Clean Water Act discharge permit · NPDES MO0025151
MSD LEMAY WWTP, St. Louis, MO: NPDES MO0025151 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
MSD LEMAY WWTP, held by Metropolitan St. Louis Sewer District, holds NPDES permit MO0025151, which discharges to Mississippi 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 (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MSD LEMAY WWTP |
|---|---|
| Permittee as filed | Metropolitan St. Louis Sewer District |
| NPDES ID | MO0025151 |
| 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 63125 |
| Receiving water | Mississippi R. |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Schoenberger Creek-Mississippi River (HUC 071401010403) |
| Program components on file | Biosolids, CSO, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MOR000001015; ICIS-AIR source MO0000002918900217 |
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
- 38Pollutants on file
- 19Under a numeric limit
- 32With a violation of any kind
- 8With 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 | 6 | 121 | 15 | March 31, 2019 | 78% over the limit |
| Solids, settleable | 0 | 26 | 12 | October 31, 2010 | 1,433% over the limit |
| Chlorine, total residual | 2 | 71 | 5 | October 31, 2017 | 321% over the limit |
| pH | 2 | 124 | 3 | October 31, 2011 | |
| Oil and grease [soxhlet extr.] tot. | 2 | 126 | 2 | February 28, 2014 | 200% over the limit |
| Nitrogen, ammonia total [as NH4] | 0 | 90 | 1 | November 30, 2007 | 12% over the limit |
| E. coli, colony forming units [CFU] | 0 | 67 | 1 | October 31, 2016 | 32% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 1 | 1 | February 28, 2009 | 29% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 212 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 116 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 6 | 106 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 106 | 0 | ||
| Nitrogen, total [as N] | 2 | 32 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 32 | 0 | ||
| Phosphorus, total [as P] | 2 | 32 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 32 | 0 | ||
| Silver total recoverable | 2 | 32 | 0 | ||
| Cadmium, total recoverable | 2 | 32 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 0 | 32 | 0 | ||
| Arsenic, total recoverable | 0 | 32 | 0 | ||
| Nickel, total recoverable | 0 | 32 | 0 | ||
| Zinc, total recoverable | 0 | 32 | 0 | ||
| Lead, total recoverable | 0 | 32 | 0 | ||
| Mercury, total recoverable | 0 | 32 | 0 | ||
| Copper, total recoverable | 0 | 30 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 0 | 30 | 0 | ||
| Chromium, trivalent total recoverable | 0 | 30 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 12 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 12 | 0 | ||
| Organics, total toxic [TTO] | 0 | 6 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 0 | 6 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 5 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 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 |
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 MO0025151.
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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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 MO0025151 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.