Louisiana's most expansive parish faces a 55% land loss by 2074
In short: Plaquemines Parish is the largest in Louisiana by total area, yet it is defined by what isn't there: incorporated communities. This low-lying expanse serves as a critical gateway for global trade and energy, but it faces an existential threat from rising sea levels that could erase over half its land.
Spanning 2,567 square miles, Plaquemines Parish is geographically dominated by water, which accounts for 70% of its total area. Despite its size, the parish has no incorporated communities; instead, it consists of numerous census-designated places like Belle Chasse and Pointe à la Hache. The final 70 miles of the Mississippi River before entering the Gulf of Mexico are contained within this industrial zone. Serving as a hub for offshore support bases and oil refineries, it also marked the initial US location where international trade involved containers.
The region's history is marked by extreme environmental volatility and industrial concentration. It has been devastated by multiple hurricanes, including Katrina in 2005—where it was the initial landfall site with a Category 5 storm surge exceeding 20 feet—and significant floods in 1915 and 1927. Furthermore, research indicates that Louisiana has one of the highest concentrations of petrochemical industry in the U.S. Systematic reviews of environmental health suggest that residents living closer to these industrial activities face higher pollution exposure and worse health outcomes, with Black and lower-income populations disproportionately affected by this burden.
The future of Plaquemines is precarious. Projections indicate that rising oceans could submerge 55% of the parish's existing territory during the coming 50 years if no major actions occur. This physical erosion is compounded by infrastructure challenges; for example, onsite wastewater treatment units (ATUs) in coastal parishes are estimated to contribute nearly half of the nitrogen and 84% of the phosphorus discharged by major plants in Louisiana, highlighting a pressing need for improved management in these vulnerable environments.
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Sources
- Summary by Intellect · source: Plaquemines Parish, Louisiana
- Also: Environmental science & technology — Aerobic Treatment Units for Widespread Onsite Wastewater Treatment in Coastal Louisiana: Pollution, Policy, and Market-Based Solutions. · CC BY
- Also: Industrial Pollution and Health in Louisiana: A Systematic Review of Quantitative and Qualitative Studies.
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