RCW 78.60.040: Geothermal resources deemed sui generis.

Notwithstanding any other provision of law, geothermal resources are found and hereby determined to be sui generis, being neither a mineral resource nor a water resource and as such are declared to be the private property of the holder of the title to the surface land above the resource, unless the geothermal resources have been otherwise reserved by or conveyed to another person or entity. Nothing in this section divests the people of the state of any rights, title, or interest in geothermal resources owned by the state.