Clean Water Act discharge permit · NPDES IL0045641
SOUTHWESTERN SENIOR HIGH SCHOOL STP, Piasa, IL: NPDES IL0045641 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
SOUTHWESTERN SENIOR HIGH SCHOOL STP, held by SOUTHWESTERN SENIOR HIGH SCHOOL, holds NPDES permit IL0045641, which discharges to Unnamed Trib To Piasa Creek. EPA’s file records it issued June 29, 2017 and expiring June 30, 2022. 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 | SOUTHWESTERN SENIOR HIGH SCHOOL STP |
|---|---|
| Permittee as filed | SOUTHWESTERN SENIOR HIGH SCHOOL |
| NPDES ID | IL0045641 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Biosolids |
| Issued | June 29, 2017 |
| Expiration date | June 30, 2022 |
| Address | Piasa, IL 62079 |
| Receiving water | UNNAMED TRIB TO PIASA CREEK |
| Subwatershed | Upper Piasa Creek (HUC 071100090201) |
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
- 7With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 18 | 358 | 342 | May 31, 2026 | 12,685% over the limit |
| Solids, total suspended | 5 | 138 | 122 | February 28, 2026 | 1,917% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 104 | 92 | February 28, 2026 | 314% over the limit |
| Oxygen, dissolved [DO] | 5 | 16 | 9 | April 30, 2026 | 62% over the limit |
| Chlorine, total residual | 1 | 8 | 2 | February 28, 2015 | 17,900% over the limit |
| pH | 2 | 8 | 1 | October 31, 2017 | |
| Coliform, fecal general | 1 | 4 | 1 | March 31, 2003 | 1,900% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 14 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 4 | 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 IL0045641.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, IL0045641.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 IL0045641 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.