In addition to the hot spring pools, Murrieta Hot Springs Resort has a historic bathhouse with a full bath hall–style hydrothermal experience that includes access to a steam room and cold plunge ...

The water bubbling up at the surface was carbon dated to 12,000 years ago in a 2011 U.S. Geological Survey study. It originates from the nearby San Jacinto Mountains, where ice melted and seeped ...