Clean Water Act discharge permit · NPDES MI0023167
IMLAY CITY WWTP, Imlay City, MI: NPDES MI0023167 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 22Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
IMLAY CITY WWTP, held by City of Imlay City, holds NPDES permit MI0023167, which discharges to North Branch Belle River. EPA’s file records it issued April 23, 2019 and expiring October 1, 2023. 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 | IMLAY CITY WWTP |
|---|---|
| Permittee as filed | City of Imlay City |
| NPDES ID | MI0023167 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | April 23, 2019 |
| Expiration date | October 1, 2023 |
| Issuing agency | State |
| Address | Imlay City, MI 48444 |
| Receiving water | North Branch Belle River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | North Branch Belle River (HUC 040900010401) |
| Program components on file | Biosolids, POTW |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 25Pollutants on file
- 22Under a numeric limit
- 25With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 12 | 202 | 40 | November 30, 2025 | 1,938% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 160 | 16 | April 30, 2025 | 68% over the limit |
| pH | 2 | 77 | 3 | July 31, 2012 | |
| Oxygen, dissolved [DO] | 2 | 65 | 3 | July 31, 2024 | 17% over the limit |
| Cyanide [A] | 0 | 69 | 2 | July 31, 2012 | 454% over the limit |
| Solids, total suspended | 4 | 152 | 0 | ||
| Phosphorus, total [as P] | 4 | 122 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 74 | 0 | ||
| Coliform, fecal general | 2 | 74 | 0 | ||
| Copper, total [as Cu] | 0 | 5 | 0 | ||
| Zinc, total [as Zn] | 0 | 5 | 0 | ||
| Solids, total | 3 | 3 | 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 | ||
| Nitrogen, total Kjeldahl | 3 | 3 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 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 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 3 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 3 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 3 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 3 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 31, 2018 | Reporting Violations - Late Submittal of DMRs | ST6 |
| October 31, 2017 | 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.
Watch this permit
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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 MI0023167 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.