Chalmette Water Hardness & Quality Report (2026)

The St. Bernard Parish Waterworks serves Chalmette and St. Bernard Parish, Louisiana, providing drinking water to approximately 44,611 residents. The utility sources its supply from surface water, specifically the Mississippi River, with about 260 million gallons per day withdrawn as noted in USGS reports. The main facility is located at 8201 W Judge Perez Drive, Chalmette, LA 70043, managed by Superintendent Jacob Groby. Treatment involves conventional processes for surface water, including coagulation, sedimentation, filtration, and disinfection to meet EPA standards.

The Mississippi River watershed encompasses over 1.2 million square miles, draining from the Rockies to the Gulf of Mexico. In the St. Bernard Parish area, the supply interacts with shallow point-bar deposits and New Orleans-area aquifers, featuring unconsolidated sands from Quaternary alluvium. These sedimentary layers, influenced by upstream limestone dissolution, impart a moderately mineralised character to the water, elevating certain ions without extreme concentrations. The deltaic geology moderates the chemistry through sediment buffering. The Mississippi River's geology is characterized by Quaternary point-bar deposits and Holocene floodplain sediments, which contribute to the water's mineral content.

When it comes to household appliances, the moderately hard water can cause scale buildup, reducing efficiency in water heaters, dishwashers, and washing machines. To mitigate these issues, homeowners can try regular descaling with vinegar, installing drain screens, and flushing heaters biannually. A water softener is often recommended for households to prevent spotting on dishes and dry skin or hair. The Louisiana Department of Health rated the system 88/100 in 2022, indicating good overall compliance, but precautionary boil water advisories may occur during pressure drops below 20 psi from line breaks.