Great question. Presently, Washington automatically registers anyone who gets as state ID or driver's license. We also allow preregistration for 16- and 17-year olds.https://thehill.com/homenews/state-watch/379282-wa-gov-signs-universal-voter-registration-law …
It's tricky to register folks without their consent i.e. when they haven't volunteered their information. But! You don't need an ID to register to vote in Washington, so long as you do it by mail or online. @kcelections can answer any other questions!