Clean Water Act discharge permit · NPDES MI0025585
CHAPATON RTB, Saint Clair Shores, MI: NPDES MI0025585 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
- 1Inspections on file
- 0Formal enforcement actions
CHAPATON RTB, held by 8 1/2 Mile Relief Drain Drainage District, holds NPDES permit MI0025585, which discharges to Chapaton Canal. EPA’s file records it issued September 27, 2018 and expiring October 1, 2022. 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 | CHAPATON RTB |
|---|---|
| Permittee as filed | 8 1/2 Mile Relief Drain Drainage District |
| NPDES ID | MI0025585 |
| 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 | September 27, 2018 |
| Expiration date | October 1, 2022 |
| Issuing agency | State |
| Address | Saint Clair Shores, MI 48080 |
| Receiving water | Chapaton Canal |
| Subwatershed | Clinton River Spillway-Frontal Lake Saint Clair (HUC 040900020200) |
| Other EPA IDs (FRS) | RCRA handler MID985576503 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 10Pollutants on file
- 9Under a numeric limit
- 10With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 0 | 53 | 1 | July 31, 2010 | 1,002% over the limit |
| Chlorine, total residual | 2 | 41 | 1 | December 31, 2021 | 5% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 82 | 0 | ||
| Solids, total suspended | 2 | 78 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 78 | 0 | ||
| Phosphorus, total [as P] | 2 | 78 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 2 | 78 | 0 | ||
| pH | 2 | 40 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 20 | 0 | ||
| E. coli | 2 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MI0025585.
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| August 18, 2026 | Evaluation | 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 |
|---|---|---|
| August 31, 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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MI0025585.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
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How we handle your data → Privacy
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 MI0025585 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.