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Sewage treatment plant, major discharger, Wilmington, Illinois. NPDES permit IL0026085, in force until May 31, 2031. Last 12 months: over a limit 2 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 4.91 mg/L | ≤ 2.8 mg/L | 75% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 5.21 mg/L | ≤ 2.8 mg/L | 86% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 001 |
| 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 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 688 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 1238 lb/d | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.8 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .8 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.9 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 77 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 36 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 36 lb/d | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 22 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77 lb/d | Mar | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 77 lb/d | Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 80 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1.9 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 52 lb/d | Jun–Aug | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 28 lb/d | all year | 001 |
| Phosphorus, dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 001 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .038 mg/L | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | 001 |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | 001 |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | 001 |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | 001 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 550 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 1101 lb/d | all year | 001 |
| PFAS Sum | daily maximum | report only (ng/L) | all year | 001 |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | 001 |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | 001 |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | 001 |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | 001 |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/g) | all year | BIO |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/g) | all year | BIO |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/g) | all year | BIO |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/g) | all year | BIO |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/g) | all year | BIO |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/g) | all year | BIO |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/g) | all year | BIO |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/g) | all year | BIO |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/g) | all year | BIO |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/g) | all year | BIO |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/g) | all year | BIO |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/g) | all year | BIO |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/g) | all year | BIO |
| PFAS Sum | daily maximum | report only (ng/g) | all year | BIO |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/g) | all year | BIO |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/g) | all year | BIO |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/g) | all year | BIO |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/g) | all year | BIO |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/g) | all year | BIO |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/g) | all year | BIO |
| 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 |
| Phosphorus, total [as P] | monthly average | 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 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | INF |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | INF |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | INF |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year | INF |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | report only (ng/L) | all year | INF |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | INF |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | INF |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | INF |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | INF |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | INF |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | INF |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | INF |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | INF |
| PFAS Sum | daily maximum | report only (ng/L) | all year | INF |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | INF |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | INF |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | INF |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | INF |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | INF |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | INF |
Cited limits by parameter: Illinois's rules and the federal ones.
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