Lennox Water Hardness & Quality Report (2026)

Lennox, California, in Los Angeles County directly south of LAX (Los Angeles International Airport) — a densely populated unincorporated community in the South Bay region known for its proximity to LAX's flight corridors — receives its municipal water from California American Water or through the West Basin Municipal Water District, drawing from Metropolitan Water District of Southern California (MWD) import blended with treated local West Basin recycled and basin-replenished groundwater from the LA Basin coastal aquifer system.

The moderately hard 166.5 mg/L hardness and elevated TDS of 496.7 mg/L are higher than west LA or Pacific Palisades on the same MWD grid, reflecting a heavier Colorado River Aqueduct component and West Basin groundwater blending in the coastal South Bay service zone. The West Basin Municipal Water District historically replenished the coastal LA Basin aquifer with treated imported water, but the coastal zone groundwater near Lennox and LAX has higher total dissolved solids from decades of agricultural, industrial, and urban recharge cycling. The Colorado River Aqueduct component delivers water crossing the Permian Kaibab Limestone and Triassic desert evaporite formations of the Colorado Plateau, contributing elevated calcium, magnesium, and sulfate.

At 166.5 mg/L, Lennox residents deal with moderately hard water. Scale builds in kettles and coffee machines within weeks to months, dishwashers benefit from rinse aid treatment, and bathroom fixtures develop calcium deposits. Quarterly descaling of heating appliances is the standard schedule. The PFAS level of 6.7 ppt warrants a certified drinking water filter — Lennox's position directly beneath LAX flight paths, adjacent to airport fuel handling operations, and surrounded by the South Bay industrial corridor creates one of Los Angeles County's more concentrated PFAS exposure environments for this low-income unincorporated community.