There is no universally accepted definition of a hot spring. For example, one can find the words "hot springs" defined as:
* any geothermal spring
* a spring with water temperatures above its surroundings
* a natural spring with water temperature above body temperature – normally between 36.5 °C (97.7 °F) and 37.5 °C (99.5 °F)
* a natural spring with warm water above body temperature
* a thermal spring with water warmer than 36.7 °C (98.1 °F)
* a natural spring of water greater than 21.1 °C (70.0 °F) (synonymous with thermal spring)
* a natural discharge of groundwater with elevated temperatures
* a type of thermal spring in which hot water is brought to the surface. The water temperature of a hot spring is usually 6.5 °C (11.7 °F) or more above mean air temperature. Note that by this definition, "thermal spring" is not synonymous with the term "hot spring".
* a spring whose hot water is brought to the surface (synonymous with a thermal spring). The water temperature of the spring is usually 8.3 °C (14.9 °F) or more above the mean air temperature.
* a spring with water above the core human body temperature – 36.7 °C (98.1 °F).
* a spring with water above average ambient ground temperature, a definition favored by some.
* a spring with water temperatures above 50 °C (122 °F)
(The above definitions of hot springs were copied from wikipedia.)
If you find a spring that you believe meets at least one of the criteria above, this is the place to waymark it!