Thibodaux Water Hardness & Quality Report (2026)

Thibodaux, Louisiana, in Lafourche Parish — the Lafourche Parish seat on Bayou Lafourche adjacent to Houma and Raceland in the southeast Louisiana Cajun region — receives its water from the Thibodaux Water Division, drawing from Bayou Lafourche or the Mississippi River Alluvial Aquifer (Lafourche Parish) through the southeast Louisiana water treatment system.

The moderately hard 108.5 mg/L hardness and TDS of 233.6 mg/L reflect the southeast Louisiana Bayou Lafourche supply's moderate character — harder than simple alluvial aquifer communities (Blytheville AR: 74.5 mg/L) and reflecting the Mississippi River calcareous sediment influence mixed with slight coastal saline input at the Bayou Lafourche position. Bayou Lafourche at Lafourche Parish carries water from the Mississippi River origin — Holocene Mississippi delta alluvium (near-insoluble, siliceous), calcareous suspended sediment contribution from the upper Mississippi calcareous watershed, and slight coastal saline mineral enrichment at the lower Bayou Lafourche position.

At 108.5 mg/L, Thibodaux's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 10.2 ppt warrants a certified reverse osmosis drinking water filter — Naval Air Station Pensacola (Escambia County FL — AFFF, regional Gulf PFAS corridor), Barksdale Air Force Base (Bossier City LA — AFFF), and the southeast Louisiana petrochemical industrial corridor contribute to Thibodaux's elevated readings.