Ligonier WWTP - Wastewater Treatment Plant in Ligonier, Indiana, USA

Ligonier WWTP is a municipal wastewater treatment facility located on Bridge Street in Ligonier, Noble County, Indiana. The plant serves a population of around 4,286 people, classifying it as a small to medium-sized treatment facility within the state's wastewater infrastructure. As a US-based plant, Ligonier WWTP operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Indiana Department of Environmental Management. For facilities of this scale, secondary treatment is typically required to meet effluent limits for biochemical oxygen demand and total suspended solids. The plant discharges treated wastewater into a local waterway that ultimately drains into the Lake Michigan basin via the St. Joseph River system. This connection to the Great Lakes watershed underscores the importance of effective nutrient removal to protect downstream aquatic ecosystems and drinking water sources.

Ligonier WWTP discharges into a tributary of the St. Joseph River, which flows into Lake Michigan. The Lake Michigan watershed supports diverse aquatic life, including native fish species and migratory birds. Nutrient loading from wastewater can contribute to algal blooms and hypoxia in the lake, making phosphorus and nitrogen management critical for ecological health.