MERRILL STP - Secondary Wastewater Treatment in Spaulding Township, Michigan

MERRILL STP is a municipal wastewater treatment plant located in Spaulding Township, Saginaw County, Michigan, United States. The facility serves a small population of 728 residents, providing secondary treatment to manage local wastewater. As a plant in the Great Lakes region, it plays a role in protecting the sensitive freshwater ecosystem. The plant operates under the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater. With a designed capacity of 529.96 megaliters and an annual discharge volume of 378.54 megaliters, the facility is sized to handle the community's needs. The treatment process meets federal standards for reducing organic pollutants and suspended solids. The treated effluent is discharged into local waterways that drain into the Saginaw River system, ultimately reaching Saginaw Bay and Lake Huron. This connection to the Great Lakes basin underscores the plant's importance in preventing nutrient pollution and protecting aquatic habitats in one of the world's largest freshwater systems.

The plant discharges into tributaries of the Saginaw River, which flows into Saginaw Bay, a shallow, nutrient-rich embayment of Lake Huron. The bay supports diverse fish populations and migratory waterfowl, making it ecologically sensitive to nutrient loading. The plant's secondary treatment helps reduce the risk of algal blooms and maintains water quality in this important Great Lakes ecosystem.