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Sewage treatment plant, major discharger, Sterling, Illinois. NPDES permit IL0060569 expired Sep 30, 2024; its limits still apply. Last 12 months: over a limit 5 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, total suspended, monthly average | 34 mg/L | ≤ 25 mg/L | 36% |
| January 2026 | Solids, total suspended, monthly average | 1903 lb/d | ≤ 1877 lb/d | 1% |
| January 2026 | Solids, total suspended, monthly average | 42 mg/L | ≤ 25 mg/L | 68% |
| January 2026 | Solids, total suspended, weekly average | 50 mg/L | ≤ 45 mg/L | 11% |
| February 2026 | Solids, total suspended, monthly average | 38 mg/L | ≤ 25 mg/L | 52% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 40 mg/L | all year | 001 |
| 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 |
| 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 |
| Temperature, water deg. fahrenheit | monthly maximum | report only (deg F) | all year | 002 |
| Specific conductance | daily maximum | report only (uS/cm) | all year | 002 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | minimum weekly average | report only (mg/L) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 1877 lb/d | all year | 002 |
| Solids, total suspended | weekly average | ≤ 3378 lb/d | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate 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 |
| Phosphorus, dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, total [as CN] | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide, free [amenable to chlorination] | daily maximum | report only (ug/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 002 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 002 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 002 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 002 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 002 |
| Barium, total [as Ba] | daily maximum | report only (mg/L) | all year | 002 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 002 |
| Cadmium, total [as Cd] | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 002 |
| Chromium, total [as Cr] | daily maximum | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 002 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 002 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 002 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 002 |
| Iron, dissolved [as Fe] | daily maximum | report only (mg/L) | all year | 002 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 002 |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year | 002 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 002 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 002 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 002 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 002 |
| Selenium, total [as Se] | daily maximum | report only (mg/L) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Phenolics, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | May–Oct | 002 |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 002 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Oct | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 20 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 1501 lb/d | all year | 002 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 3002 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Coliform, fecal general | daily maximum | report only (#/100mL) | all year | 003 |
| Flow | monthly total | report only (#/mo) | all year | 003 |
| 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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/IL0060569 · MCP: https://passage-data.com/mcp