Edmond Water Hardness & Quality Report (2026)

The City of Edmond Utilities Department serves approximately 95,000 residents in Edmond, Oklahoma, primarily within Oklahoma County. Primary sources include surface water from Arcadia Lake, treated at the East Arcadia Lake Water Production Facility, and groundwater from 56 wells tapping the Garber-Wellington aquifer. A secondary source provides up to 15 million gallons per day of potable water purchased from Oklahoma City under a long-term contract, used during peak demand periods. This mixed supply ensures reliability but produces variable water characteristics across the service area.

Arcadia Lake lies in the North Canadian River watershed, with inflows influenced by Permian and Pennsylvanian rock formations including sandstones, shales, and limestones that release minerals into the water. The Garber-Wellington aquifer consists of Pennsylvanian Garber Sandstone and Wellington Formation shales, known for moderate to high mineralisation through geological dissolution of calcium and magnesium. This combination of limestone-bearing aquifer and sedimentary lake watershed creates a hard supply, with location-specific variation in chemistry due to blending ratios.

Hard water in Edmond causes lime scale on fixtures, tile grout, and inside appliances — water heaters, dishwashers, and washing machines — reducing efficiency and lifespan while increasing energy costs. Soap lathering is poor, leaving residue on skin and laundry. Regular vinegar descaling, low-flow aerators, and magnetic descalers help mitigate effects; the city recommends home water softeners for affected households. Treatment at Arcadia Lake includes pre/post-ozone, lime softening, solids contact clarification, filtration, and chloramination; third-party data notes arsenic (0.0026 PPM), uranium (0.0078 PPM), and haloacetic acids above health guidelines but within legal limits.