San Jose tap water has some of the highest mineral content in Northern California. Defend your home against calcified pipe constriction, premature tankless water heater burnouts, and stained fixtures with custom high-capacity water softeners and descaling services.
San Jose residents receive water primarily through the San Jose Water Company (SJWC) , with southern neighborhoods (Blossom Valley, Santa Teresa, Almaden) served by Great Oaks Water Company , and northern corridors by San Jose Municipal Water .
Roughly half of San Jose's water is drawn directly from deep local groundwater wells in the mineral-dense Santa Clara Valley subbasin. The rest is imported surface water treated by Valley Water from the Delta. The USGS classifies any water over 10.5 GPG (180 ppm) as Very Hard —and San Jose tests between 15 and 25+ grains per gallon (250–420+ mg/L) ! Without treatment, this extreme mineral concentration bakes thick limestone scale inside your heating elements, fixtures, and appliances.
San Jose's 15–25 GPG mineral load causes rapid, measurable damage across household plumbing.
Heat exchangers scale over in just 12–18 months, causing kettling noises, combustion flame failure codes, and complete heat exchanger rupture.
White calcium deposits choke aerators and seize ceramic shower cartridges, causing drips, stiff handle operation, and ruined faucet finishes.
Minerals restrict pipe interior diameter, cutting water pressure. High dissolved solids accelerate copper pitting and slab pinhole leaks.
Cloudy film permanently etches glassware and shower doors. Dishwashers and washing machines suffer premature motor and solenoid valve failures.
Real systems installed by Daso crews on Peninsula properties.
If your San Jose tankless unit is displaying error codes, making popping noises, or dropping hot water output, our high-velocity chemical flush dissolves rock-hard calcium build-up within hours.
Custom-sized ion-exchange resin tanks calibrated specifically for your household grain capacity and peak flow demands. Uses precision metered regeneration to save up to 40% in salt usage.
Years of San Jose hard water and chloramines cause severe internal mineral clogging and pinhole slab leaks in older copper lines. We repipe homes with durable Uponor PEX-A.
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