Mackinaw City WWTP
Mackinaw City, MI · Cheboygan County · Publicly Owned Treatment Works
- Average flow
- 0.31 MGD
- Design flow
- —
- NPDES permit
- MIG570151
- Administratively continued
- Permit expires
- April 2025
- Population served
- 623
- CWNS 2022
Mackinaw City WWTP is a publicly owned wastewater treatment works in Mackinaw City, Cheboygan County, Michigan treating an average of 0.31 million gallons per day, serving about 623 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit MIG570151 (administratively continued), which expires in April 2025, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Mackinaw City
Mackinaw City's capital improvement plan lists 14 water, sewer and wastewater line items worth $5M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Mackinaw City →
| Project | Budget | Years |
|---|---|---|
| Replacement of Force Main 11340ft | $1,200,000 | 2029–2029 |
| Sanitary Sewer Rehabilitation Phase I (2) | $850,000 | 2025–2025 |
| Water Transmission Improvements | $750,000 | 2025–2025 |
| Wastewater Treatment Plant Upgrades (2) | $600,000 | 2025–2025 |
| Sanitary Sewer Rehabilitation Phase II | $450,000 | 2029–2029 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Mackinaw City WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Michigan
Mackinac Island · 8 mi away
0.54 MGD
Saint Ignace · 10 mi away
0.29 MGD
Cheboygan · 15 mi away
0.84 MGD
Petoskey · 29 mi away
1.03 MGD
Rudyard · 33 mi away
—
Onaway · 37 mi away
—
Kincheloe · 37 mi away
0.45 MGD
Boyne City · 40 mi away
0.62 MGD
Mackinaw City 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 April 4, 2025.