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"During fluid injection, the pore pressure increases at the injection well and diffuses away from the well because of fluid migration. This is analogous to how temperature 'diffuses away' from hot areas to cold areas," Juanes explained.

There’s at least one example of a geothermal company operating near the Salton Sea allowing an injection well site to become over pressurized to the point that fluids broke through the crust and made it back to the surface.

But they’re still some distance away from injection well sites on geothermal company land.

On Sunday, Ms Shore announced the EPA planned to begin shipping liquid waste to an underground injection well, while solid waste would go to an incinerator.

She said liquid waste is destined for a site about 130 miles west in Vickery, Ohio, where it will be disposed of in an underground injection well.