Linda Water Hardness & Quality Report (2026)

Linda County Water District (LCWD) serves the community of Linda in San Bernardino County, California, providing drinking water to residential and commercial customers in this unincorporated area near Loma Linda. The utility relies almost entirely on groundwater pumped from multiple wells tapping the Bunker Hill subbasin of the Chino Groundwater Basin. There are no surface water imports or reservoirs directly used; treatment involves disinfection, blending if needed, and basic filtration at wellhead facilities. Details and the annual Consumer Confidence Report are available at lindawater.com.

The Bunker Hill Basin is recharged by the upper Santa Ana River system, with recharge zones in the San Bernardino Mountains and foothills. Water percolates through fractured bedrock of Mesozoic granodiorites and gneisses before depositing into Quaternary alluvial aquifers. This geology features carbonate-rich alluvium from eroded Paleozoic and Mesozoic limestones interbedded with sands and clays of the Fernando Formation. The basin's confinement and long residence times enhance mineral leaching without softening influences, producing a characteristically hard groundwater supply.

Very hard water promotes significant scale buildup in pipes, water heaters, dishwashers, and washing machines — hot water appliances suffer most due to mineral precipitation at elevated temperatures. White deposits on fixtures and reduced soap lathering are common. Regular vinegar descaling, low-flow aerators, and magnetic descalers offer maintenance relief, but a whole-house water softener is strongly recommended to prevent significant annual damages and restore appliance performance. LCWD's water meets all federal and state standards; pH typically ranges 7.5–8.2. No PFAS exceedances have been reported, with low arsenic and nitrates from agricultural runoff addressed by wellhead treatment including chloramination.