Metairie Water Hardness & Quality Report (2026)

The Jefferson Parish Department of Water provides drinking water to Metairie and the East and West Banks of Jefferson Parish, Louisiana. The utility draws surface water from the Mississippi River, pumped from large river stations to the East Bank's four water purification plants. Primary sources include the Mississippi River; groundwater from the Norco and Gonzales-New Orleans aquifers serves as secondary or historical supply. The system serves residences, businesses, and industries across the parish, operating multiple purification plants for large-scale treatment and distribution.

The Mississippi River watershed spans 31 US states and 2 Canadian provinces, with geology dominated by Paleozoic and Mesozoic sedimentary rocks including Mississippian limestones and Cretaceous chalks that weather to release calcium and magnesium. Alluvial sediments in the lower delta are Quaternary sands and clays overlying Tertiary formations. This limestone-influenced geology yields a moderately hard supply, with purification processes including softening moderating the final mineral content for distribution.

Moderate hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and causing spotting on glassware. Regular vinegar descaling, sediment filters, and a water softener are recommended to extend appliance life and improve performance. The 2022 Consumer Confidence Report confirms safe drinking water compliant with pH, chloride, sulfate, and iron standards; Jefferson Parish meets lead and copper rules. Source water contaminants including mercury, PCBs, nutrients, and arsenic are addressed via coagulation, filtration, disinfection, and softening at purification plants.