Clean Water Act discharge permit · NPDES MO0124931
WILMAR ESTATES WWTF, Liberty, MO: NPDES MO0124931 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
WILMAR ESTATES WWTF, held by Elm Hills Utility Operating Company, holds NPDES permit MO0124931, which discharges to Tributary To Rock Cr.. EPA’s file records it issued May 13, 2019 and expiring March 31, 2024. 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 | WILMAR ESTATES WWTF |
|---|---|
| Permittee as filed | Elm Hills Utility Operating Company |
| NPDES ID | MO0124931 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 13, 2019 |
| Expiration date | March 31, 2024 |
| Address | Liberty, MO 64068 |
| Receiving water | Tributary to Rock Cr. |
| Subwatershed | Headwaters Fishing River (HUC 103001010404) |
| 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
- 6Pollutants on file
- 6Under 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 4 | 52 | 38 | June 30, 2026 | 3,229% over the limit |
| E. coli | 2 | 24 | 24 | December 31, 2025 | 96,502% over the limit |
| pH | 2 | 25 | 11 | June 30, 2024 | |
| BOD, 5-day, 20 deg. C | 2 | 16 | 2 | June 30, 2018 | 13% over the limit |
| Solids, total suspended | 2 | 16 | 2 | September 30, 2021 | 27% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 14 | 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
- 11Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 21, 2022 | Effluent Violations - Narrative Effluent Violation | ST6 |
| June 21, 2022 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 26, 2020 | Reporting Violations - Failure to Submit DMRs | ST6 |
| April 20, 2020 | Reporting Violations - Failure to Submit DMRs | ST6 |
| January 2, 2020 | Reporting Violations - Failure to Submit DMRs | ST6 |
| July 1, 2019 | Reporting Violations - Failure to Submit DMRs | ST6 |
| June 29, 2018 | Effluent Violations - Narrative Effluent Violation | ST6 |
| June 29, 2018 | Effluent Violations - Numeric effluent violation | ST6 |
| June 28, 2018 | Effluent Violations - Numeric effluent violation | ST6 |
| December 29, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
| September 15, 2017 | 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.