Tujunga Water Hardness & Quality Report (2026)

Tujunga, California is served by the Los Angeles Department of Water and Power (LADWP), the primary municipal water utility for the region. The water supply is sourced from multiple origins, including the Los Angeles River, surface water from Big Tujunga Creek — a tributary in Los Angeles County — and groundwater from the San Fernando Basin aquifer. LADWP's regional distribution system serves Los Angeles County and surrounding areas, and the utility publishes an annual Drinking Water Quality Report in compliance with California State Water Resources Control Board regulations.

Tujunga lies within the Los Angeles River watershed, which drains the San Gabriel Mountains and surrounding terrain. The underlying geology consists of Quaternary alluvial deposits overlying Tertiary sedimentary formations, including marine and non-marine sequences of the San Fernando Basin. The San Gabriel Mountains are composed of granitic and metamorphic rocks interspersed with sedimentary layers; groundwater in the San Fernando Basin aquifer is influenced by Pliocene and Miocene-age sediments. Limestone and mineral-rich formations in this setting contribute to the hard water character typical of the greater Los Angeles area.

Tujunga's water supply is classified as hard, consistent with the broader California average of 100–300 PPM. Scale buildup in pipes, water heaters, dishwashers, and washing machines is a key concern, reducing efficiency and shortening appliance lifespans. Residents may notice reduced soap effectiveness and spotting on glassware. A water softener is recommended for households concerned about scale accumulation and appliance longevity, with point-of-use softening as a viable alternative for specific applications. Residents should consult LADWP's annual Drinking Water Quality Report and USGS Water Data for the Nation for current detailed quality data.