How to use Washington's PhaseFinder tool to determine your COVID-19 vaccine eligibility The PhaseFinder Tool now asks about health conditions, your living situation and essential worker status to determine coronavirus vaccine eligibility. Author: KING 5 Staff Updated: 10:49 PM PST January 19, 2021 SEATTLE — Washington state has rolled out a more robust version of an online tool that determines eligibility for the COVID-19 vaccine. As of Monday, the PhaseFinder Tool asks additional questions about underlying health conditions, your living situation and whether you are an essential worker. Gov. Jay Inslee said Monday that the next vaccine phase, known as Phase 1B, would start immediately. He also announced a lower age threshold for the first tier of Phase 1B to include people 65 and older. Previously, it was people over 70. This tier will also include people over 50 years old who live in multigenerational households.