Passage Data · Check a report · Use it from your AI
Sewage treatment plant, major discharger, O'fallon, Illinois. NPDES permit IL0021636, in force until Mar 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 5.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 4 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Mar–Jul | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3.5 mg/L | Jan, Feb, Aug, Sep, Oct, Nov, Dec | 001 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 5 mg/L | Mar–Jul | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 12 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 24 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 1461 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 2922 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 | ≤ 1.5 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.8 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.4 mg/L | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 183 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 183 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 231 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 950 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 950 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 536 lb/d | Jan, Feb, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3.8 mg/L | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.8 mg/L | Mar, Apr, May, Sep, Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 463 lb/d | Jun–Aug | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 584 lb/d | Mar, Apr, May, Sep, Oct | 001 |
| Phosphorus, total [as P] | monthly average | ≤ .5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 61 lb/d | 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] | monthly average | ≤ .069 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 |
| Zinc, total [as Zn] | monthly average | ≤ 7.6 lb/d | 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 |
| Coliform, fecal - % samples exceeding limit | maximum | ≤ 10 % | May–Oct | 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 | geometric mean | ≤ 200 #/100mL | May–Oct | 001 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | May–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 20 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1218 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | daily maximum | ≤ 2435 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 |
| 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.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IL0021636 · MCP: https://passage-data.com/mcp