as Cl]daily maximumreport only (mg/L)all yearB01
Fluoride, total [as F]daily maximumreport only (mg/L)all yearB01
Fluoride, total [as F]daily maximumreport only (mg/L)all yearB01
Arsenic, total [as As]daily maximumreport only (mg/L)all yearB01
Arsenic, total [as As]daily maximumreport only (mg/L)all yearB01
Barium, total [as Ba]daily maximumreport only (mg/L)all yearB01
Barium, total [as Ba]daily maximumreport only (mg/L)all yearB01
Beryllium, total [as Be]daily maximumreport only (mg/L)all yearB01
Beryllium, total [as Be]daily maximumreport only (mg/L)all yearB01
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearB01
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearB01
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearB01
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearB01
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearB01
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearB01
Copper, total [as Cu]daily maximumreport only (mg/L)all yearB01
Copper, total [as Cu]daily maximumreport only (mg/L)all yearB01
Iron, total [as Fe]daily maximumreport only (mg/L)all yearB01
Iron, total [as Fe]daily maximumreport only (mg/L)all yearB01
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearB01
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearB01
Lead, total [as Pb]daily maximumreport only (mg/L)all yearB01
Lead, total [as Pb]daily maximumreport only (mg/L)all yearB01
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearB01
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearB01
Thallium, total [as Tl]daily maximumreport only (mg/L)all yearB01
Thallium, total [as Tl]daily maximumreport only (mg/L)all yearB01
Nickel, total [as Ni]monthly average≤ .013 mg/Lall yearB01
Nickel, total [as Ni]monthly average≤ .013 mg/Lall yearB01
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearB01
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearB01
Nickel, total [as Ni]monthly average≤ 5.4 lb/dall yearB01
Nickel, total [as Ni]monthly average≤ 5.4 lb/dall yearB01
Silver, total [as Ag]daily maximumreport only (mg/L)all yearB01
Silver, total [as Ag]daily maximumreport only (mg/L)all yearB01
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearB01
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearB01
Antimony, total [as Sb]daily maximumreport only (mg/L)all yearB01
Antimony, total [as Sb]daily maximumreport only (mg/L)all yearB01
Selenium, total [as Se]daily maximumreport only (mg/L)all yearB01
Selenium, total [as Se]daily maximumreport only (mg/L)all yearB01
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–OctB01
Coliform, fecal - % samples exceeding limitmaximum≤ 10 %May–OctB01
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearB01
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearB01
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctB01
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctB01
Chlorine, total residualdaily maximum≤ .038 mg/LJan, Feb, Mar, Apr, Nov, DecB01
Chlorine, total residualdaily maximum≤ .038 mg/LJan, Feb, Mar, Apr, Nov, DecB01
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearB01
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearB01
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–OctB01
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–OctB01
Coliform, fecal generaldaily maximumreport only (#/100mL)May–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]monthly average≤ 10 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 20 mg/Lall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4170 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4170 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8340 lb/dall yearB01
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 8340 lb/dall yearB01
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L)all yearINF
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearINF
Nitrogen, total [as N]daily maximumreport only (mg/L)all yearINF
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearINF
Phosphorus, total [as P]daily maximumreport only (mg/L)all yearINF
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all yearINF
Carbon, tot organic [TOC]monthly averagereport only (mg/L)all yearINF
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINF
Oil & Greasedaily maximumreport only (mg/L)all yearINFL
Oil & Greasedaily maximumreport only (mg/L)all yearINFL
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearINFL
Cyanide, total [as CN]daily maximumreport only (ug/L)all yearINFL
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearINFL
Cyanide, free [amenable to chlorination]daily maximumreport only (ug/L)all yearINFL
Fluoride, total [as F]daily maximumreport only (mg/L)all yearINFL
Fluoride, total [as F]daily maximumreport only (mg/L)all yearINFL
Arsenic, total [as As]daily maximumreport only (mg/L)all yearINFL
Arsenic, total [as As]daily maximumreport only (mg/L)all yearINFL
Barium, total [as Ba]daily maximumreport only (mg/L)all yearINFL
Barium, total [as Ba]daily maximumreport only (mg/L)all yearINFL
Beryllium, total [as Be]daily maximumreport only (mg/L)all yearINFL
Beryllium, total [as Be]daily maximumreport only (mg/L)all yearINFL
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearINFL
Cadmium, total [as Cd]daily maximumreport only (mg/L)all yearINFL
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearINFL
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all yearINFL
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearINFL
Chromium, total [as Cr]daily maximumreport only (mg/L)all yearINFL
Copper, total [as Cu]daily maximumreport only (mg/L)all yearINFL
Copper, total [as Cu]daily maximumreport only (mg/L)all yearINFL
Iron, total [as Fe]daily maximumreport only (mg/L)all yearINFL
Iron, total [as Fe]daily maximumreport only (mg/L)all yearINFL
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearINFL
Iron, dissolved [as Fe]daily maximumreport only (mg/L)all yearINFL
Lead, total [as Pb]daily maximumreport only (mg/L)all yearINFL
Lead, total [as Pb]daily maximumreport only (mg/L)all yearINFL
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearINFL
Manganese, total [as Mn]daily maximumreport only (mg/L)all yearINFL
Thallium, total [as Tl]daily maximumreport only (mg/L)all yearINFL
Thallium, total [as Tl]daily maximumreport only (mg/L)all yearINFL
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearINFL
Nickel, total [as Ni]daily maximumreport only (mg/L)all yearINFL
Silver, total [as Ag]daily maximumreport only (mg/L)all yearINFL
Silver, total [as Ag]daily maximumreport only (mg/L)all yearINFL
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearINFL
Zinc, total [as Zn]daily maximumreport only (mg/L)all yearINFL
Antimony, total [as Sb]daily maximumreport only (mg/L)all yearINFL
Antimony, total [as Sb]daily maximumreport only (mg/L)all yearINFL
Selenium, total [as Se]daily maximumreport only (mg/L)all yearINFL
Selenium, total [as Se]daily maximumreport only (mg/L)all yearINFL
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearINFL
Phenolics, total recoverabledaily maximumreport only (mg/L)all yearINFL
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearINFL
Mercury, total [as Hg]daily maximumreport only (ng/L)all yearINFL

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/IL0036340 · MCP: https://passage-data.com/mcp