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Sewage treatment plant, major discharger, Alton, Illinois. NPDES permit IL0027464 expired May 31, 2024; its limits still apply. Last 12 months: over a limit 5 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| April 2026 | Chlorine, total residual, daily maximum | 1.56 mg/L | ≤ .75 mg/L | 108% |
| May 2026 | Coliform, fecal general, daily maximum | > 2419.6 #/100mL | ≤ 400 #/100mL | — |
| June 2026 | Chlorine, total residual, daily maximum | 1.64 mg/L | ≤ .75 mg/L | 119% |
| July 2026 | Coliform, fecal general, daily maximum | > 2419.6 #/100mL | ≤ 400 #/100mL | — |
| August 2026 | Coliform, fecal general, daily maximum | 1553.4 #/100mL | ≤ 400 #/100mL | 288% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | 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 | ≤ 5473 lb/d | all year | 001 |
| Solids, total suspended | weekly average | ≤ 9852 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] | monthly average | 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 | 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 |
| 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 | ≤ .75 mg/L | May–Oct | 001 |
| Chlorine, total residual | daily maximum | ≤ .75 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 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 | ≤ 4379 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 8757 lb/d | all year | 001 |
| Overflows | monthly total | report only (#/mo) | all year | 002 |
| Overflows | monthly total | report only (#/mo) | all year | 003 |
| Overflows | monthly total | report only (#/mo) | all year | 004 |
| Overflows | monthly total | report only (#/mo) | all year | 007 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 009 |
| pH | minimum | ≥ 6 SU | all year | 009 |
| pH | maximum | ≤ 9 SU | all year | 009 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | all year | 009 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 009 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 009 |
| Solids, total suspended | monthly average | ≤ 5473 lb/d | all year | 009 |
| Solids, total suspended | weekly average | ≤ 9852 lb/d | all year | 009 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 009 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 009 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | Jun–Aug | 009 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | Mar, Apr, May, Sep, Oct | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.3 mg/L | Jan, Feb, Nov, Dec | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.7 mg/L | Jun–Aug | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 4.8 mg/L | Mar, Apr, May, Sep, Oct | 009 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 416 lb/d | Jun–Aug | 009 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 547 lb/d | Mar, Apr, May, Sep, Oct | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1379 lb/d | Jan, Feb, Nov, Dec | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1467 lb/d | Jun–Aug | 009 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 1051 lb/d | Mar, Apr, May, Sep, Oct | 009 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.8 mg/L | Jun–Aug | 009 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 1051 lb/d | Jun–Aug | 009 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 009 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 009 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 009 |
| Chlorine, total residual | daily maximum | ≤ .75 mg/L | May–Oct | 009 |
| Chlorine, total residual | daily maximum | ≤ .75 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 009 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 009 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 009 |
| Flow | monthly total | report only (#/mo) | all year | 009 |
| Effluent dilution ratio | minimum | ≥ 500 % | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 4379 lb/d | all year | 009 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 8757 lb/d | all year | 009 |
| 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 |
Cited limits by parameter: Illinois's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/IL0027464 · MCP: https://passage-data.com/mcp