Clean Water Act discharge permit · NPDES MO0058343
ST CHARLES-MISSISSIPPI RIVER WWTF, St. Charles, MO: NPDES MO0058343 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 23Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ST CHARLES-MISSISSIPPI RIVER WWTF, held by City of St. Charles, holds NPDES permit MO0058343, which discharges to Mississippi River. EPA’s file records it issued July 7, 2015 and expiring June 30, 2020. 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 | ST CHARLES-MISSISSIPPI RIVER WWTF |
|---|---|
| Permittee as filed | City of St. Charles |
| NPDES ID | MO0058343 |
| 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 | July 7, 2015 |
| Expiration date | June 30, 2020 |
| Address | St. Charles, MO 63301 |
| Receiving water | Mississippi River |
| Subwatershed | Bolter Island-Mississippi River (HUC 071100090107) |
| Program components on file | Biosolids, POTW, Pretreatment |
| 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
- 34Pollutants on file
- 23Under a numeric limit
- 28With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 88 | 4 | January 31, 2011 | 60% over the limit |
| E. coli | 2 | 42 | 4 | June 30, 2019 | 99,999% over the limit |
| Solids, settleable | 0 | 40 | 2 | June 30, 2011 | 400% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 51 | 1 | January 31, 2026 | 3% over the limit |
| BOD, 5-day, percent removal | 0 | 1 | 1 | January 31, 2026 | 21% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 162 | 0 | ||
| Chlorine, total residual | 0 | 143 | 0 | ||
| Copper, total recoverable | 2 | 140 | 0 | ||
| Coliform, fecal general | 0 | 72 | 0 | ||
| CBOD5+NH3-N | 0 | 68 | 0 | ||
| pH | 2 | 56 | 0 | ||
| Cyanide, total recoverable | 2 | 20 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 16 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 6 | 0 | ||
| Arsenic, total recoverable | 2 | 4 | 0 | ||
| Nickel, total recoverable | 2 | 4 | 0 | ||
| Silver total recoverable | 2 | 4 | 0 | ||
| Zinc, total recoverable | 2 | 4 | 0 | ||
| Lead, total recoverable | 2 | 4 | 0 | ||
| Mercury, total recoverable | 2 | 4 | 0 | ||
| Cadmium, total recoverable | 0 | 4 | 0 | ||
| Chromium, total recoverable | 0 | 4 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 4 | 0 | ||
| E. coli, colony forming units [CFU] | 0 | 2 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 0 | 2 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 1 | 0 | ||
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Phosphorus, total [as P] | 4 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Chromium, trivalent total recoverable | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 3, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| December 18, 2023 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| June 20, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 20, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| February 7, 2020 | Pretreatment - Failure to Develop/Enforce Standards | 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.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.