Solon Springs STP - Secondary Wastewater Treatment in Solon Springs, Wisconsin

Solon Springs STP is a municipal wastewater treatment facility located in Solon Springs, Douglas County, Wisconsin. The plant serves a small community of approximately 870 people, providing essential sanitation services for the village and surrounding area. The plant operates at the secondary treatment level, which is standard for small to medium agglomerations in the United States under the Clean Water Act. With a designed capacity of 446.68 volume units and an average discharge of 340.69 volume units, the facility maintains a utilization rate consistent with typical seasonal and population demands. Treatment processes meet EPA secondary treatment standards for biochemical oxygen demand and total suspended solids. The treated effluent is discharged into receiving waters that ultimately flow into the Lake Superior watershed, one of the largest freshwater ecosystems in the world. The plant's location more than 10 km from the coast but within 50 km means its discharge contributes to the health of regional streams and rivers that support diverse aquatic life and recreational uses.

The plant discharges into local tributaries that drain into the Lake Superior basin, a vast freshwater system with significant ecological importance. The watershed supports coldwater fisheries, including trout and salmon species, and provides habitat for migratory waterfowl. Protecting water quality in this region is critical for maintaining the lake's oligotrophic status and the ecosystem services it provides to surrounding communities.