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
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 (September 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) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
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 |
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 MI0021164 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.