In all of the above scenarios, you may have the ability to file your claim in multiple states. Generally, you will have the option of filing in:
1) the state in which you were injured;
2) the state in which you primarily worked; and
3) the state in which you entered into your employment contract.
If you are injured outside Washington, or whatever state in which you normally work, it is important to evaluate your options and file wherever you might have a legitimate claim. It is possible that you have remedies available to you in more than one state.