RCW 4.24.040: Action for negligently permitting fire to spread.

Except as provided in RCW 76.04.760, if any person shall for any lawful purpose kindle a fire upon his or her own land, he or she shall do it at such time and in such manner, and shall take such care of it to prevent it from spreading and doing damage to other persons' property, as a prudent and careful person would do, and if he or she fails so to do he or she shall be liable in an action on the case to any person suffering damage thereby to the full amount of such damage.