Clean Water Act discharge permit · NPDES MO0103942
WALKER WWTF, Walker, MO: NPDES MO0103942 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 11Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
WALKER WWTF, held by City of Walker, holds NPDES permit MO0103942, which discharges to Tributary To Robinson Branch. EPA’s file records it issued June 29, 2017 and expiring December 31, 2021. 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 | WALKER WWTF |
|---|---|
| Permittee as filed | City of Walker |
| NPDES ID | MO0103942 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 29, 2017 |
| Expiration date | December 31, 2021 |
| Address | Walker, MO 64790 |
| Receiving water | Tributary to Robinson Branch |
| Subwatershed | Robinson Branch (HUC 102901050103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 12Pollutants on file
- 11Under a numeric limit
- 12With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Solids, suspended percent removal | 1 | 22 | 13 | May 31, 2024 | 186% over the limit |
| BOD, 5-day, percent removal | 1 | 17 | 8 | June 30, 2025 | 98% over the limit |
| Oil and grease [soxhlet extr.] tot. | 2 | 23 | 5 | January 31, 2022 | 361% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 28 | 2 | July 31, 2025 | 118% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 20 | 2 | May 31, 2026 | 9% over the limit |
| E. coli | 2 | 18 | 2 | July 31, 2025 | 4,370% over the limit |
| Solids, total suspended | 2 | 27 | 1 | September 30, 2009 | 16% over the limit |
| pH | 1 | 38 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 24 | 0 | ||
| Phosphorus, total [as P] | 0 | 6 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | 1 | 1 | 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 |
|---|---|---|
| June 26, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 6, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 6, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| December 6, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| September 21, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| September 21, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 28, 2019 | Reporting Violations - Failure to Submit DMRs | 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 MO0103942 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.