Clean Water Act discharge permit · NPDES MO0087912
WARRENTON WWTP, Warrenton, MO: NPDES MO0087912 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
WARRENTON WWTP, held by City of Warrenton, holds NPDES permit MO0087912, which discharges to Tributary To Hickory Lick Creek. EPA’s file records it issued June 1, 2025 and expiring May 31, 2030. 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 | WARRENTON WWTP |
|---|---|
| Permittee as filed | City of Warrenton |
| NPDES ID | MO0087912 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 1, 2025 |
| Expiration date | May 31, 2030 |
| Address | Warrenton, MO 63383 |
| Receiving water | Tributary to Hickory Lick Creek |
| Subwatershed | Upper Big Creek (HUC 071100080404) |
| Program components on file | Biosolids, POTW |
| 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
- 16Pollutants on file
- 11Under a numeric limit
- 10With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, percent removal | 1 | 6 | 6 | May 31, 2026 | 73% over the limit |
| Nitrogen, ammonia total [as N] | 22 | 5 | 5 | April 30, 2026 | 360% over the limit |
| pH | 2 | 5 | 5 | June 30, 2026 | |
| Zinc, total recoverable | 0 | 5 | 1 | November 30, 2014 | 7% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 1 | 1 | March 31, 2025 | 19% over the limit |
| E. coli | 2 | 1 | 1 | May 31, 2026 | 79% over the limit |
| Oil and grease [soxhlet extr.] tot. | 0 | 34 | 0 | ||
| Copper, total recoverable | 0 | 4 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 0 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 0 | 1 | 0 | ||
| Solids, total suspended | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Solids, suspended percent removal | 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
- 7Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 7, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| July 3, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| April 30, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| November 14, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| October 11, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| August 21, 2019 | Permit Violations - Violation Specified in Comment | ST6 |
| August 21, 2019 | WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMP | 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 MO0087912 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.