Clean Water Act discharge permit · NPDES MO0084689
WALKER HILL MHP WWTF, De Soto, MO: NPDES MO0084689 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
WALKER HILL MHP WWTF, held by Weston Property Holdings, LLC, holds NPDES permit MO0084689, which discharges to Tributary To Joachim Cr.. EPA’s file records it issued January 8, 2018 and expiring June 30, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | WALKER HILL MHP WWTF |
|---|---|
| Permittee as filed | Weston Property Holdings, LLC |
| NPDES ID | MO0084689 |
| 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 | January 8, 2018 |
| Expiration date | June 30, 2022 |
| Address | De Soto, MO 63020 |
| Receiving water | Tributary to Joachim Cr. |
| Subwatershed | Upper Joachim Creek (HUC 071401010801) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 8Pollutants on file
- 8Under a numeric limit
- 8With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 2 | 20 | 2 | December 31, 2011 | 47% over the limit |
| pH | 1 | 11 | 2 | September 30, 2018 | |
| Nitrogen, ammonia total [as N] | 4 | 18 | 0 | ||
| Solids, total suspended | 2 | 18 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 18 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 12 | 0 | ||
| Chlorine, total residual | 2 | 12 | 0 | ||
| E. coli | 2 | 12 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 29, 2025 | Effluent Violations - Numeric effluent violation | ST6 |
| March 30, 2020 | Reporting Violations - Failure to Submit DMRs | ST6 |
| March 30, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 17, 2017 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| May 17, 2017 | Permit Violations - Failure to Submit Timely Permit Renewal Application | 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, MO0084689.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 MO0084689 there.
Nearby on the register
- Discharge permits in De Soto
- Every permit record in De Soto, A to Z
- Discharge permits in Missouri
- Every permit record in Missouri, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.