Clean Water Act discharge permit · NPDES ILG551034
INTERSTATE I-55 NORTHBOUND WWTP, Springfield, IL: NPDES ILG551034 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
INTERSTATE I-55 NORTHBOUND WWTP, held by ILLINOIS DEPARTMENT OF TRANSPORTATION, holds NPDES permit ILG551034, which discharges to Unnamed Trib Of Sangamon River. EPA’s file records it issued May 6, 2014 and expiring June 30, 2018. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | INTERSTATE I-55 NORTHBOUND WWTP |
|---|---|
| Permittee as filed | ILLINOIS DEPARTMENT OF TRANSPORTATION |
| NPDES ID | ILG551034 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 6, 2014 |
| Expiration date | June 30, 2018 |
| Address | Springfield, IL 62704 |
| Receiving water | UNNAMED TRIB OF SANGAMON RIVER |
| Subwatershed | Little Wolf Creek-Wolf Creek (HUC 071300080102) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 9Under a numeric limit
- 9With a violation of any kind
- 2With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, carbonaceous [5 day, 20 C] | 4 | 149 | 37 | January 31, 2010 | 46% over the limit |
| Solids, total suspended | 5 | 170 | 7 | July 31, 2023 | 49% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 126 | 0 | ||
| pH | 2 | 63 | 0 | ||
| Chlorine, total residual | 1 | 29 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 27 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 3 | 0 | ||
| Coliform, fecal general | 1 | 3 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES ILG551034.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID ILG551034 there.
Nearby on the register
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.