About T or C Hot Springs from Sierra County Recreation & Tourism:
Since before recorded history, the therapeutic benefits of the hot springs in this area have drawn people here. The hot thermal water flows out of a rift along the Rio Grande producing pristine waters with temperatures ranging from 98 to 115 degrees, with trace elements of 38 different minerals. The pH of the water is 7, or neutral. With almost 2,700 parts per million of assorted minerals, these thermal springs constitute some of the most heavily mineralized water in the United States. The continually flowing waters have no unpleasant odor; and the single largest ingredient is chloride, a naturally occurring germ killer that sterilizes the skin and ensures the purity of the water.
Mothership Hot Springs in Truth or Consequences, NM