Mackinac Island WWTP
Mackinac Island, MI · Mackinac County · Publicly Owned Treatment Works
- Average flow
- 0.54 MGD
- Design flow
- —
- NPDES permit
- MI0026751
- Effective
- Permit expires
- October 2028
- Population served
- 482
- CWNS 2022
Mackinac Island WWTP is a publicly owned wastewater treatment works in Mackinac Island, Mackinac County, Michigan treating an average of 0.54 million gallons per day, serving about 482 residents. Treatment on site includes clarifiers. It discharges under NPDES permit MI0026751 (effective), which expires in October 2028, with 129 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 129
- Effluent violations
- 100
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Mackinac Island WWTP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Mackinac Island WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Saint Ignace · 6 mi away
0.29 MGD
Mackinaw City · 8 mi away
0.31 MGD
Cheboygan · 16 mi away
0.84 MGD
Rudyard · 25 mi away
—
Kincheloe · 29 mi away
0.45 MGD
Petoskey · 37 mi away
1.03 MGD
Brimley · 37 mi away
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Onaway · 40 mi away
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Mackinac Island WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated May 19, 2025.