Edmond Water Hardness & Quality Report (2026)

Edmond, Oklahoma, a major Oklahoma City suburb in Oklahoma County, draws its municipal water supply through the City of Edmond Water Resources Division, sourcing from Arcadia Lake — a Corps of Engineers impoundment on the Deep Fork River (North Canadian River tributary) in Oklahoma and Canadian Counties — and supplemental treated water from the Oklahoma City Water Utilities Trust regional system. Arcadia Lake was developed specifically to serve Edmond and surrounding communities. Water hardness in Edmond measures 98 mg/L — classified as moderately soft.

Edmond's moderately soft supply — notably lower than Oklahoma's typical hard water profile — reflects both the Arcadia Lake watershed's water source character and the Edmond treatment process. The Deep Fork River watershed drains the central Oklahoma plains — crossing Permian Rush Springs Sandstone (calcareous but permeable sand) and Pennsylvanian Desmoinesian formations (McAlester Formation, Hartshorne Sandstone) of the Arkoma Basin transition. While the Rush Springs sandstone and Oklahoma plains contain calcareous formations, Edmond's Arcadia Lake water appears to be treated with softening processes or draw from a lower-hardness portion of the North Canadian system, resulting in finished water significantly softer than the Oklahoma City regional supply (350 mg/L) or Broken Arrow (199 mg/L).

With hardness at 98 mg/L, Edmond residents experience light to moderate scale accumulation. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware with moderate rinse-aid. City of Edmond Water Resources Division consistently delivers water meeting all Oklahoma DEQ and EPA Safe Drinking Water Act requirements.