Broken Arrow Water Hardness & Quality Report (2026)

Broken Arrow Municipal Authority serves approximately 97,808 people in Broken Arrow, Oklahoma, within Tulsa County. The primary water supply is sourced from the Verdigris River via the city's Verdigris River Water Treatment Plant, which produces about 19 million gallons per day. Additional supply, totaling around 28 million gallons per day combined, comes from the City of Tulsa. The utility performs over 6,000 water quality tests annually and consistently meets or exceeds EPA and Oklahoma Department of Environmental Quality standards.

The Verdigris River watershed spans the Ozark Plateau transition into the Cherokee Plains, where Pennsylvanian-age rocks dominate, featuring limestone and shale layers that contribute dissolved minerals. Surface water picks up hardness through limestone dissolution and evaporite traces from the subsurface Arbuckle-Wichita formations. No groundwater aquifer is utilized; the supply's hard character stems from prolonged contact with carbonate-rich geology and alluvial sediments, producing a mineralized profile typical of regional rivers influenced by karst drainage and agricultural runoff.

Very hard water in Broken Arrow causes significant scale buildup in pipes, reducing water pressure and clogging faucet aerators; water heaters suffer premature failure from mineral insulation, raising energy costs; dishwashers, washing machines, and coffee makers experience reduced efficiency and frequent repairs. Soap scum accumulates on shower doors and fixtures, demanding extra cleaning effort. A water softener is strongly recommended to extend appliance life and reduce maintenance costs. Water quality scores 80/100, with 2 contaminants above EPA health guidelines including bromodichloromethane; 66+ contaminants are tested and the utility reports no MCL violations. Treatment involves conventional processes at the Verdigris River Water Treatment Plant with fluoride added and disinfection byproducts monitored.