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Sewage treatment plant, major discharger, Galesburg, Illinois. NPDES permit IL0023141 expired Aug 31, 2025; its limits still apply. Last 12 months: over a limit 4 times (last March 2026), 4 required values missing, 1 of 460 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 2.2 mg/L | ≤ 2 mg/L | 10% |
| February 2026 | BOD, carbonaceous [5 day, 20 C], monthly average | 11 mg/L | ≤ 10 mg/L | 10% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 2.7 mg/L | ≤ 2.6 mg/L | 4% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 2.2 mg/L | ≤ 2 mg/L | 10% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Overflows | monthly total | report only (#/mo) | all year | 001 |
| Overflows | monthly total | report only (#/mo) | all year | 003 |
| Overflows | monthly total | report only (#/mo) | all year | 005 |
| Overflows | monthly total | report only (#/mo) | all year | 006 |
| Overflows | monthly total | report only (#/mo) | all year | 007 |
| Overflows | monthly total | report only (#/mo) | all year | 008 |
| Overflows | monthly total | report only (#/mo) | all year | 009 |
| Overflows | monthly total | report only (#/mo) | all year | 010 |
| Overflows | monthly total | report only (#/mo) | all year | 012 |
| Overflows | monthly total | report only (#/mo) | all year | 013 |
| Overflows | monthly total | report only (#/mo) | all year | 014 |
| Overflows | monthly total | report only (#/mo) | all year | 015 |
| Overflows | monthly total | report only (#/mo) | all year | 017 |
| Overflows | monthly total | report only (#/mo) | all year | 018 |
| Overflows | monthly total | report only (#/mo) | all year | 019 |
| Overflows | monthly total | report only (#/mo) | all year | 020 |
| Overflows | monthly total | report only (#/mo) | all year | 021 |
| Overflows | monthly total | report only (#/mo) | all year | 022 |
| Overflows | monthly total | report only (#/mo) | all year | 023 |
| Overflows | monthly total | report only (#/mo) | all year | 024 |
| Overflows | monthly total | report only (#/mo) | all year | 025 |
| Overflows | monthly total | report only (#/mo) | all year | 028 |
| Overflows | monthly total | report only (#/mo) | all year | 030 |
| Overflows | monthly total | report only (#/mo) | all year | 031 |
| Overflows | monthly total | report only (#/mo) | all year | 032 |
| Overflows | monthly total | report only (#/mo) | all year | 033 |
| Overflows | monthly total | report only (#/mo) | all year | 034 |
| Overflows | monthly total | report only (#/mo) | all year | 035 |
| Overflows | monthly total | report only (#/mo) | all year | 037 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 042 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 042 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 042 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 042 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 042 |
| pH | minimum | ≥ 6 SU | all year | 042 |
| pH | maximum | ≤ 9 SU | all year | 042 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 042 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 042 |
| Solids, total suspended | monthly average | ≤ 2802 lb/d | all year | 042 |
| Solids, total suspended | daily maximum | ≤ 5604 lb/d | all year | 042 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 042 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 042 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Feb | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Mar, Apr, May, Sep, Oct | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Jul | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Nov | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Dec | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.8 mg/L | Jan | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Feb | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.7 mg/L | Mar, Apr, May, Sep, Oct | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.4 mg/L | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.4 mg/L | Jul | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Dec | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jan | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 607 lb/d | Feb | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 467 lb/d | Mar, Apr, May, Sep, Oct | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 350 lb/d | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 327 lb/d | Jul | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 327 lb/d | Nov | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 467 lb/d | Dec | 042 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 654 lb/d | Jan | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1962 lb/d | Feb | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1331 lb/d | Mar, Apr, May, Sep, Oct | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1495 lb/d | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1495 lb/d | Jul | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1962 lb/d | Nov | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1962 lb/d | Dec | 042 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1962 lb/d | Jan | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.8 mg/L | Jul | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.8 mg/L | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4 mg/L | Mar, Apr, May, Sep, Oct | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 887 lb/d | Jul | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 887 lb/d | Jun, Aug | 042 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 934 lb/d | Mar, Apr, May, Sep, Oct | 042 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 042 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 042 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 042 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | all year | 042 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | all year | 042 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 042 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 042 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 042 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 042 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 042 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 042 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | 042 |
| Beryllium, total [as Be] | daily maximum | report only (mg/L) | all year | 042 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 042 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 042 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 042 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 042 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 042 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 042 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 042 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 042 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 042 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 042 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 042 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 042 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 042 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 042 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 042 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 042 |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | 042 |
| Thallium, total [as Tl] | daily maximum | report only (mg/L) | all year | 042 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 042 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 042 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 042 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 042 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 042 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 042 |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | 042 |
| Antimony, total [as Sb] | daily maximum | report only (mg/L) | all year | 042 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 042 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 042 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 042 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 042 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 042 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 042 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | 042 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 042 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 042 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 042 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 042 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 042 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 2335 lb/d | all year | 042 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 4670 lb/d | all year | 042 |
| Overflows | monthly total | report only (#/mo) | all year | 043 |
| Overflows | monthly total | report only (#/mo) | all year | 047 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 066 |
| pH | minimum | ≥ 6 SU | all year | 066 |
| pH | maximum | ≤ 9 SU | all year | 066 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 066 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 066 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 066 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 066 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 067 |
| pH | minimum | ≥ 6 SU | all year | 067 |
| pH | maximum | ≤ 9 SU | all year | 067 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 067 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 067 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 067 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 067 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 068 |
| pH | minimum | ≥ 6 SU | all year | 068 |
| pH | maximum | ≤ 9 SU | all year | 068 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 068 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 068 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 068 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 068 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 069 |
| pH | minimum | ≥ 6 SU | all year | 069 |
| pH | maximum | ≤ 9 SU | all year | 069 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 069 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 069 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 069 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 069 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 070 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 070 |
| pH | minimum | ≥ 6 SU | all year | 070 |
| pH | maximum | ≤ 9 SU | all year | 070 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 070 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 070 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 070 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 070 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 070 |
| Chlorine, total residual | monthly average | ≤ 1 mg/L | all year | 070 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 070 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 070 |
| 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 |
| 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, 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 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/L) | all year | INFL |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (mg/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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