Harahan STP Wastewater Treatment Plant, Harahan, Louisiana

Harahan STP is a municipal wastewater treatment plant located in Harahan, Jefferson Parish, Louisiana. The facility serves a population of around 10,000 residents in this suburban community near New Orleans. As a U.S. plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The plant has a designed capacity of 1.00 million gallons per day. plants of this scale typically employ secondary treatment as a minimum, which includes biological processes to reduce organic matter and suspended solids. The plant's discharge is regulated by the Louisiana Department of Environmental Quality (LDEQ) under the state's NPDES program. The treated effluent from Harahan STP is discharged into the Mississippi River, which flows into the Gulf of Mexico. The Mississippi River is a major waterway that supports diverse aquatic life and provides drinking water for millions. The plant's discharge contributes to the overall nutrient load in the river, which can impact downstream ecosystems, including the hypoxic zone in the Gulf of Mexico.

Harahan STP discharges into the Mississippi River, which flows south through Louisiana and into the Gulf of Mexico. The Mississippi River basin is one of the largest in North America, supporting a wide range of aquatic species and providing critical habitat for migratory birds. Downstream, the river's nutrient inputs contribute to seasonal hypoxia in the Gulf of Mexico, a significant ecological concern. The plant's location in a densely populated region near New Orleans means its effluent quality is important for maintaining the river's health and the downstream marine environment.