Clean Water Act discharge permit · NPDES MI0020591
ST CLAIR WWTP, St. Clair, MI: NPDES MI0020591 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
ST CLAIR WWTP, held by City of St. Clair, holds NPDES permit MI0020591, which discharges to Pine River. EPA’s file records it issued September 30, 2014 and expiring October 1, 2018. 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 | ST CLAIR WWTP |
|---|---|
| Permittee as filed | City of St. Clair |
| NPDES ID | MI0020591 |
| 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, 2014 |
| Expiration date | October 1, 2018 |
| Issuing agency | State |
| Address | St. Clair, MI 48079 |
| Receiving water | Pine River |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Pine River (HUC 040900010306) |
| Other EPA IDs (FRS) | RCRA handler MID985569862 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 27Pollutants on file
- 26Under a numeric limit
- 27With 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 |
|---|---|---|---|---|---|
| Mercury, total [as Hg] | 6 | 43 | 6 | January 31, 2014 | 41% over the limit |
| Copper, total [as Cu] | 0 | 9 | 3 | March 31, 2009 | 24% over the limit |
| Solids, total suspended | 4 | 17 | 1 | December 31, 2016 | 10% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 17 | 1 | December 31, 2016 | 10% over the limit |
| Phosphorus, total [as P] | 4 | 11 | 1 | May 31, 2011 | 169% over the limit |
| Cadmium, dry weight | 3 | 7 | 1 | September 30, 2016 | 36,135% over the limit |
| pH | 2 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 8 | 0 | ||
| Coliform, fecal general | 2 | 8 | 0 | ||
| Solids, total | 3 | 6 | 0 | ||
| Arsenic, dry weight | 3 | 6 | 0 | ||
| Selenium, dry weight | 3 | 6 | 0 | ||
| Copper, dry weight | 3 | 6 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 6 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 6 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 6 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 6 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 6 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 6 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 6 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 6 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 6 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 5 | 0 | ||
| Solids, suspended percent removal | 2 | 5 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 4 | 0 | ||
| Chlorine, total residual | 1 | 4 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 10, 2025 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| June 6, 2023 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| June 6, 2023 | Pretreatment - Failure to Develop/Enforce Standards | ST6 |
| June 6, 2023 | Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II) | ST6 |
| November 30, 2022 | Reporting Violations - Late Submittal of DMRs | ST6 |
| August 23, 2022 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 11, 2020 | WW SSO - Discharge to Waters | ST6 |
| January 11, 2020 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | ST6 |
| September 18, 2019 | Reporting Violations - Failure to Notify | 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 MI0020591 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.