Bethany Water Hardness & Quality Report (2026)

Bethany, Oklahoma, in Oklahoma County — an Oklahoma County city adjacent to Oklahoma City and Warr Acres, home of Southern Nazarene University, a residential Oklahoma City inner suburb — receives its municipal water from Bethany Utilities or purchase from Oklahoma City Water Utilities, which draws from Lake Overholser and Lake Hefner on the North Canadian River in western Oklahoma County.

The extremely hard 388 mg/L hardness and very high TDS of 1044.9 mg/L reflect the North Canadian River watershed's extreme Southern Great Plains geology. The North Canadian River drains the Oklahoma Panhandle and western Oklahoma — terrain underlain by the Permian Blaine Formation (massive gypsum and anhydrite — among the largest gypsum deposits in North America), the Permian Dog Creek Shale (calcareous), the Permian Wellington Formation (salt and gypsum), and the Pennsylvanian limestone cyclothem sequence. Gypsum dissolution from the Permian evaporite outcrop belt contributes extreme calcium and sulfate, while carbonate dissolution adds bicarbonate, producing the combined extreme TDS (1045 mg/L) — among the highest in the Oklahoma City metro.

At 388 mg/L with TDS 1045 mg/L, Bethany's water is extremely hard. A whole-house water softener is essential and kitchen reverse osmosis filtration is strongly recommended — TDS of 1045 mg/L is nearly triple the EPA aesthetic guideline. The PFAS level of 6.6 ppt warrants a certified drinking water filter — the Tinker Air Force Base (Oklahoma City — a major Air Force PFAS-documented site, home of Air Force Material Command), and the Oklahoma City industrial complex contribute to Bethany's PFAS readings.