Bartlesville Water Hardness & Quality Report (2026)

The City of Bartlesville Water Company serves approximately 34,989 residents across Bartlesville and surrounding communities including Dewey, Ramona, and Ochelata, as well as multiple rural water districts in Osage and Washington counties. The primary water source is Kaw Lake, a surface reservoir located approximately 5.5 miles east of Bartlesville, Oklahoma. The utility operates from 401 S. Johnstone Ave. and can be reached at 918-338-4282. Kaw Lake water undergoes conventional treatment addressing pH, turbidity, alkalinity, and total organic carbon before distribution to the service area.

The Kaw Lake watershed encompasses approximately 92 square miles of north-central Oklahoma terrain, fed by surface runoff. The underlying geology consists of Paleozoic-age limestone and shale formations characteristic of Oklahoma's geological setting. These carbonate-rich rock formations naturally elevate the mineral content of surface waters passing through or over them, dissolving calcium and magnesium into the supply — resulting in a hard water character consistent with the regional average of approximately 146 mg/L as CaCO₃.

Hard water in Bartlesville causes significant scale buildup in water heaters, dishwashers, and washing machines, reducing appliance efficiency and lifespan. Soap effectiveness is diminished, requiring higher dosing for cleaning. Water softening is generally recommended, particularly for high-temperature appliances. Regular descaling is a practical maintenance strategy. The utility monitors for E. coli and total coliform; a boil water order was lifted in May 2026 following successful testing. Historical notices have referenced Metribuzin pesticide residues and 1,1,2-Trichloroethane; current compliance status should be verified via the latest Consumer Confidence Report.