Clean Water Act discharge permit · NPDES MO0112585
WILDHORSE SPRING FARM WWTP, Chesterfield, MO: NPDES MO0112585 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 6Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
WILDHORSE SPRING FARM WWTP, held by Wildhorse Spring Farm POA, holds NPDES permit MO0112585, which discharges to Tributary To Wildhorse Creek. EPA’s file records it issued April 18, 2018 and expiring September 30, 2020. 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 | WILDHORSE SPRING FARM WWTP |
|---|---|
| Permittee as filed | Wildhorse Spring Farm POA |
| NPDES ID | MO0112585 |
| 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 | April 18, 2018 |
| Expiration date | September 30, 2020 |
| Address | Chesterfield, MO 63005 |
| Receiving water | Tributary to Wildhorse Creek |
| Subwatershed | Wildhorse Creek-Missouri River (HUC 103002000607) |
| SIC | 8641 – Civic And Social Associations |
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
- 8Pollutants on file
- 6Under a numeric limit
- 8With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 8 | 22 | 4 | December 31, 2025 | 486% over the limit |
| E. coli | 2 | 21 | 3 | September 30, 2023 | 61% over the limit |
| Ammonia [as N] + unionized ammonia | 0 | 3 | 3 | June 30, 2017 | 200% over the limit |
| Solids, total suspended | 2 | 20 | 2 | June 30, 2017 | 127% over the limit |
| E. coli, colony forming units [CFU] | 0 | 2 | 2 | June 30, 2017 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 2 | 19 | 1 | March 31, 2019 | 23% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 20 | 0 | ||
| pH | 2 | 18 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 1, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| February 2, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| December 11, 2025 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| December 11, 2025 | Reporting Violations - Failure to Submit DMRs | ST6 |
| December 5, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 4, 2025 | Reporting Violations - Failure to Submit DMRs | ST6 |
| December 26, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 26, 2024 | Reporting Violations - Failure to Submit DMRs | ST6 |
| September 28, 2021 | 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.
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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 MO0112585 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.