Houma Water Hardness & Quality Report (2026)

Houma, Louisiana, the Terrebonne Parish seat — a major south Louisiana coastal community (Houma is the Terrebonne Parish seat and the primary urban center of the Bayou Teche and Lafourche–Terrebonne coastal region — one of the most geologically unique urban areas in the United States, with much of the surrounding region below sea level and subject to dramatic coastal erosion), a major center of the Louisiana offshore oil and gas industry (Houma is the primary land base and services hub for a significant portion of the Gulf of Mexico offshore oil and gas production — hundreds of offshore supply and crew boats operate out of the Houma–Terrebonne Port), a diverse Terrebonne Parish community with a significant Cajun, Native American (the United Houma Nation), Vietnamese-American, and African-American population, and a community at the front lines of Louisiana's dramatic coastal land loss — draws its municipal water supply via the Terrebonne Parish Consolidated Government Water Division. Water hardness in Houma measures 111.5 mg/L — classified as moderately hard.

Houma's moderate hardness reflects the Terrebonne Parish Mississippi River deltaic plain geology. The Bayou Terrebonne and Intracoastal Waterway at Houma draw from: the Holocene Mississippi River deltaic plain alluvium (calcareous-moderate Mississippi River-deposited clay and sand); and surface water supply influenced by the brackish Terrebonne basin (the increasingly brackish nature of the south Louisiana bayou system due to subsidence and saltwater intrusion). Terrebonne Parish treatment produces the moderate 111.5 mg/L.

At 111.5 mg/L, Houma residents encounter moderate scale accumulation. Monthly cleaning with citric acid solution is recommended. Terrebonne Parish Consolidated Government Water Division consistently delivers water meeting all Louisiana DEQ and EPA Safe Drinking Water Act requirements.