Backflow spill containment – During well testing, backflow happens when fluid flows from one zone to another due to the well pressure being higher than other zone pressures.  Backflow waters in fracking are recovered and transferred to remediation areas for cleaning.  Different types of proppants or fluids that are used in the fracking industry often contain chemicals that add stability to a proppant.  Drilling companies clean up backflow situations to keep areas like an aquifer safe from pollutants.   The EPA often inspects well sites and the surrounding aquifers for the backflow of proppant solutions that may seep into the groundwater.  Drilling companies employ spill containment techniques at well sites to aid in possible backflow situations.

Water Cycle during Fracking