Water disposal wells have driven fracking boom, may also cause earthquakes

The boom in oil and natural gas production in places like North Dakota, Texas, and Pennsylvania did not take off because suddenly there were waste water injection wells but because of hydraulic fracturing, directional drilling and advanced underground imaging (high oil prices also really helped).

In Oklahoma, as the article states, these waste water injection wells have been very helpful for finding a place to dispose of produced water. But it isn't accurate to say that disposal wells are "driving" the boom.