Lime Ridge STP - Advanced Wastewater Treatment in Lime Ridge, Wisconsin

Lime Ridge STP is a municipal wastewater treatment facility located in Lime Ridge, Sauk County, Wisconsin. The plant serves a small population of 170 residents, reflecting the rural character of the community. As an advanced treatment plant, it provides a higher level of pollutant removal beyond secondary treatment. The plant operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. For small agglomerations like Lime Ridge, advanced treatment is often implemented to meet stringent water quality standards, particularly in sensitive watersheds. The plant's designed capacity of 56.78 million gallons per year indicates it has room to accommodate future growth. The treated effluent from Lime Ridge STP is discharged into local waterways that ultimately drain into the Wisconsin River basin. The Wisconsin River flows southwesterly through the state, joining the Mississippi River near Prairie du Chien. This downstream connection makes the plant's advanced treatment important for protecting water quality in the larger Mississippi River system, which supports diverse aquatic life and serves as a major migratory corridor.

The plant discharges into the Wisconsin River watershed, which flows into the Mississippi River. The Mississippi River is a major ecological corridor supporting diverse fish, bird, and plant species. Advanced treatment at Lime Ridge STP helps reduce nutrient loading, protecting downstream water quality in this nationally significant river system.