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Sewage treatment plant, major discharger, Downers Grove, Illinois. NPDES permit IL0028380, in force until Feb 28, 2027. Last 12 months: over a limit once (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| August 2026 | Chlorine, total residual, monthly average | 2.5 mg/L | ≤ .75 mg/L | 233% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | report only (mg/L) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | 002 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 002 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .75 mg/L | all year | 003 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 003 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | A01 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | A01 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | A01 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | A01 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | A01 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | A01 |
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | B01 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | B01 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | B01 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | B01 |
| pH | minimum | ≥ 6 SU | all year | B01 |
| pH | maximum | ≤ 9 SU | all year | B01 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | B01 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | B01 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | B01 |
| Solids, total suspended | monthly average | ≤ 2202 lb/d | all year | B01 |
| Solids, total suspended | daily maximum | ≤ 4404 lb/d | all year | B01 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | B01 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | B01 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Jan | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Apr | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | May | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Dec | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Aug | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Sep | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Feb | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jul | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Nov | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4 mg/L | Mar | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Oct | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Apr | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | May | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Dec | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jun | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Aug | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Sep | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Feb | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Jul | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Nov | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8 mg/L | Mar | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3 mg/L | Oct | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 734 lb/d | Jan | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Apr | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | May | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 734 lb/d | Dec | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Jun | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Aug | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Sep | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 734 lb/d | Feb | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Jul | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 734 lb/d | Nov | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 734 lb/d | Mar | B01 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 275 lb/d | Oct | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1376 lb/d | Jan | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Apr | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | May | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1376 lb/d | Dec | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Jun | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Aug | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Sep | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1376 lb/d | Feb | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Jul | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1376 lb/d | Nov | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1468 lb/d | Mar | B01 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 550 lb/d | Oct | B01 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | B01 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | B01 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | B01 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | B01 |
| Phosphorus, dissolved | monthly average | report only (mg/L) | all year | B01 |
| Phosphorus, dissolved | daily maximum | report only (mg/L) | all year | B01 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | B01 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | B01 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | B01 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | B01 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | B01 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | B01 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | B01 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | B01 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | B01 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | B01 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | B01 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | B01 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | B01 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | B01 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | B01 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | B01 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | B01 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | B01 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | B01 |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | B01 |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | B01 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | B01 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | B01 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | B01 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | B01 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | B01 |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | B01 |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | B01 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | B01 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | B01 |
| Coliform, fecal - % samples exceeding limit | maximum | ≤ 10 % | all year | B01 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | B01 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | B01 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | B01 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | B01 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | May–Oct | B01 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | B01 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | B01 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | B01 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Oct | B01 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | May–Oct | B01 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1835 lb/d | all year | B01 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 3670 lb/d | all year | B01 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | C01 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | C01 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | C01 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | C01 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | C01 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | C01 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | monthly average | report only (mg/L) | all year | INF |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | INF |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | INF |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | INF |
| Oil & Grease | daily maximum | report only (mg/L) | all year | INFL |
| Oil & Grease | daily maximum | report only (mg/L) | all year | INFL |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | INFL |
| Cyanide, weak acid, dissociable | daily maximum | report only (ug/L) | all year | INFL |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | INFL |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | INFL |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | INFL |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | INFL |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | INFL |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | INFL |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | INFL |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | INFL |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | INFL |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | INFL |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | INFL |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | INFL |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | INFL |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | INFL |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | INFL |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | INFL |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | INFL |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | INFL |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | INFL |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | INFL |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | INFL |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | INFL |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | INFL |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | INFL |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | INFL |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | INFL |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | INFL |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | INFL |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | INFL |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | INFL |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | INFL |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | INFL |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | INFL |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | INFL |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | INFL |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | INFL |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | INFL |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | INFL |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | INFL |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | INFL |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | INFL |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | INFL |
Cited limits by parameter: Illinois's rules and the federal ones.
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