Wastewater injection wells, contrary to popular press, are not used primarily for the disposal of fracking fluid or other drilling waste products. Produced wate

Wastewater injection wells, contrary to popular press, are not used primarily for the disposal of fracking fluid or other drilling waste products. Produced water is, by far, the largest component going into wastewater injection wells. When you get oil and gas out of the ground, a lot of salt water comes with it. Sometimes, especially in Oklahoma, there can be 10 times as much water as oil. This "produced water" is used for injection into other wells to displace oil, but there's enough left over to require wastewater injection wells for its disposal. http://energyindepth.org/wp-content/uploads/2015/02/Wastewater-Disposal-Q-and-A1.pdf http://energyindepth.org/wp-content/uploads/2015/02/Wastewat...