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Soils & Structures

Mackinac Island WWTP Improvements

WWTP 2
WWTP 2
  • November 11, 2025

Project Title: Mackinac Island Waste Water Treatment Plant Improvements
Location: Mackinac Island, Michigan
Description of Work: Construction Materials Testing, Steel Inspection
Value: $78.7 M

The WWTP Improvement Project aims to expand and modernize the wastewater treatment plant, with major upgrades like automated screening, grit removal and advanced treatment systems such as moving bed biofilm reactors and UV disinfection. Expanded capacity will allow the plant to handle seasonal surges in wastewater, while new pumps, blowers and controls will improve water quality and stormwater management.

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  • Services
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    • Laboratory Testing
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  • Resources
    • State Registrations
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