Click here to visit the Washington state website and enter your address to find out what district you live in.
Then find your legislators’ email addresses in the list below or pull them from this
spreadsheet: 2017-2018 Legislators Email
You have 1 senator and 2 representatives (position 1 and position 2).
They have universally told me that they try to respond to all personally written emails. Form emails that have the same subject line will generally get counted and added to the pile of others who sent in the same message and you will likely get an automated response. So make it personal. Personal stories are always the most effective anyway.