Clean Water Act discharge permit · NPDES MI0023655
MT PLEASANT WWTP, Mount Pleasant, MI: NPDES MI0023655 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 35Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
MT PLEASANT WWTP holds NPDES permit MI0023655, which discharges to Chippewa River. EPA’s file records it issued March 24, 2015 and expiring January 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 PLEASANT WWTP |
|---|---|
| Permittee as filed | MT PLEASANT WWTP |
| NPDES ID | MI0023655 |
| 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 | March 24, 2015 |
| Expiration date | January 1, 2020 |
| Address | Mount Pleasant, MI 48858 |
| Receiving water | CHIPPEWA RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mission Creek-Chippewa River (HUC 040802020501) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 36Pollutants on file
- 35Under a numeric limit
- 36With a violation of any kind
- 12With 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] | 13 | 40 | 21 | January 31, 2016 | 2,800% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 28 | 20 | September 30, 2025 | 375% over the limit |
| E. coli | 4 | 18 | 14 | August 31, 2025 | 490% over the limit |
| Phosphorus, total [as P] | 8 | 19 | 11 | November 30, 2025 | 790% over the limit |
| pH | 8 | 14 | 8 | December 31, 2024 | |
| Solids, suspended percent removal | 2 | 10 | 6 | July 31, 2017 | 290% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 20 | 15 | 2 | July 31, 2020 | 415% over the limit |
| Coliform, fecal general | 4 | 9 | 2 | March 31, 2013 | 20% over the limit |
| Chlorine, total residual | 2 | 5 | 2 | September 30, 2017 | 7,697% over the limit |
| Solids, total suspended | 12 | 14 | 1 | September 30, 2015 | 210% over the limit |
| Selenium, total [as Se] | 4 | 5 | 1 | December 31, 2016 | 67% over the limit |
| Oxygen, dissolved [DO] | 2 | 4 | 1 | June 30, 2006 | 20% over the limit |
| Flow, in conduit or thru treatment plant | 6 | 9 | 0 | ||
| Arsenic, dry weight | 3 | 3 | 0 | ||
| Selenium, dry weight | 3 | 3 | 0 | ||
| Copper, dry weight | 3 | 3 | 0 | ||
| Cadmium, dry weight | 3 | 3 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 3 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 3 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 2 | 2 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 1 | 0 | ||
| Outfall observation,visual, y/n response | 2 | 1 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 1 | 0 | ||
| Annual amt of sludge incinerated | 1 | 1 | 0 | ||
| Annual sludge production, total | 1 | 1 | 0 | ||
| Annual amount of sludge land applied | 1 | 1 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 1 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 1 | 0 | ||
| Annual amt sludge transported interstate | 1 | 1 | 0 | ||
| Pollutant table from 503.13 | 1 | 1 | 0 | ||
| Level of pathogen requirements achieved | 1 | 1 | 0 | ||
| Description of pathogen option used | 1 | 1 | 0 | ||
| Vector attraction reduction alternative used | 1 | 1 | 0 | ||
| Solids, total | 0 | 1 | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| May 17, 2018 | Effluent Violations - Narrative Effluent Violation | EP6 |
| May 17, 2018 | Management Practice Violations - Improper Operation and Maintenance | EP6 |
| May 17, 2018 | Management Practice Violations - Failure to Maintain Records | EP6 |
| May 17, 2018 | Monitoring Violations - Invalid/Unrepresentative Sample | EP6 |
| May 17, 2018 | Monitoring Violations - Frequency of Sampling Violation | EP6 |
| May 17, 2018 | Reporting Violations - Improper/ Incorrect Reporting | EP6 |
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.