West Hills Water Hardness & Quality Report (2026)

West Hills, California, a neighborhood of Los Angeles in the western San Fernando Valley — a major upscale west San Fernando Valley residential neighborhood, formerly known as Canoga Park until 1987 (when the western portion was renamed West Hills to distinguish the wealthier foothill area), adjacent to the Santa Susana Mountains and Box Canyon, home of the former Rocketdyne Santa Susana Field Laboratory (a Cold War nuclear and rocket testing site now undergoing environmental remediation), and a diverse Los Angeles San Fernando Valley community — draws its municipal water supply from the MWD blend via the LADWP. Water hardness in West Hills measures 88.5 mg/L — classified as moderately soft.

West Hills' moderate softness — significantly softer than most San Fernando Valley communities — reflects the LADWP's effective treatment in the northwest San Fernando Valley West Hills distribution zone. The MWD blend (Colorado River at approximately 280–320 mg/L and State Water Project at approximately 85–120 mg/L) is treated at LADWP treatment facilities. The West Hills distribution zone (predominantly post-1960s upscale west San Fernando Valley residential development) has relatively newer infrastructure compared to central valley neighborhoods, contributing to the softer 88.5 mg/L.

With hardness at 88.5 mg/L, West Hills residents enjoy moderately soft water for the San Fernando Valley. LADWP consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.