Clean Water Act discharge permit · NPDES MO0094714
MENDON WWTF, Mendon, MO: NPDES MO0094714 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
MENDON WWTF, held by City of Mendon, holds NPDES permit MO0094714, which discharges to Hickory Br.. EPA’s file records it issued December 14, 2020 and expiring December 31, 2025. 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 | MENDON WWTF |
|---|---|
| Permittee as filed | City of Mendon |
| NPDES ID | MO0094714 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 14, 2020 |
| Expiration date | December 31, 2025 |
| Address | Mendon, MO 64660 |
| Receiving water | Hickory Br. |
| Subwatershed | Yellow Creek (HUC 102801031401) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 9Under a numeric limit
- 9With 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 |
|---|---|---|---|---|---|
| E. coli | 2 | 46 | 32 | June 30, 2026 | 99,999% over the limit |
| Solids, total suspended | 3 | 46 | 8 | April 30, 2020 | 281% over the limit |
| pH | 2 | 33 | 4 | October 31, 2017 | |
| BOD, 5-day, 20 deg. C | 3 | 35 | 1 | April 30, 2020 | 12% over the limit |
| BOD, 5-day, percent removal | 1 | 3 | 1 | March 31, 2024 | 34% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 34 | 0 | ||
| Oil and grease [soxhlet extr.] tot. | 2 | 30 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 26 | 0 | ||
| Solids, suspended percent removal | 1 | 2 | 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 22, 2026 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| June 22, 2026 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| June 22, 2026 | Permit Violations - Unapproved Operation | ST6 |
| June 22, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 22, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| April 6, 2021 | Permit Violations - Violation Specified in Comment | ST6 |
| April 6, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 6, 2021 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| April 6, 2021 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| April 6, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| March 30, 2017 | Effluent Violations - Numeric effluent violation | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 MO0094714 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.