Clean Water Act discharge permit · NPDES MO0004391
MSD MISSOURI RIVER WWTP, St. Louis, MO: NPDES MO0004391 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 17Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
MSD MISSOURI RIVER WWTP, held by Metropolitan St Louis Sewer District, holds NPDES permit MO0004391, which discharges to Missouri R.. EPA’s file records it issued December 15, 2017 and expiring December 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MSD MISSOURI RIVER WWTP |
|---|---|
| Permittee as filed | Metropolitan St Louis Sewer District |
| NPDES ID | MO0004391 |
| 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 | December 15, 2017 |
| Expiration date | December 31, 2022 |
| Address | St. Louis, MO 63146 |
| Receiving water | Missouri R. |
| Subwatershed | Creve Coeur Creek (HUC 103002000703) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 29Pollutants on file
- 17Under a numeric limit
- 18With 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 |
|---|---|---|---|---|---|
| Oil and grease [soxhlet extr.] tot. | 2 | 111 | 1 | November 30, 2006 | 7% over the limit |
| CBOD5+NH3-N | 0 | 72 | 1 | April 30, 2007 | 32% over the limit |
| Solids, total suspended | 2 | 10 | 1 | July 31, 2014 | 2% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 2 | 1 | 1 | January 31, 2013 | 7% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 38 | 0 | ||
| Nitrogen, total [as N] | 2 | 28 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 28 | 0 | ||
| Phosphorus, total [as P] | 2 | 28 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 0 | 28 | 0 | ||
| Solids, settleable | 0 | 28 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 28 | 0 | ||
| Cadmium, total recoverable | 0 | 28 | 0 | ||
| Lead, total recoverable | 0 | 28 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 0 | 4 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 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 | ||
| pH | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| E. coli | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 0 | 0 | ||
| BOD, carbonaceous, percent removal | 1 | 0 | 0 | ||
| Solids, suspended percent removal | 1 | 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 |
|---|---|---|
| March 2, 2022 | Permit Violations - Unapproved Operation | ST6 |
| August 10, 2021 | Permit Violations - Unapproved Operation | ST6 |
| April 2, 2018 | Effluent Violations - Narrative Effluent Violation | ST6 |
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 MO0004391 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.