Malibu Water Hardness & Quality Report (2026)

Malibu, California, in Los Angeles County — a Los Angeles County coastal city adjacent to Pacific Palisades and Thousand Oaks on the west Los Angeles coast — receives its water from the Malibu Water District, drawing from the Metropolitan Water District or local Malibu Creek watershed (Los Angeles County) through the west Los Angeles coast distribution.

The moderately soft 90 mg/L hardness and TDS of 218.6 mg/L reflect the west Los Angeles coast County MWD blended supply's moderate character — identical to Commerce CA (90 mg/L/218), consistent with the MWD blended supply across the Los Angeles metro area where the SWP Sierra Nevada soft component and Colorado River harder component blend to ~90 mg/L typical for the MWD service area. The MWD-Malibu blend at Los Angeles County — Jurassic Sierra Nevada (insoluble — SWP dilutant), Permian Colorado Plateau calcareous (calcareous — Colorado River component), and local Cretaceous Santa Monica Mountains (insoluble — minor local well component).

At 90 mg/L, Malibu's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 4.5 ppt warrants a certified drinking water filter — the Los Angeles County west coast industrial corridor contribute to Malibu's readings.