Bixby Water Hardness & Quality Report (2026)

Bixby, Oklahoma, in Tulsa County south of Tulsa in the Arkansas River bottom lands, receives its municipal water from the Tulsa Metropolitan Utility Authority (TMUA) or private utilities operating within the greater Tulsa regional water system. Tulsa's metropolitan water supply draws from Spavinaw Lake in the Cherokee Hills to the northeast — a remote Ozark Highlands reservoir considered one of Oklahoma's finest water sources — along with Oologah Lake on the Verdigris River and supplementary Skiatook Lake resources. This multi-reservoir supply system provides water to the Tulsa metro area including Bixby's growing residential communities.

The moderate 125 mg/L hardness reflects the composite character of Tulsa's regional supply system. Spavinaw Lake water is relatively soft for Oklahoma, originating in the Ozark Plateau of Cherokee County where the watershed drains Ordovician and Mississippian limestone and dolomite formations — but the large lake volume and mixing dilute the carbonate contribution significantly. Oologah Lake on the Verdigris River draws from a broader Cherokee-Craig County watershed with similar Ozark carbonate character. The blended Tulsa system supply falls in the moderate hardness range — considerably softer than central or western Oklahoma's very hard Permian-influenced water.

At 125 mg/L, Bixby's water is moderately hard — comfortable for everyday household use without mandatory treatment. Scale forms gradually in kettles and water heaters over months, soap lathers well, and glassware from the dishwasher shows light occasional spotting. Quarterly descaling is adequate for most appliances. The low PFAS level of 3.1 ppt reflects Tulsa's Ozark watershed sources, which are geographically isolated from major industrial PFAS sources. Bixby's overall water quality profile is favorable — the moderate hardness and low PFAS make it one of the less problematic water supplies in the Oklahoma municipal dataset.