My first suggestion would be to incorperate as an "S" corp,and add your spouse to the license so that if something should happen to you, God forbid, the business could continue after your passing, not to mention the tax benefits associated with incorporation as an "S". Here in NC you must file a request to be an "S" corp with your incorporation papers or you automatically become a "C" corp which can be disasterous in it's tax implication (i.e. - double taxation). I think that if your marriage is strong, and it doesn't cost considerably more to do so, it would seem to be prudent to add your spouse.
I would consult with a CPA and/or a (and I hate to say this as I am not particularly found of them) lawyer.

I don't know about WA state, but where I am from, whomever has their name on the license, opens themselves up to the possiblity of being sued, should something go awry. Also, should any laws or ordinances be broken it is the person(s) who has their name on the license who gets the fine and/or appear in court and possibly face jailtime.

You may want to leave a spouse's name off a license if they do not actively participate in the business (or even if they do).

Something to consider.

Best to consult a lawyer for your area.