Orange Water Hardness & Quality Report (2026)

The City of Orange Water Division serves Orange, California, in Orange County. The utility operates three primary water sources: groundwater from 12 municipal wells drilled approximately 1,000 feet into the Santa Ana River Aquifer, purchased surface water imported from the Colorado River via the Metropolitan Water District, and water from Northern California's State Water Project. All sources are disinfected with chlorine and meet state and federal regulations. The utility has provided annual Consumer Confidence Reports since 1990, documenting compliance with Safe Drinking Water Act standards throughout its service area.

The Santa Ana River Aquifer is a Quaternary alluvial aquifer system whose sedimentary deposits naturally contain dissolved calcium and magnesium from limestone and gypsum formations. Imported Colorado River and Northern California State Water Project water is typically hard, while local groundwater is moderately hard. The seasonal blending of these sources creates variable hardness levels depending on source allocation and water availability, with imported hard water comprising a larger proportion during winter months, contributing to an overall hard supply character.

At very hard water levels (10.5+ GPG or 180+ mg/L), Orange residents experience significant scale buildup on glassware and fixtures, reduced water heater and dishwasher efficiency, and shortened appliance lifespans. White spots on glassware are particularly noticeable in winter when imported hard water dominates supply. Soap and shampoo lather poorly, and skin and hair dryness are common complaints. Water softener installation is strongly recommended; the City of Orange advises consulting dishwasher manufacturer guidelines for hard-water settings. Full pH, PFAS, and detailed contaminant data are published annually in the utility's Consumer Confidence Report via the California State Water Resources Control Board electronic archive.