Clean Water Act discharge permit · NPDES IL0073890
THOMSON STP, VILLAGE OF, Thomson, IL: NPDES IL0073890 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
THOMSON STP, VILLAGE OF, held by THOMSON, VILLAGE OF, holds NPDES permit IL0073890, which discharges to Backwater Trib To Mississippi River. EPA’s file records it issued January 8, 2018 and expiring January 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | THOMSON STP, VILLAGE OF |
|---|---|
| Permittee as filed | THOMSON, VILLAGE OF |
| NPDES ID | IL0073890 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 8, 2018 |
| Expiration date | January 31, 2023 |
| Address | Thomson, IL 61285 |
| Receiving water | BACKWATER TRIB TO MISSISSIPPI RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Deer Creek-Mississippi River (HUC 070600051203) |
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
- 5With 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] | 14 | 47 | 43 | May 31, 2026 | 3,493% over the limit |
| Solids, total suspended | 5 | 33 | 32 | October 31, 2025 | 4,733% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 18 | 18 | May 31, 2025 | 420% over the limit |
| Coliform, fecal general | 1 | 11 | 11 | August 31, 2023 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 5 | 8 | 8 | April 30, 2022 | 50% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 4 | 0 | ||
| pH | 2 | 2 | 0 | ||
| Chlorine, total residual | 2 | 2 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 1 | 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 IL0073890.
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
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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 IL0073890 there.
Nearby on the register
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- Every permit record in Thomson, A to Z
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- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.