Clean Water Act discharge permit · NPDES MI0022594
CASS CITY WWTP, Cass City, MI: NPDES MI0022594 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 34Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
CASS CITY WWTP, held by Village of Cass City, holds NPDES permit MI0022594, which discharges to Cass River. EPA’s file records it issued December 27, 2023 and expiring October 1, 2027. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CASS CITY WWTP |
|---|---|
| Permittee as filed | Village of Cass City |
| NPDES ID | MI0022594 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 27, 2023 |
| Expiration date | October 1, 2027 |
| Issuing agency | State |
| Address | Cass City, MI 48726 |
| Receiving water | Cass River |
| Subwatershed | Cedar Run-White Creek (HUC 040802050205) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 35Pollutants on file
- 34Under a numeric limit
- 27With a violation of any kind
- 4With 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] | 14 | 89 | 12 | July 31, 2023 | 1,080% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 16 | 154 | 2 | June 30, 2025 | 18% over the limit |
| Phosphorus, total [as P] | 4 | 7 | 1 | April 30, 2026 | 4% over the limit |
| Chlorine, total residual | 1 | 5 | 1 | October 31, 2006 | 61% over the limit |
| Mercury, total [as Hg] | 6 | 202 | 0 | ||
| Oxygen, dissolved [DO] | 3 | 34 | 0 | ||
| Solids, total suspended | 8 | 16 | 0 | ||
| Solids, total | 3 | 9 | 0 | ||
| Arsenic, dry weight | 3 | 9 | 0 | ||
| Selenium, dry weight | 3 | 9 | 0 | ||
| Copper, dry weight | 3 | 9 | 0 | ||
| Cadmium, dry weight | 3 | 9 | 0 | ||
| Nitrogen, total Kjeldahl | 3 | 9 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 9 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 9 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 9 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 3 | 9 | 0 | ||
| Nitrogen, sludge, total, dry weight [as N] | 3 | 9 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 9 | 0 | ||
| Potassium, sludge, total, dry weight [as K] | 3 | 9 | 0 | ||
| Phosphorus, sludge, total, dry weight [as P] | 3 | 9 | 0 | ||
| pH | 2 | 8 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 8 | 0 | ||
| Coliform, fecal general | 2 | 8 | 0 | ||
| Silver, total [as Ag] | 0 | 6 | 0 | ||
| BOD, carb-5 day, 20 deg C, percent removal | 2 | 5 | 0 | ||
| Solids, suspended percent removal | 2 | 3 | 0 | ||
| Selenium, total [as Se] | 4 | 0 | 0 | ||
| Toxicity, choice of species | 2 | 0 | 0 | ||
| Static 48 Hr Chronic Pimphales Promelas | 2 | 0 | 0 | ||
| Chloride [as Cl] | 1 | 0 | 0 | ||
| Sulfate, total [as SO4] | 1 | 0 | 0 | ||
| Perfluorooctanesulfonate | 1 | 0 | 0 | ||
| Toxicity [acute], Ceriodaphnia dubia | 1 | 0 | 0 | ||
| TU Static 24 Hr Acute Pimephales promelas | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 17, 2023 | Management Practice Violations - No Licensed/Certified Operator | 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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Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.