Which method of proposing amendments are used in the state of Washington?

In Washington state, amendments to the state constitution can be proposed through two primary methods: legislative referral and initiative. The legislature can propose amendments by a two-thirds majority vote in both houses, which are then put to a public vote. Alternatively, citizens can propose amendments through an initiative process, requiring a certain number of signatures from registered voters to qualify for the ballot. Both methods ultimately require voter approval for the amendments to be enacted.