Belle Chasse Water Hardness & Quality Report (2026)

Belle Chasse, Louisiana, in Plaquemines Parish — a Plaquemines Parish community adjacent to Harvey and Gretna on the Mississippi River in southeast Louisiana — receives its water from the Plaquemines Parish Water, drawing from the Mississippi River (Plaquemines Parish) through the southeast Louisiana distribution.

The very soft 40.5 mg/L hardness and very low TDS of 62.8 mg/L reflect the very soft lower Mississippi River delta supply — at Plaquemines Parish, the Mississippi River has lost nearly all hardness from the upper basin's calcareous contributions through sediment settling and dilution by the massive delta flow, producing very soft water despite the long upstream calcareous contact (compare Crowley LA: 67/153 on the Vermilion Bayou supply; Belle Chasse far softer from the diluted lower Mississippi delta). The lower Mississippi at Plaquemines Parish — Quaternary alluvial silt (insoluble — primary dilutant), Holocene delta sediment (insoluble — secondary dilutant), and minimal dissolved calcareous salts (slightly calcareous — trace hardness).

At 40.5 mg/L, Belle Chasse's water is very soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 5.6 ppt warrants a certified drinking water filter — the Plaquemines Parish southeast Louisiana petrochemical corridor contribute to Belle Chasse's readings.