CROWLEY STP Wastewater Treatment Plant, Acadia Parish, Louisiana

CROWLEY STP is a municipal wastewater treatment plant located in Acadia Parish, Louisiana, serving a population of about 14,557. The facility is situated inland, more than 50 kilometers from the coast, and its operations are subject to the U.S. Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting. As a plant serving a medium-sized agglomeration, CROWLEY STP is expected to provide at least secondary treatment under federal regulations. The treatment process typically involves biological treatment to reduce organic matter and suspended solids, ensuring compliance with discharge limits set by the Louisiana Department of Environmental Quality. The treated effluent is discharged into local waterways that drain into the Gulf of Mexico via the Mississippi River or its distributaries. The plant plays a key role in protecting the region's aquatic ecosystems, including wetlands and bayous that support diverse wildlife and fisheries.

The plant's discharge enters the Mermentau River basin, which flows into the Gulf of Mexico. This watershed supports a network of coastal marshes and estuaries that are critical for migratory birds, fish, and shellfish. Protecting water quality in this region helps maintain the ecological health of the Gulf's productive marine environment.