There are many ways to support the PCT in Washington and hikers who enjoy it. This could be anything from sharing trail reports and updating the FarOut app with water locations to volunteering to repair the trail itself. Everyone on the trail can support it by practicing leave-no-trace (LNT) virtues.

Trail Maintenance

There are three regional groups in Washington.
You can volunteer for any of them using the PCTA Connect site.

PCTA North 350 Blades

Supports 350 miles of trail from Chinook Pass to the Northern Terminus.
Facebook: North 350 Blades
Email at PCTA

PCTA White Pass Chapter

Supports 70 miles of trail from Midway to Chinook Pass.
Facebook: White pass Chapter
Email at PCTA

PCTA Mount Hood Chapter

Supports 214 miles of trail from Bridge of the Gods to Midway (and parts of Oregon).
Facebook: Mount Hood Chapter
Email at PCTA

Washington Trails Association

Not directly associated with the PCTA, the WTA is a state-wide organization that supports public use of trails and public lands in many ways including coordinating volunteer trail maintenance that sometimes includes the PCT. Their website allows sharing trip reports that are extremely valuable for planning hikes.
WTA Volunteer

Lodging

The Lion's Den, Mazama, WA

Almost every thru hiker and many section hikers stop at the Lion's Den before or after hiking to the Canadian border. Mary LaVerne Garber-Williams committed to this labor of love Thanksgiving day 2021 when she purchased the long-time hiker hostel Ravensong's Roost from Carolyn Ravensong Burkhart. (the first woman to solo hike the PCT in 1976, while Mary became the first female medic in Nevada that same year).

Facebook: The Lion's Den

Lions Den is run on donations.

Ways you can donate

Zelle: 702-281-9949
Venmo: @Mary-Garber-Williams with confirming ph. 702-281-9949
PayPal: @peacelovedove
Amazon: wish list

To Volunteer your time and skills, you can direct message Mary from the Facebook page above.

Guye Cabin, The Washington Alpine Club, Snoqualmie Pass, WA

Guye Cabin is a short walk from the north PCT Trailhead at Snoqualmie Pass. The WAC, a non-profit, offers discounted lodging, meals, showers, and wifi (about half the price of the Summit Inn)

Ways you can donate

To support Guye Cabin you can donate via the website, you can become a member, and you can volunteer your time. Website: Washington Alpine Club

Trail Magic

Delivering "trail magic" as a "trail angel" covers a wide variety of hiker support activities including rides to/from trailheads, feeding hikers, delivering needed supplies, and more.
The PCT Washington Trail Angels page on Facebook is where you can match your ability to help with the current needs of hikers.