North Richland Hills Water Hardness & Quality Report (2026)

North Richland Hills, Texas, in Tarrant County northeast of Fort Worth — a major DFW Metroplex suburban city in the mid-cities corridor between Fort Worth and Dallas — draws its municipal water supply from the Tarrant Regional Water District (TRWD) reservoirs, including Eagle Mountain Lake and Lake Bridgeport (West Fork Trinity River system) via the City of North Richland Hills Water Division. The West Fork Trinity River system drains the Blackland Prairie of Tarrant County. Water hardness in North Richland Hills reaches 314 mg/L — classified as very hard.

North Richland Hills's very hard supply reflects the Tarrant County Trinity River watershed's exceptional Central Texas carbonate geology — among the most calcareous terrain in North America. The Eagle Mountain Lake and Lake Bridgeport watershed drains: the Texas Blackland Prairie (formed entirely from Cretaceous Austin Chalk and Taylor Marl parent material — highly calcareous chalk and marl parent rock producing extraordinarily calcium-rich agricultural soils); the Cretaceous Eagle Ford Shale (calcareous dark shale); and the Cretaceous Woodbine Formation (calcareous sandstone). The Blackland Prairie's calcareous chalk and marl parent material releases dissolved calcium at among the highest rates of any geological terrain, producing the characteristic extremely hard Trinity River watershed supply in the DFW Metroplex.

At 314 mg/L, North Richland Hills residents face severe hard water challenges. Heavy scale deposits form rapidly on all fixtures and surfaces — monthly or more frequent descaling with commercial citric acid products is essential. Water heaters need annual professional inspection. City of North Richland Hills Water Division consistently delivers water meeting all Texas TCEQ and EPA Safe Drinking Water Act requirements.