Baytown Water Hardness & Quality Report (2026)

Baytown, Texas, in Harris County on Galveston Bay's Trinity Bay arm — a major petrochemical industrial city home of ExxonMobil's Baytown refinery complex — draws its municipal water supply from Lake Livingston (a Trinity River Authority impoundment on the Trinity River in Polk County) via the City of Baytown Water Division and the Trinity River Authority of Texas (TRA) regional water supply system. Lake Livingston is one of Texas's largest reservoirs and the primary water supply for the greater Houston–Baytown area. Water hardness in Baytown measures 131 mg/L — classified as moderately hard.

Baytown's moderate hardness from the Lake Livingston–Trinity River supply reflects the Trinity River watershed's East Texas geology. The Trinity River drains: the North-Central Texas Cretaceous Austin Chalk and Taylor Marl (highly calcareous chalk and marl — major dissolved calcium source through the Waco–Dallas drainage); the Eocene Wilcox Group (calcareous sand and clay of the East Texas coastal plain); and the Quaternary terrace deposits of the Trinity Valley. By Lake Livingston, the Trinity River has accumulated moderate dissolved mineral content from the calcareous chalk and marl terrain of north-central Texas, reduced somewhat by the large reservoir's dilution and residence time. The finished hardness at Baytown's distribution is typical for Houston-area Trinity River supply.

At 131 mg/L, Baytown residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. City of Baytown Water Division and Trinity River Authority consistently deliver water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.