The true risk of the pipeline is relatively low.
The Ogallala Aquifer system, also called the High Plains Aquifer, covers approximately 174,000 square miles beneath eight different states from North Dakota to Texas, and from Nebraska to New Mexico, and portions of it are drying up pretty quick.
Pumps have been running full time since the fifties keeping the breadbasket flourishing and providing drinking water for about 80% of the people living in the vicinity. If not, it would turn back into the desert it was back in the days of the settlers.
So I can understand the concern over
possible, not probable contamination from that oil pipeline,
However, I would be much more concerned about the radioactive waste disposal site in West Texas.
IMO, The thirst for money greatly outweighs the quenching that only a good glass of drinking water can provide.