Clean Water Act discharge permit · NPDES MO0000361
AMEREN MISSOURI - MERAMEC ENERGY CENTER, St. Louis, MO: NPDES MO0000361 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 22Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
AMEREN MISSOURI - MERAMEC ENERGY CENTER, held by Ameren-Missouri, holds NPDES permit MO0000361, which discharges to Mississippi River. EPA’s file records it issued December 28, 2017 and expiring December 31, 2022.
AMEREN MISSOURI - MERAMEC ENERGY CENTER, St. Louis, Missouri: Individual permit MO0000361, held by Ameren-Missouri; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued December 28, 2017, term to December 31, 2022; discharges to Mississippi River; Hydroelectric Power Generation.
- Solids, total suspended: 4 limits, 64 violations of any kind, 18 effluent exceedances, latest April 30, 2023, largest 733% over the limit.
- pH: 2 limits, 77 violations of any kind, 8 effluent exceedances, latest August 31, 2023.
- Thermal Discharge: 4 limits, 188 violations of any kind, 3 effluent exceedances, latest December 31, 2005, largest 260% over the limit.
- BOD, 5-day, 20 deg. C: 0 limits, 31 violations of any kind, 3 effluent exceedances, latest February 28, 2003, largest 27% over the limit.
- Aluminum, total recoverable: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest April 30, 2025, largest 27% over the limit.
- Oil and grease [soxhlet extr.] tot.: 2 limits, 49 violations of any kind, 0 effluent exceedances.
- Pass/Fail Static 48Hr Acute Ceriodaphnia dubia: 0 limits, 22 violations of any kind, 0 effluent exceedances.
- LC50 Static 48Hr Acute Pimephales promelas: 0 limits, 22 violations of any kind, 0 effluent exceedances.
- Flow, in conduit or thru treatment plant: 10 limits, 20 violations of any kind, 0 effluent exceedances.
- Temperature, water deg. fahrenheit: 8 limits, 16 violations of any kind, 0 effluent exceedances.
- Temp. diff. between up/down stream deg. F: 4 limits, 8 violations of any kind, 0 effluent exceedances.
- Stream flow, estimated: 4 limits, 8 violations of any kind, 0 effluent exceedances.
- Month excursion time [min]: 4 limits, 4 violations of any kind, 0 effluent exceedances.
- Nitrogen, total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Nitrite + Nitrate total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Phosphorus, total [as P]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Sulfate, total [as SO4]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Iron, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Zinc, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Copper, total recoverable: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chromium, hexavalent dissolved [as Cr]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chloride: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Chlorides + Sulfates: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [chronic], Ceriodaphnia dubia: 1 limit, 0 violations of any kind, 0 effluent exceedances.
- Toxicity [chronic], Pimephales promelas [Fathead Minnow]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Missouri holds 210 Industrial stormwater coverages of this permit type in EPA’s file; 106 were issued before MO0000361.
Coverages issued nearest MO0000361
- December 11, 2017: WORLDS OF FUN, Kansas City, MO0103659, held by Cedar Fair, LP
- December 11, 2017: MISSOURI RIVER TERMINAL, Kansas City, MO0138789, held by Port Authority of Kansas City, Missouri
- December 13, 2017: MOTT AUTO SALES, Lebanon, MO0137227, held by Brandon Mott
- December 18, 2017: AMOCO,CHARITON RIVER OIL SPILL SITE, Ethel, MO0112526, held by BP PIPELINES NORTH AMERICA INC.
- December 19, 2017: JD STREETT AND COMPANY, INC., St. Louis, MO0121169, held by JD Streett and Company, Inc
- January 1, 2018: SCHAEFFLER GROUP USA INC., Joplin, MO0054101, held by FAG Bearings LLC
- January 1, 2018: TIMBER RIDGE LANDFILL COMPANY, Richwoods, MO0127345, held by Timber Ridge Landfill Company
- January 4, 2018: EBV EXPLOSIVES ENVIRONMENTAL, Carthage, MO0113506, held by EBV Explosives Environmental Company
- January 29, 2018: EXPERT MANAGEMENT, INC., Carthage, MO0002453, held by Expert Management, Inc.
- March 8, 2018: UNITED STATES GYPSUM COMPANY, North Kansas City, MO0136263, held by United States Gypsum Corporation
AMEREN MISSOURI - MERAMEC ENERGY CENTER among its neighbors
EPA’s permit file holds 16 discharge permits in the Carr Creek-Mississippi River subwatershed (HUC 071401010603), MO0000361 among them. Its county holds 872, 8 of them major permits; MO0000361 is a major permit.
Other permits in the Carr Creek-Mississippi River subwatershed (HUC 071401010603)
- ADMIRAL TROST OFFICE LOT 9 OFFICE BUILDING, Columbia: ILR10ZDDI, minor permit, permit term to August 31, 2028
- AMEREN MISSOURI - MERAMEC ENERGY CENTER, St. Louis: MORA28173, minor permit, discharging to Tributary to Meramec R., permit term to February 7, 2027
- BECKER PINES, Oakville: MORA29875, minor permit, discharging to Tributary to Mississippi R., permit term to February 7, 2027
- COLUMBIA HIGH SCHOOL BUILDING ADDITION, Columbia: ILR10ZDOV, minor permit, permit term to August 31, 2028
- COLUMBIA HIGH SCHOOL PARKING LOT IMPROVEMENTS, Columbia: ILR10ZDGA, minor permit, permit term to August 31, 2028
- COUNTRY CROSSINGS II, Columbia: ILR10ZE1O, minor permit, permit term to August 31, 2028
- FIFTH ADDITION TO PIONEER RIDGE, Columbia: ILR10ZH7X, minor permit, permit term to August 31, 2028
- HOPE AND RESTORATION COMMUNITY CENTER, Imperial: MORA27004, minor permit, discharging to Tributary to Mississippi R., permit term to February 7, 2027
- LIFE COMMUNITY CHURCH, Columbia: ILR10ZGVL, minor permit, permit term to August 31, 2028
- MSD LOWER MERAMEC WWTP, St. Louis: MO0127949, major permit, discharging to Mississippi R., permit term to December 31, 2022
Identity
| Facility as filed | AMEREN MISSOURI - MERAMEC ENERGY CENTER |
|---|---|
| Permittee as filed | Ameren-Missouri |
| NPDES ID | MO0000361 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | December 28, 2017 |
| Expiration date | December 31, 2022 |
| Address | St. Louis, MO 63129 |
| Receiving water | Mississippi River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Carr Creek-Mississippi River (HUC 071401010603) |
| NAICS | 221111 – Hydroelectric Power Generation |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler MOD086817897; ICIS-AIR source MO0000002918900010 |
Effluent limits and exceedances
- 25Pollutants on file
- 22Under a numeric limit
- 13With 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 | 4 | 64 | 18 | April 30, 2023 | 733% over the limit |
| pH | 2 | 77 | 8 | August 31, 2023 | |
| Thermal Discharge | 4 | 188 | 3 | December 31, 2005 | 260% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 31 | 3 | February 28, 2003 | 27% over the limit |
| Aluminum, total recoverable | 2 | 1 | 1 | April 30, 2025 | 27% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 49 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 22 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 22 | 0 | ||
| Flow, in conduit or thru treatment plant | 10 | 20 | 0 | ||
| Temperature, water deg. fahrenheit | 8 | 16 | 0 | ||
| Temp. diff. between up/down stream deg. F | 4 | 8 | 0 | ||
| Stream flow, estimated | 4 | 8 | 0 | ||
| Month excursion time [min] | 4 | 4 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Sulfate, total [as SO4] | 2 | 0 | 0 | ||
| Iron, total recoverable | 2 | 0 | 0 | ||
| Zinc, total recoverable | 2 | 0 | 0 | ||
| Copper, total recoverable | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Chloride | 2 | 0 | 0 | ||
| Chlorides + Sulfates | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 0 | 0 |
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MO0000361.
Inspections
EPA’s inspection file holds no inspection for NPDES MO0000361.
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES MO0000361.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.