Clean Water Act discharge permit · NPDES IL0031615
WALNUT STP, VILLAGE OF, Walnut, IL: NPDES IL0031615 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
WALNUT STP, VILLAGE OF, held by WALNUT, VILLAGE OF, holds NPDES permit IL0031615, which discharges to Walnut Creek. EPA’s file records it issued April 25, 2019 and expiring April 30, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | WALNUT STP, VILLAGE OF |
|---|---|
| Permittee as filed | WALNUT, VILLAGE OF |
| NPDES ID | IL0031615 |
| 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 | April 25, 2019 |
| Expiration date | April 30, 2024 |
| Address | Walnut, IL 61376 |
| Receiving water | WALNUT CREEK |
| Subwatershed | Walnut Creek (HUC 070900070206) |
| Program components on file | Biosolids, POTW |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 9Pollutants on file
- 9Under a numeric limit
- 8With a violation of any kind
- 4With 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] | 28 | 46 | 16 | July 31, 2016 | 583% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 84 | 12 | December 31, 2007 | 90% over the limit |
| Solids, total suspended | 9 | 95 | 8 | July 31, 2020 | 67% over the limit |
| pH | 4 | 39 | 3 | March 31, 2026 | |
| Flow, in conduit or thru treatment plant | 6 | 66 | 0 | ||
| Chlorine, total residual | 2 | 20 | 0 | ||
| BOD, 5-day, 20 deg. C | 1 | 15 | 0 | ||
| Oxygen, dissolved [DO] | 10 | 9 | 0 | ||
| Coliform, fecal general | 2 | 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 IL0031615.
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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- One watershed — $2,990/year
- One state — $4,990/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 IL0031615 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.