Camarillo Water Hardness & Quality Report (2026)

The Camarillo Water District serves approximately 20,000 connections across the city of Camarillo in Ventura County, California, covering about 33 square miles including Old Town Camarillo, the Woodlands, and Las Posas Park. Water sources are mixed, drawn primarily from the Las Posas Valley Groundwater Basin aquifers and supplemented by imported supplies from the Metropolitan Water District via the State Water Project. Treatment occurs at district facilities including the Freeman WTP and Calleguas Municipal Water District plants, employing advanced disinfection and contaminant control before distribution.

The Las Posas Valley watershed spans the Oxnard Plain, fed by local recharge through alluvial fans. Underlying geology features Pleistocene and Holocene sedimentary formations, including the Pico and Repetto Formations with interbedded sandstones, shales, and limestones derived from ancient marine environments. The Las Posas Valley Groundwater Basin stores water in these porous layers, where prolonged contact with calcium carbonate-rich rocks results in a hard supply with notable mineralisation from dissolved bicarbonates.

Hard water in Camarillo causes scale buildup in pipes, heaters, and fixtures, reducing efficiency and lifespan of water heaters, dishwashers, and washing machines while increasing energy bills by up to 20–30%. Dry skin, soap scum, and spotted dishes are common household effects. Regular vinegar descaling, drain screens, and scale-resistant appliances help mitigate issues; a water softener is recommended to prevent damage and improve lathering. Recent reports note pH around 7.5–8.5 with lead/copper rule compliance; detectable arsenic, chromium-6, and trihalomethanes exceed health guidelines in some samples, prompting advanced filtration recommendations. Treatment includes chlorination, fluoridation, and blending to manage contaminants from groundwater sources.