Clean Water Act discharge permit · NPDES MO0000353
AMEREN - SIOUX (WEST ALTON ENERGY CTR), West Alton, MO: NPDES MO0000353 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 32Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
AMEREN - SIOUX (WEST ALTON ENERGY CTR), held by Ameren Missouri, holds NPDES permit MO0000353, which discharges to Tributary To Brick House Slough. EPA’s file records it issued April 1, 2017 and expiring March 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 | AMEREN - SIOUX (WEST ALTON ENERGY CTR) |
|---|---|
| Permittee as filed | Ameren Missouri |
| NPDES ID | MO0000353 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | April 1, 2017 |
| Expiration date | March 31, 2022 |
| Address | West Alton, MO 63386 |
| Receiving water | Tributary to Brick House Slough |
| Subwatershed | Marais Temps Clair-Mississippi River (HUC 071100090401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 35Pollutants on file
- 32Under a numeric limit
- 8With 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 | 6 | 33 | 17 | March 31, 2025 | 275% over the limit |
| E. coli | 4 | 3 | 3 | June 30, 2026 | 894% over the limit |
| Oil and grease [soxhlet extr.] tot. | 4 | 13 | 1 | May 31, 2008 | 50% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 1 | 1 | February 28, 2017 | 4% over the limit |
| pH | 6 | 16 | 0 | ||
| Thermal Discharge | 2 | 10 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 2 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 2 | 0 | ||
| Temperature, water deg. fahrenheit | 21 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 8 | 0 | 0 | ||
| Solids, Total Suspended, Net Value | 4 | 0 | 0 | ||
| Temp. diff. between up/down stream deg. F | 4 | 0 | 0 | ||
| Month excursion time [min] | 3 | 0 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 0 | 0 | ||
| Sulfate, total [as SO4] | 2 | 0 | 0 | ||
| Fluoride | 2 | 0 | 0 | ||
| Arsenic, total recoverable | 2 | 0 | 0 | ||
| Iron, total recoverable | 2 | 0 | 0 | ||
| Selenium, total recoverable | 2 | 0 | 0 | ||
| Titanium, total recoverable | 2 | 0 | 0 | ||
| Boron, total recoverable | 2 | 0 | 0 | ||
| Aluminum, total recoverable | 2 | 0 | 0 | ||
| Molybdenum, total recoverable | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Chloride | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Stream flow, estimated | 2 | 0 | 0 | ||
| Flow, process wastewater | 2 | 0 | 0 | ||
| Chlorides + Sulfates | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 30, 2019 | WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMP | 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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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 MO0000353 there.
Nearby on the register
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- Every permit record in West Alton, A to Z
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- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.