Clean Water Act discharge permit · NPDES IL0021644
CHARLESTON STP, CITY OF, Charleston, IL: NPDES IL0021644 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 13Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CHARLESTON STP, CITY OF, held by CHARLESTON, CITY OF, holds NPDES permit IL0021644, which discharges to Cassell Creek. EPA’s file records it issued June 28, 2011 and expiring July 31, 2016. 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 | CHARLESTON STP, CITY OF |
|---|---|
| Permittee as filed | CHARLESTON, CITY OF |
| NPDES ID | IL0021644 |
| 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 | June 28, 2011 |
| Expiration date | July 31, 2016 |
| Address | Charleston, IL 61920 |
| Receiving water | CASSELL CREEK |
| Subwatershed | Cassell Creek (HUC 051201120602) |
| Program components on file | Biosolids, CSO, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler ILR000192625 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 14Pollutants on file
- 13Under a numeric limit
- 12With 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] | 102 | 41 | 29 | May 31, 2024 | 1,425% over the limit |
| Solids, total suspended | 11 | 28 | 24 | April 30, 2024 | 949% over the limit |
| Coliform, fecal general | 4 | 24 | 23 | August 31, 2023 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 10 | 5 | 5 | July 31, 2022 | 10% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 6 | 2 | July 31, 2020 | 163% over the limit |
| pH | 8 | 1 | 1 | March 31, 2022 | |
| BOD, 5-day, 20 deg. C | 3 | 1 | 1 | July 31, 2020 | 40% over the limit |
| Flow | 1 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 6 | 4 | 0 | ||
| Phosphorus, total [as P] | 4 | 2 | 0 | ||
| Nitrogen, total [as N] | 4 | 1 | 0 | ||
| Zinc, total [as Zn] | 0 | 1 | 0 | ||
| Chlorine, total residual | 4 | 0 | 0 | ||
| Flow, total | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 27, 2026 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| June 17, 2026 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| April 4, 2025 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
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 IL0021644 there.
Nearby on the register
- Discharge permits in Charleston
- Every permit record in Charleston, A to Z
- Discharge permits in Illinois
- Every permit record in Illinois, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.