Chickasha Water Hardness & Quality Report (2026)

Chickasha, Oklahoma, in Grady County — the Grady County seat adjacent to Tuttle and Blanchard on the Washita River in central Oklahoma — receives its municipal water from the Chickasha Water Authority, drawing from Lake Chickasha (Grady County) on the Washita River through the Chickasha treatment plant.

The moderately soft 82 mg/L hardness and low TDS of 125.4 mg/L reflect the central Oklahoma Washita River watershed's moderate sandstone-carbonate character — notably softer than the hard eastern Oklahoma Ozark Plateau supplies (Tahlequah: 279.5 mg/L). The Washita River at Grady County drains the Anadarko Basin — Permian Rush Springs Sandstone (moderately soluble sandstone — primary aquifer with calcareous cement), Pennsylvanian Vanoss Formation (calcareous conglomerate — moderate carbonate contribution), and Permian Garber Sandstone (low carbonate). The sandstone-dominant Anadarko Basin produces the moderately soft central Oklahoma supply.

At 82 mg/L, Chickasha's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 2.6 ppt is very low — the Grady County central Oklahoma agricultural setting has limited industrial PFAS point sources, and the Washita River rural corridor produces very clean PFAS readings.