Some say down to the center of the earth. Other say that it is ok to drill and capture water that spills over to another’s land.
The Texas Supreme Court will hear arguments in Jan 2014.
From The Texas Tribune:
The Texas Supreme Court is scheduled to hear arguments on Jan. 7 in a dispute between a company that operates injection wells in Liberty County and a nearby rice farm that says wastewater from those wells has migrated into a saltwater aquifer below its land. It calls the migration trespassing, for which it should be compensated.