Clean Water Act discharge permit · NPDES MI0021164
TRENTON WWTP, Trenton, MI: NPDES MI0021164 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 12Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
TRENTON WWTP, held by City of Trenton, holds NPDES permit MI0021164, which discharges to Elizabeth Park Canal. EPA’s file records it issued September 30, 2013 and expiring October 1, 2017. 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 | TRENTON WWTP |
|---|---|
| Permittee as filed | City of Trenton |
| NPDES ID | MI0021164 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 30, 2013 |
| Expiration date | October 1, 2017 |
| Issuing agency | State |
| Address | Trenton, MI 48183 |
| Receiving water | Elizabeth Park Canal |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Huntington Creek-Frontal Lake Erie (HUC 040900040503) |
| Program components on file | Biosolids, POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MID980619118 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 15Pollutants on file
- 12Under a numeric limit
- 15With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 56 | 16 | February 28, 2018 | 43% over the limit |
| pH | 2 | 26 | 6 | April 30, 2009 | |
| Phosphorus, total [as P] | 2 | 26 | 3 | February 28, 2007 | 29% over the limit |
| Mercury, total [as Hg] | 4 | 56 | 2 | March 31, 2015 | 314% over the limit |
| Chlorine, total residual | 1 | 19 | 1 | January 31, 2005 | 5,163% over the limit |
| Solids, suspended percent removal | 1 | 13 | 1 | January 31, 2007 | 28% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 46 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 28 | 0 | ||
| Boron, total [as B] | 0 | 28 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 26 | 0 | ||
| Coliform, fecal general | 2 | 22 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 1 | 12 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 10 | 0 | ||
| Copper, total [as Cu] | 0 | 7 | 0 | ||
| Toxicity [chronic], Ceriodaphnia dubia | 0 | 7 | 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 |
|---|---|---|
| January 15, 2026 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| January 8, 2026 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| June 25, 2025 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| June 23, 2025 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| May 17, 2025 | Management Practice Violations - Failure to Maintain Records | ST6 |
| January 1, 2022 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| August 23, 2021 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| August 23, 2021 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| August 23, 2021 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| June 5, 2020 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| October 31, 2019 | Reporting Violations - Late Submittal of DMRs | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| January 7, 2026 | Audit | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
| Date | What EPA recorded | Agency |
|---|---|---|
| April 28, 2026 | Notice of Violation | State |
| March 9, 2026 | Letter of Violation/ Warning Letter | State |
| February 25, 2026 | Letter of Violation/ Warning Letter | State |
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.