Clean Water Act discharge permit · NPDES MO0140503
PWSD #2, WRIGHT CITY SOUTH WWTF, Wright City, MO: NPDES MO0140503 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 17Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
PWSD #2, WRIGHT CITY SOUTH WWTF, held by PWSD #2 of St. Charles Co., holds NPDES permit MO0140503, which discharges to Tributary To Peruque Creek. EPA’s file records it issued July 1, 2024 and expiring June 30, 2029. 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 | PWSD #2, WRIGHT CITY SOUTH WWTF |
|---|---|
| Permittee as filed | PWSD #2 of St. Charles Co. |
| NPDES ID | MO0140503 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 1, 2024 |
| Expiration date | June 30, 2029 |
| Address | Wright City, MO 63390 |
| Receiving water | Tributary to Peruque Creek |
| Subwatershed | Headwaters Peruque Creek (HUC 071100090101) |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 18Pollutants on file
- 17Under a numeric limit
- 5With 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 |
|---|---|---|---|---|---|
| Chloride | 2 | 34 | 34 | July 31, 2026 | 248% over the limit |
| Oxygen, dissolved [DO] | 0 | 3 | 3 | April 30, 2025 | 57% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 2 | 2 | July 31, 2025 | 55% over the limit |
| Phosphorus, total [as P] | 7 | 1 | 1 | August 31, 2025 | 10% over the limit |
| Iron, total recoverable | 2 | 1 | 1 | July 31, 2025 | 5% over the limit |
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [TKN] [water] | 4 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Solids, total suspended | 2 | 0 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| E. coli | 2 | 0 | 0 | ||
| Coliform, fecal general | 2 | 0 | 0 | ||
| Animals, total estimated no. of | 2 | 0 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | 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 |
|---|---|---|
| November 21, 2025 | 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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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 MO0140503 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.