Tekonsha Lagoon Wastewater Treatment Plant - Tekonsha Township, Michigan

Tekonsha Lagoon is a municipal wastewater treatment facility located in Tekonsha Township, Calhoun County, Michigan. The plant serves a small population of 824 residents, reflecting the rural character of the area. It operates as a lagoon system, a common treatment approach for small communities in the Midwest. The plant provides secondary treatment, which is the minimum standard required under the U.S. Clean Water Act for municipal wastewater facilities. With a designed capacity of 503.46 volume units and an average discharge volume of 435.32 volume units, the facility operates below its design capacity. As a publicly owned treatment works (POTW), it is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent from Tekonsha Lagoon is discharged into a local water body that ultimately drains into the St. Joseph River watershed, which flows into Lake Michigan. The plant's location inland and away from the Great Lakes coast reduces direct impact on sensitive coastal ecosystems, but its discharge still contributes to the overall nutrient load in the watershed.

Tekonsha Lagoon discharges into a tributary of the St. Joseph River, which flows westward through southern Michigan and northern Indiana before entering Lake Michigan near Benton Harbor. The St. Joseph River watershed supports diverse aquatic life, including game fish species such as walleye and smallmouth bass. The plant's secondary treatment helps reduce organic pollutants, but nutrient removal is limited, which can contribute to algal growth in downstream waters. The region's agricultural land use also adds nutrient runoff, making the cumulative impact on Lake Michigan's water quality a concern.