Clean Water Act discharge permit · NPDES MO0082996
IATAN GENERATING STATION, Weston, MO: NPDES MO0082996 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 29Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
IATAN GENERATING STATION, held by Evergy, INC., holds NPDES permit MO0082996, which discharges to Tributary To Harpst Chute. EPA’s file records it issued March 20, 2023 and expiring March 31, 2028. 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 | IATAN GENERATING STATION |
|---|---|
| Permittee as filed | Evergy, INC. |
| NPDES ID | MO0082996 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | March 20, 2023 |
| Expiration date | March 31, 2028 |
| Address | Weston, MO 64098 |
| Receiving water | Tributary to Harpst Chute |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mission Creek-Missouri River (HUC 102400110304) |
| NAICS | 221112 – Fossil Fuel Electric Power Generation |
| SIC | 4911 – Electric Services |
| Other EPA IDs (FRS) | RCRA handler MOD000766915; ICIS-AIR source MO0000002916500007 |
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
- 32Pollutants on file
- 29Under a numeric limit
- 6With 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 |
|---|---|---|---|---|---|
| pH | 6 | 428 | 4 | December 31, 2018 | |
| Solids, total suspended | 5 | 220 | 4 | February 28, 2023 | 1,017% over the limit |
| Solids, settleable | 0 | 319 | 3 | January 31, 2010 | 800% over the limit |
| Thermal Discharge | 0 | 214 | 3 | March 31, 2010 | 36% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 218 | 2 | November 30, 2011 | 162% over the limit |
| Oil and grease [soxhlet extr.] tot. | 5 | 316 | 0 | ||
| Flow, in conduit or thru treatment plant | 11 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 6 | 0 | 0 | ||
| Sulfate, total [as SO4] | 5 | 0 | 0 | ||
| Chloride | 5 | 0 | 0 | ||
| Chlorides + Sulfates | 5 | 0 | 0 | ||
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [TKN] [water] | 4 | 0 | 0 | ||
| Aluminum, total recoverable | 3 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 0 | 0 | ||
| Magnesium, total recoverable | 2 | 0 | 0 | ||
| Selenium, total recoverable | 2 | 0 | 0 | ||
| Boron, total recoverable | 2 | 0 | 0 | ||
| Manganese, total [as Mn] | 2 | 0 | 0 | ||
| Molybdenum, total [as Mo] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Aluminum, total [as Al] | 2 | 0 | 0 | ||
| Temp. diff. between up/down stream deg. F | 2 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 2 | 0 | 0 | ||
| Oxygen demand, chem. [high level] [COD] | 1 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 1 | 0 | 0 | ||
| Surfactants [linear alkylate sulfonate] | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 18, 2023 | Effluent Violations - Numeric effluent violation | 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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.