Grand Bayou Mobile Home Park Water Hardness & Quality Report (2026)

The water serving Grand Bayou Mobile Home Park in Thibodaux, Terrebonne Parish, Louisiana, likely comes from the parish's public supply system. This system draws about 5.20 million gallons daily from surface sources like Bayou Black, and an additional 0.61 million gallons daily from groundwater, mainly the Evangeline Aquifer. The majority of this water, 70%, is used for public supply. While the park doesn't have its own identified utility or treatment plant, it's part of Terrebonne Parish's water infrastructure, potentially connected to systems managed by the LDEQ. The watershed covers the Terrebonne Parish coastal plain, an area of wetlands and bayous within the Atchafalaya River Basin and Mississippi River Deltaic Plain.

Groundwater for the area is drawn from the Gulf Coast Aquifer System, specifically the Evangeline Aquifer, which is composed of Tertiary-age sands and clays interbedded with layers rich in carbonates. This geological makeup causes the water to be very hard. As the groundwater moves through these formations, it dissolves significant amounts of limestone and dolomitic materials. Unlike softer river systems, this groundwater lacks the dilution typically provided by surface runoff, leading to a naturally high mineral content.

Such very hard water can lead to considerable scale buildup in household plumbing, water heaters, dishwashers, and washing machines. This buildup not only reduces the efficiency of these appliances but also shortens their lifespan, often necessitating descaling every six to twelve months. You might notice laundry feeling stiff, soap not lathering well, and spots appearing on glassware after washing. To combat these issues, installing a water softener is highly recommended. Supplementing this with regular vinegar flushes for appliances and using low-flow fixtures can further help minimize scaling. While no specific local data on pH, lead, copper, or PFAS was found, USGS notes that groundwater in this region is very hard, and public systems typically use chlorination and basic filtration.