Clean Water Act discharge permit · NPDES MOG490601
ST. CHARLES COUNTY CONCRETE, Wentzville, MO: NPDES MOG490601 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
ST. CHARLES COUNTY CONCRETE, held by Warren County Concrete, L.L.C., holds NPDES permit MOG490601, which discharges to Tributary To Peruque Cr.. EPA’s file records it issued July 8, 2022 and expiring April 30, 2027. 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 | ST. CHARLES COUNTY CONCRETE |
|---|---|
| Permittee as filed | Warren County Concrete, L.L.C. |
| NPDES ID | MOG490601 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Industrial stormwater |
| Issued | July 8, 2022 |
| Expiration date | April 30, 2027 |
| Address | Wentzville, MO 63385 |
| Receiving water | Tributary to Peruque Cr. |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Headwaters Peruque Creek (HUC 071100090101) |
| Other EPA IDs (FRS) | ICIS-AIR source MO0000002918300079 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 5Pollutants on file
- 0Under a numeric limit
- 5With a violation of any kind
- 2With 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 | 0 | 9 | 5 | June 30, 2026 | |
| Solids, total suspended | 0 | 4 | 2 | March 31, 2026 | 157% over the limit |
| Oil and grease [soxhlet extr.] tot. | 0 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 4 | 0 | ||
| Solids, settleable | 0 | 2 | 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 7, 2026 | 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.
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, MOG490601.
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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 MOG490601 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.