"Oklahoma restricts oil field wastewater injection within a half-mile of public water wells to protect against pollution." Regulators have let companies do it anyway for at least 114 wells.

"Down a dirt road in northwest Oklahoma, only a few hundred yards from where the city of Enid draws its drinking water, a company injects the toxic byproduct of oil production deep underground.

That close proximity violates a state rule meant to protect public groundwater supplies from oil field wastewater, which can be saltier than the sea and laden with toxic metals. Injection operations are banned within a half-mile of public water wells unless regulators hold a hearing to ensure that such activity will not pollute the water. 

But in 2018, without a hearing, state regulators approved this injection well, an apparatus that applies pressure to dispose of wastewater down a steel tube. And in the years since, the well, named the Flying Monkey, has repeatedly failed structural integrity tests, signaling a potential leak."

Nick Bowlin and Al Shaw report for ProPublica, co-published with The Frontier June 30, 2026. [2]