Clean Water Act discharge permit · NPDES MI0023647
MT CLEMENS WWTP, Mount Clemens, MI: NPDES MI0023647 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
MT CLEMENS WWTP, held by City of Mount Clemens, holds NPDES permit MI0023647. EPA’s file records it issued May 17, 2017 and expiring October 1, 2020. 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 | MT CLEMENS WWTP |
|---|---|
| Permittee as filed | City of Mount Clemens |
| NPDES ID | MI0023647 |
| 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 | May 17, 2017 |
| Expiration date | October 1, 2020 |
| Issuing agency | State |
| Address | Mount Clemens, MI 48043 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Cranberry Marsh Drain-Clinton River (HUC 040900030402) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 27Pollutants on file
- 26Under a numeric limit
- 13With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| Mercury, total [as Hg] | 8 | 41 | 30 | April 30, 2025 | 1,377% over the limit |
| Nitrogen, ammonia total [as N] | 26 | 43 | 9 | May 31, 2025 | 520% over the limit |
| pH | 6 | 34 | 6 | August 31, 2011 | |
| Oxygen, dissolved [DO] | 5 | 18 | 6 | August 31, 2019 | 12% over the limit |
| Phosphorus, total [as P] | 12 | 75 | 2 | July 31, 2007 | 10% over the limit |
| Chlorine, total residual | 2 | 9 | 2 | January 31, 2006 | 1,005% over the limit |
| Coliform, fecal general | 6 | 29 | 1 | May 31, 2011 | 17% over the limit |
| Solids, suspended percent removal | 4 | 7 | 1 | April 30, 2004 | 120% over the limit |
| Solids, total suspended | 18 | 44 | 0 | ||
| Flow, in conduit or thru treatment plant | 8 | 40 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 34 | 32 | 0 | ||
| BOD, 5-day, 20 deg. C | 0 | 12 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 4 | 6 | 0 | ||
| Solids, total | 3 | 0 | 0 | ||
| Arsenic, dry weight | 3 | 0 | 0 | ||
| Selenium, dry weight | 3 | 0 | 0 | ||
| Copper, dry weight | 3 | 0 | 0 | ||
| Cadmium, dry weight | 3 | 0 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 0 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 0 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 0 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 0 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 0 | 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 |
|---|---|---|
| April 29, 2025 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| January 1, 2022 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| January 1, 2022 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| October 31, 2021 | Reporting Violations - Late Submittal of DMRs | ST6 |
| September 9, 2021 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| September 9, 2021 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| August 6, 2020 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| August 6, 2020 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| May 22, 2020 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| May 7, 2019 | Permit Violations - Unapproved Operation | ST6 |
| May 1, 2019 | Monitoring Violations - Improper Analysis or Lab Error | 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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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.