Clean Water Act discharge permit · NPDES MI0024058
SAULT STE MARIE WWTP, Sault Ste Marie, MI: NPDES MI0024058 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 30Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
- 5Inspections on file
- 0Formal enforcement actions
SAULT STE MARIE WWTP, held by City of Sault Ste. Marie, holds NPDES permit MI0024058. EPA’s file records it issued March 27, 2018 and expiring October 1, 2020.
SAULT STE MARIE WWTP, Sault Ste Marie, Michigan: Individual permit MI0024058, held by City of Sault Ste. Marie; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued March 27, 2018, term to October 1, 2020, by State; Sewage Treatment Facilities.
- Mercury, total [as Hg]: 6 limits, 73 violations of any kind, 25 effluent exceedances, latest December 31, 2023, largest 123% over the limit.
- Coliform, fecal general: 2 limits, 30 violations of any kind, 24 effluent exceedances, latest July 31, 2026, largest 297% over the limit.
- Solids, suspended percent removal: 4 limits, 40 violations of any kind, 22 effluent exceedances, latest June 30, 2026, largest 94% over the limit.
- BOD, carb-5 day, 20 deg C, percent removal: 4 limits, 29 violations of any kind, 11 effluent exceedances, latest June 30, 2026, largest 48% over the limit.
- Phosphorus, total [as P]: 4 limits, 18 violations of any kind, 11 effluent exceedances, latest July 31, 2026, largest 3,700% over the limit.
- Copper, total [as Cu]: 2 limits, 12 violations of any kind, 8 effluent exceedances, latest June 30, 2023, largest 365% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 9 violations of any kind, 6 effluent exceedances, latest September 30, 2020, largest 43% over the limit.
- Chlorine, total residual: 1 limit, 9 violations of any kind, 5 effluent exceedances, latest July 31, 2020, largest 37% over the limit.
- pH: 2 limits, 9 violations of any kind, 3 effluent exceedances, latest October 31, 2022.
- Solids, total suspended: 4 limits, 13 violations of any kind, 1 effluent exceedance, latest March 31, 2020, largest 1% over the limit.
- TU Static 24 Hr Acute Pimephales promelas: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest July 31, 2025, largest 10% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 4 limits, 12 violations of any kind, 0 effluent exceedances.
- Solids, total: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Arsenic, dry weight: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Selenium, dry weight: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Copper, dry weight: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Cadmium, dry weight: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Nitrogen, total Kjeldahl: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Nickel, sludge, total, dry weight [as Ni]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Nitrogen, sludge, total, dry weight [as N]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Potassium, sludge, total, dry weight [as K]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Phosphorus, sludge, total, dry weight [as P]: 3 limits, 6 violations of any kind, 0 effluent exceedances.
- Cyanide [A]: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Flow, in conduit or thru treatment plant: 2 limits, 6 violations of any kind, 0 effluent exceedances.
- Nitrogen, ammonia total [as N]: 2 limits, 2 violations of any kind, 0 effluent exceedances.
- TU Static 24 Hr Acute Daphnia magna: 2 limits, 0 violations of any kind, 0 effluent exceedances.
- October 15, 2026: Reconnaissance without Sampling (S).
- September 21, 2026: Reconnaissance without Sampling (S).
- June 15, 2026: Reconnaissance without Sampling (S).
- March 24, 2026: Reconnaissance without Sampling (S).
- January 11, 2026: Reconnaissance without Sampling (S).
- June 21, 2021: Reporting Violations - Late Submittal of DMRs (ST6).
- October 31, 2020: Reporting Violations - Late Submittal of DMRs (ST6).
- April 21, 2020: Reporting Violations - Late Submittal of DMRs (ST6).
- February 10, 2020: Management Practice Violations - No Licensed/Certified Operator (ST6).
- August 17, 2017: Permit Violations - Discharge Without a Valid Permit (ST6).
Michigan holds 200 Publicly owned treatment works coverages of this permit type in EPA’s file; 88 were issued before MI0024058.
Coverages issued nearest MI0024058
- December 31, 2017: HOLLY WWTP, Holly, MI0020184, held by Village of Holly
- January 31, 2018: FLUSHING WWTP, Flushing, MI0020281, held by City of Flushing
- February 6, 2018: ST IGNACE WWTP, St. Ignace, MI0020699, held by City of St. Ignace
- February 9, 2018: OAKLAND CO WALLED LK NOVI WWTP, Novi, MI0024287, held by Oakland County Water Resources Commissioner
- February 22, 2018: YCUA REGIONAL WWTP, Ypsilanti, MI0042676, held by Ypsilanti Community Utilities Authority
- March 27, 2018: HOWELL TWP WWTP, Howell, MI0055727, held by Howell Township
- April 27, 2018: SAGINAW WWTP, Saginaw, MI0025577, held by City of Saginaw
- July 27, 2018: MONROE METRO WWTP, Monroe, MI0028401, held by City of Monroe
- August 28, 2018: NEWAYGO WWTP, Newaygo, MI0048577, held by City of Newaygo
- August 28, 2018: PRESCOTT WWTP, Prescott, MI0057529, held by Village of Prescott
SAULT STE MARIE WWTP among its neighbors
EPA’s permit file holds 7 discharge permits in the Frechette Creek-Frontal Saint Marys River subwatershed (HUC 040700010101), MI0024058 among them.
Other permits in the Frechette Creek-Frontal Saint Marys River subwatershed (HUC 040700010101)
- AGGRESSIVE MFG INNOVATION, Sault Sainte Marie: MIS111667, minor permit, discharging to Ashmun Creek, permit term to April 1, 2026
- MDMVA-SAULT STE MARIE, Sault Ste Marie: MIS111746, minor permit, discharging to St. Marys River, permit term to April 1, 2026
- ODENAANG SUBDIVISION, Sault Ste. Marie: MIR10I00Y, minor permit, permit term to February 16, 2027
- SAULT STE MARIE CARBIDE DOCK, Sault Ste Marie: MIS111813, minor permit, permit term to April 1, 2021
- SAULT STE. MARIE ODANAANG, Sault Sainte Marie: MI0057087, minor permit, permit term to September 2, 2014
- US ARMY-ST MARYS FALLS CANAL, Sault Ste. Marie: MIG250550, minor permit, discharging to St. Marys River, permit term to April 1, 2028
Identity
| Facility as filed | SAULT STE MARIE WWTP |
|---|---|
| Permittee as filed | City of Sault Ste. Marie |
| NPDES ID | MI0024058 |
| 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 27, 2018 |
| Expiration date | October 1, 2020 |
| Issuing agency | State |
| Address | Sault Ste Marie, MI 49783 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Frechette Creek-Frontal Saint Marys River (HUC 040700010101) |
| Program components on file | Biosolids, CSO, POTW |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler MID985568005 |
Effluent limits and exceedances
- 30Pollutants on file
- 30Under a numeric limit
- 29With a violation of any kind
- 11With 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 | 73 | 25 | December 31, 2023 | 123% over the limit |
| Coliform, fecal general | 2 | 30 | 24 | July 31, 2026 | 297% over the limit |
| Solids, suspended percent removal | 4 | 40 | 22 | June 30, 2026 | 94% over the limit |
| BOD, carb-5 day, 20 deg C, percent removal | 4 | 29 | 11 | June 30, 2026 | 48% over the limit |
| Phosphorus, total [as P] | 4 | 18 | 11 | July 31, 2026 | 3,700% over the limit |
| Copper, total [as Cu] | 2 | 12 | 8 | June 30, 2023 | 365% over the limit |
| Oxygen, dissolved [DO] | 1 | 9 | 6 | September 30, 2020 | 43% over the limit |
| Chlorine, total residual | 1 | 9 | 5 | July 31, 2020 | 37% over the limit |
| pH | 2 | 9 | 3 | October 31, 2022 | |
| Solids, total suspended | 4 | 13 | 1 | March 31, 2020 | 1% over the limit |
| TU Static 24 Hr Acute Pimephales promelas | 2 | 1 | 1 | July 31, 2025 | 10% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 4 | 12 | 0 | ||
| Solids, total | 3 | 6 | 0 | ||
| Arsenic, dry weight | 3 | 6 | 0 | ||
| Selenium, dry weight | 3 | 6 | 0 | ||
| Copper, dry weight | 3 | 6 | 0 | ||
| Cadmium, 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 | ||
| Cyanide [A] | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 2 | 0 | ||
| TU Static 24 Hr Acute Daphnia magna | 2 | 0 | 0 |
Inspections, violations and enforcement
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 21, 2021 | Reporting Violations - Late Submittal of DMRs | ST6 |
| October 31, 2020 | Reporting Violations - Late Submittal of DMRs | ST6 |
| April 21, 2020 | Reporting Violations - Late Submittal of DMRs | ST6 |
| February 10, 2020 | Management Practice Violations - No Licensed/Certified Operator | ST6 |
| August 17, 2017 | Permit Violations - Discharge Without a Valid Permit | ST6 |
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| October 15, 2026 | Reconnaissance without Sampling | S |
| September 21, 2026 | Reconnaissance without Sampling | S |
| June 15, 2026 | Reconnaissance without Sampling | S |
| March 24, 2026 | Reconnaissance without Sampling | S |
| January 11, 2026 | Reconnaissance without Sampling | 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
EPA’s informal enforcement file holds no action for NPDES MI0024058.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.