Calcasieu SD 11 - Projected Advanced Wastewater Treatment Plant in Calcasieu Parish, Louisiana

Calcasieu SD 11 is a planned advanced wastewater treatment facility located in Calcasieu Parish, Louisiana, United States. Designed to serve a population of 3,200, the plant will provide advanced treatment to meet stringent environmental standards for its discharge. As a projected facility, Calcasieu SD 11 will operate under the U.S. Clean Water Act, requiring an NPDES permit issued by the Louisiana Department of Environmental Quality. Advanced treatment ensures removal of nutrients and other pollutants beyond secondary levels, which is typical for sensitive watersheds or areas with high water quality standards. The plant's treated effluent will be discharged into local waterways within the Calcasieu River basin, which drains into the Gulf of Mexico. This region supports diverse aquatic ecosystems and is important for fisheries and coastal habitats. The advanced treatment helps protect downstream water quality and ecological health.

The plant discharges into the Calcasieu River basin, which flows through southwestern Louisiana and empties into the Gulf of Mexico. This watershed supports a variety of aquatic life, including fish and shellfish, and is part of a larger coastal ecosystem that includes marshes and estuaries. Advanced treatment reduces nutrient loading, helping to prevent eutrophication and protect downstream habitats.