Yes, the three pools at our Calistoga, CA resort contain 100% natural geothermal water. Sitting over an underground geothermal aquifer enables us to use our wells to pump nature's gift into our pools. We vary the temperatures in our large outdoor pool between 92 to 96°F depending upon the season and maintain our outdoor jetted hot tub at 103°F, and our indoor jetted pool at 100°F.