Laplace Water Hardness & Quality Report (2026)

The St. John the Baptist Parish Utilities Department provides drinking water to LaPlace and surrounding areas in St. John the Baptist Parish, Louisiana, within the New Orleans metropolitan region. Raw water is pumped from two groundwater wells located near Ruddock, approximately 10 miles from the LaPlace Water Treatment facility. Well water enters at temperatures around 95°F and undergoes standard treatment before distribution throughout the parish. The service area encompasses the broader community of LaPlace, relying entirely on local aquifer sources with no surface water intake identified in available records.

The supply draws from two key aquifers in southeastern Louisiana — the Gramercy aquifer and the upper portion of the Gonzales-New Orleans aquifer — both components of the Mississippi River alluvial aquifer system. These aquifers consist of unconsolidated sands, gravels, and silts of Quaternary and Tertiary age, with hydraulic connections to the Mississippi River. Dissolved calcium and magnesium from limestone and sedimentary formations impart a moderately mineralised character; hardness increases with greater connectivity to river-influenced zones where mineral dissolution from alluvial deposits is enhanced.

Moderately hard water can produce scale buildup in pipes, water heaters, and dishwashers, reducing efficiency over time. Laundry may feel stiffer and soap lathering is less effective, requiring more detergent. Periodic descaling of appliances and fixtures is advised; a water softener is recommended to mitigate these effects and extend equipment life. USGS data shows pH ranging from 7.0 to 7.7 in the Gramercy aquifer and 7.7 to 8.4 in the Gonzales-New Orleans aquifer, with some wells exceeding EPA secondary standards for color, total dissolved solids, and iron. No specific lead, copper, or PFAS data was identified; treatment involves standard processing of warm well water at the LaPlace facility.