See the WA dui laws:, in part:
(5) Except as provided in subsection (6) of this section, a violation of this section is a gross misdemeanor.
(6) It is a class C felony punishable under chapter 9.94A RCW, or chapter 13.40 RCW if the person is a juvenile, if:
(a) The person has four or more prior offenses within ten years as defined in RCW 46.61.5055; or
(b) The person has ever previously been convicted of:
(i) Vehicular homicide while under the influence of intoxicating liquor or any drug, RCW 46.61.520(1)(a);
(ii) Vehicular assault while under the influence of intoxicating liquor or any drug, RCW 46.61.522(1)(b);
(iii) An out-of-state offense comparable to the offense specified in (b)(i) or (ii) of this subsection; or
(iv) A violation of this subsection (6) or RCW 46.61.504(6).
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