Clean Water Act discharge permit · NPDES MO0098001
AMEREN MISSOURI - CALLAWAY ENERGY CENTER, Steedman, MO: NPDES MO0098001 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 24Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
- 0Inspections on file
- 0Formal enforcement actions
AMEREN MISSOURI - CALLAWAY ENERGY CENTER, held by Union Electric Company d/b/a Ameren MO, holds NPDES permit MO0098001, which discharges to Missouri River. EPA’s file records it issued July 1, 2020 and expiring June 30, 2025. 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 | AMEREN MISSOURI - CALLAWAY ENERGY CENTER |
|---|---|
| Permittee as filed | Union Electric Company d/b/a Ameren MO |
| NPDES ID | MO0098001 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | July 1, 2020 |
| Expiration date | June 30, 2025 |
| Address | Steedman, MO 65251 |
| Receiving water | Missouri River |
| Subwatershed | Cow Creek (HUC 103001021504) |
| NAICS | 221113 – Nuclear Electric Power Generation |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler MOD000687392; ICIS-AIR source MO0000002902700026 |
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
- 27Pollutants on file
- 24Under a numeric limit
- 11With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 8 | 106 | 10 | December 31, 2020 | 99,900% over the limit |
| Oil and grease [soxhlet extr.] tot. | 22 | 132 | 2 | November 30, 2013 | 113% over the limit |
| Biocides | 2 | 2 | 2 | May 31, 2020 | 40% over the limit |
| pH | 24 | 196 | 1 | October 31, 2020 | |
| Solids, total suspended | 23 | 126 | 0 | ||
| Boron, total recoverable | 2 | 88 | 0 | ||
| Nitrogen, ammonia total [as N] | 6 | 30 | 0 | ||
| Day - max excursion time [min] | 4 | 15 | 0 | ||
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 0 | 11 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 11 | 0 | ||
| BOD, 5-day, 20 deg. C | 0 | 6 | 0 | ||
| Flow | 16 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 15 | 0 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 10 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 8 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 8 | 0 | 0 | ||
| Phosphorus, total [as P] | 8 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [TKN] [water] | 8 | 0 | 0 | ||
| Aluminum, total recoverable | 2 | 0 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 2 | 0 | 0 | ||
| Chloride | 2 | 0 | 0 | ||
| E. coli | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Solids, total dissolved | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 11, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| June 30, 2017 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
Inspections
EPA’s inspection file holds no inspection for NPDES MO0098001.
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 MO0098001.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MO0098001.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MO0098001 there.
Nearby on the register
- Discharge permits in Steedman
- Every permit record in Steedman, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.