Valley Glen Water Hardness & Quality Report (2026)

Valley Glen, California, a neighborhood in the east-central San Fernando Valley of Los Angeles — a diverse residential community adjacent to North Hollywood and Van Nuys — draws its municipal water supply from the Metropolitan Water District (MWD) imported water (Colorado River Aqueduct and State Water Project) and local San Fernando Valley Groundwater Basin via the Los Angeles Department of Water and Power (LADWP) East Valley District. Water hardness in Valley Glen measures 106.5 mg/L — classified as moderately hard.

Valley Glen's moderate hardness reflects the central-east San Fernando Valley LADWP supply blend. The east San Fernando Valley (Valley Glen, Van Nuys, North Hollywood) receives the LADWP blend with a higher proportion of the Owens River Aqueduct supply compared to the west Valley. The Owens River Aqueduct originates in the Owens Valley at the foot of the eastern Sierra Nevada — draining the Pliocene–Pleistocene Bishop Tuff volcanic deposits and the Eastern Sierra Nevada Batholith (calcareous contact aureole zone). The San Fernando Valley Groundwater Basin in the Van Nuys–Valley Glen area has moderately higher mineral content than the west Valley sub-basins. The blend produces the moderate 106.5 mg/L.

At 106.5 mg/L, Valley Glen residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. LADWP consistently delivers water meeting all California SWRCB and EPA Safe Drinking Water Act requirements.