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Clean Water Act discharge permit · NPDES MI0060278

ENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC, Mackinaw City, MI: NPDES MI0060278 discharge permit, effluent exceedances, inspections, penalties

ENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC, held by Enbridge Energy, Limited Partnership, holds NPDES permit MI0060278, which discharges to Lake Michigan. EPA’s file records it issued January 29, 2021 and expiring October 1, 2025.

ENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC, Mackinaw City, Michigan: Individual permit MI0060278, held by Enbridge Energy, Limited Partnership; Administratively continued (past its expiration date and still in force until reissued); issued January 29, 2021, term to October 1, 2025, by State; discharges to Lake Michigan.

  • Volume, total: 1 limit, 32 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 7 limits, 0 violations of any kind, 0 effluent exceedances.
  • pH: 6 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chloride [as Cl]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Solids, total dissolved: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oil & Grease: 3 limits, 0 violations of any kind, 0 effluent exceedances.
  • Equipment inspection - visual: 3 limits, 0 violations of any kind, 0 effluent exceedances.
  • Outfall observation,visual, y/n response: 3 limits, 0 violations of any kind, 0 effluent exceedances.
  • Temperature, water deg. fahrenheit: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Thermal Discharge: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Flow rate: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Toxicity [acute], Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Toxic Units Static 24 Hr Acute Ceriodaphnia dubia: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • TU Static 24 Hr Acute Daphnia magna: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • TU Static 24 Hr Acute Pimephales promelas: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oxygen, dissolved [DO]: 1 limit, 0 violations of any kind, 0 effluent exceedances.

ENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC among its neighbors

EPA’s permit file holds 2 discharge permits in the French Farm Creek-Frontal Trails End Bay subwatershed (HUC 040601050601), MI0060278 among them.

Identity

Facility as filedENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC
Permittee as filedEnbridge Energy, Limited Partnership
NPDES IDMI0060278
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJanuary 29, 2021
Expiration dateOctober 1, 2025
Issuing agencyState
AddressMackinaw City, MI 49701
Receiving waterLake Michigan
Receiving water impaired303(D) Listed
SubwatershedFrench Farm Creek-Frontal Trails End Bay (HUC 040601050601)

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Volume, total1320
Solids, total suspended700
pH600
Chloride [as Cl]400
Flow, in conduit or thru treatment plant400
Solids, total dissolved400
Oil & Grease300
Equipment inspection - visual300
Outfall observation,visual, y/n response300
Temperature, water deg. fahrenheit200
Thermal Discharge200
Flow rate200
Toxicity [acute], Ceriodaphnia dubia200
Toxic Units Static 24 Hr Acute Ceriodaphnia dubia200
TU Static 24 Hr Acute Daphnia magna200
TU Static 24 Hr Acute Pimephales promelas200
Oxygen, dissolved [DO]100

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MI0060278.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MI0060278.

Inspections

EPA’s inspection file holds no inspection for NPDES MI0060278.

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 MI0060278.

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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

What this page shows

This public-records page covers Clean Water Act NPDES permit MI0060278 for ENBRIDGE ENERGY-LINE 5-STRAITS OF MACKINAC in Mackinaw City, MI, held by Enbridge Energy, Limited Partnership, with discharge to Lake Michigan. The permit is listed as administratively continued, a Minor discharger class, with 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance. The file records issuance on January 29, 2021 and expiration on October 1, 2025, with status as of September 15, 2026.