In Washington State - a DUI or Physical Control conviction is a Class C felony punishable under RCW 9.94A - if you have:
(a) four (4) prior DUI or Physical Control convictions within ten years, or
(b) one (1) prior conviction of Vehicular Homicide or Vehicular Assault, or
(c) a prior Class C felony resulting from (a) or (b).
"Within ten years means that the arrest for the prior offense occurred within ten years before or after the arrest for the current offense." RCW 46.61.5055(14)(c).