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Sewerage Systems, Rockford, Illinois. NPDES permit ILS000001, in force until Apr 30, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | semi-annual maximum | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | semi-annual maximum | report only (mg/L) | all year | 001 |
| pH | semi-annual minimum | report only (SU) | all year | 001 |
| pH | semi-annual maximum | report only (SU) | all year | 001 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Cadmium, total [as Cd] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | semi-annual maximum | report only (mg/L) | all year | 001 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ng/L) | all year | 001 |
| Coliform, fecal general | semi-annual maximum | report only (#/100mL) | all year | 001 |
| Chemical Oxygen Demand [COD] | semi-annual maximum | report only (mg/L) | all year | 001 |
| Temperature, water deg. centigrade | semi-annual maximum | report only (deg C) | all year | 002 |
| BOD, 5-day, 20 deg. C | semi-annual maximum | report only (mg/L) | all year | 002 |
| pH | semi-annual minimum | report only (SU) | all year | 002 |
| pH | semi-annual maximum | report only (SU) | all year | 002 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Cadmium, total [as Cd] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Solids, total dissolved | semi-annual maximum | report only (mg/L) | all year | 002 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ng/L) | all year | 002 |
| Coliform, fecal general | semi-annual maximum | report only (#/100mL) | all year | 002 |
| Chemical Oxygen Demand [COD] | semi-annual maximum | report only (mg/L) | all year | 002 |
| Temperature, water deg. centigrade | semi-annual maximum | report only (deg C) | all year | 003 |
| BOD, 5-day, 20 deg. C | semi-annual maximum | report only (mg/L) | all year | 003 |
| pH | semi-annual minimum | report only (SU) | all year | 003 |
| pH | semi-annual maximum | report only (SU) | all year | 003 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | 003 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Cadmium, total [as Cd] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Copper, total [as Cu] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | semi-annual maximum | report only (mg/L) | all year | 003 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ng/L) | all year | 003 |
| Coliform, fecal general | semi-annual maximum | report only (#/100mL) | all year | 003 |
| Chemical Oxygen Demand [COD] | semi-annual maximum | report only (mg/L) | all year | 003 |
| Temperature, water deg. centigrade | semi-annual maximum | report only (deg C) | all year | 004 |
| BOD, 5-day, 20 deg. C | semi-annual maximum | report only (mg/L) | all year | 004 |
| pH | semi-annual minimum | report only (SU) | all year | 004 |
| pH | semi-annual maximum | report only (SU) | all year | 004 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | 004 |
| Nitrogen, total [as N] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Nitrogen, Kjeldahl, total [as N] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Cadmium, total [as Cd] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Copper, total [as Cu] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Solids, total dissolved | semi-annual maximum | report only (mg/L) | all year | 004 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ng/L) | all year | 004 |
| Coliform, fecal general | semi-annual maximum | report only (#/100mL) | all year | 004 |
| Chemical Oxygen Demand [COD] | semi-annual maximum | report only (mg/L) | all year | 004 |
| Temperature, water deg. centigrade | semi-annual maximum | report only (deg C) | all year | 005 |
| BOD, 5-day, 20 deg. C | semi-annual maximum | report only (mg/L) | all year | 005 |
| pH | semi-annual minimum | report only (SU) | all year | 005 |
| pH | semi-annual maximum | report only (SU) | all year | 005 |
| Solids, total suspended | semi-annual maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | semi-annual maximum | report only (mg/L) | all year | 005 |
| Nitrogen, total [as N] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Nitrogen, Kjeldahl, total [as N] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Phosphorus, total [as P] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Hardness, total [as CaCO3] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Cadmium, total [as Cd] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Copper, total [as Cu] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Lead, total [as Pb] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Zinc, total [as Zn] | semi-annual maximum | report only (mg/L) | all year | 005 |
| Solids, total dissolved | semi-annual maximum | report only (mg/L) | all year | 005 |
| Mercury, total [as Hg] | semi-annual maximum | report only (ng/L) | all year | 005 |
| Coliform, fecal general | semi-annual maximum | report only (#/100mL) | all year | 005 |
| Chemical Oxygen Demand [COD] | semi-annual maximum | report only (mg/L) | all year | 005 |
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/ILS000001 · MCP: https://passage-data.com/mcp