Clean Water Act discharge permit · NPDES MO0085472
DCSD TREATMENT PLANT 1, St. Charles, MO: NPDES MO0085472 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 7Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
DCSD TREATMENT PLANT 1, held by DCSD Treatment Plant 1, holds NPDES permit MO0085472, which discharges to 8-20-13 Mudd V1.0. EPA’s file records it issued December 19, 2016 and expiring June 30, 2021. 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 | DCSD TREATMENT PLANT 1 |
|---|---|
| Permittee as filed | DCSD Treatment Plant 1 |
| NPDES ID | MO0085472 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 19, 2016 |
| Expiration date | June 30, 2021 |
| Issuing agency | MODNR-Water Protection Program |
| Address | St. Charles, MO 63303 |
| Receiving water | 8-20-13 MUDD V1.0 |
| Subwatershed | Duckett Creek-Missouri River (HUC 103002000704) |
| 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
- 14Pollutants on file
- 7Under a numeric limit
- 14With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 16 | 8 | February 28, 2009 | 1,327% over the limit |
| pH | 2 | 14 | 6 | March 31, 2017 | |
| E. coli | 2 | 7 | 5 | July 31, 2021 | 1,075% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 8 | 2 | August 31, 2004 | 1,682% over the limit |
| Coliform, fecal general | 0 | 56 | 0 | ||
| Nitrogen, ammonia total [as N] | 6 | 2 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 2 | 0 | ||
| Nitrogen, total [as N] | 0 | 2 | 0 | ||
| Phosphorus, total [as P] | 0 | 2 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 0 | 1 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 1 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 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
- 11Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 3, 2026 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| August 3, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 11, 2025 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| March 11, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| October 8, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| October 8, 2020 | Permit Violations - Violation Specified in Comment | ST6 |
| October 8, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| April 1, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 14, 2018 | Effluent Violations - Narrative Effluent Violation | ST6 |
| June 14, 2018 | Effluent Violations - Unauthorized Discharge | ST6 |
| June 14, 2018 | Management Practice Violations - Improper Operation and Maintenance | 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 MO0085472 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.