Clean Water Act discharge permit · NPDES IL0027723
THORN CREEK BASIN SD STP, Chicago Heights, IL: NPDES IL0027723 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
THORN CREEK BASIN SD STP holds NPDES permit IL0027723, which discharges to Thorn Creek. EPA’s file records it issued September 30, 2010 and expiring September 30, 2015. 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 | THORN CREEK BASIN SD STP |
|---|---|
| Permittee as filed | THORN CREEK BASIN SD STP |
| NPDES ID | IL0027723 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 30, 2010 |
| Expiration date | September 30, 2015 |
| Address | Chicago Heights, IL 60411 |
| Receiving water | THORN CREEK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Thorn Creek (HUC 071200030204) |
| Other EPA IDs (FRS) | RCRA handler ILD000666156 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 20Pollutants on file
- 15Under a numeric limit
- 13With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 4 | 24 | 18 | February 28, 2019 | 5,644% over the limit |
| Solids, total suspended | 12 | 16 | 11 | March 31, 2022 | 225% over the limit |
| Nitrogen, ammonia total [as N] | 108 | 21 | 8 | April 30, 2022 | 419% over the limit |
| Chlorine, total residual | 5 | 8 | 4 | May 31, 2021 | 1,640% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 8 | 4 | April 30, 2023 | 50% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 5 | 3 | March 31, 2022 | 259% over the limit |
| pH | 6 | 7 | 1 | May 31, 2010 | |
| Chloride | 2 | 1 | 1 | February 28, 2021 | 55% over the limit |
| Sulfate, total [as SO4] | 0 | 1 | 1 | September 30, 2008 | 2% over the limit |
| Pollutant table from 503.13 | 0 | 2 | 0 | ||
| Level of pathogen requirements achieved | 0 | 2 | 0 | ||
| Description of pathogen option used | 0 | 2 | 0 | ||
| Vector attraction reduction alternative used | 0 | 2 | 0 | ||
| Sulfate | 16 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Flow | 2 | 0 | 0 | ||
| Flow, total | 1 | 0 | 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 IL0027723.
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.
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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 IL0027723 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.