Washington state has complete preemption of firearms laws, meaning local governments can't make laws stricter than the state's.
If you follow WA state law, you will be fine. Even if you are charged with violating a local section, you can fight it in court and win.
It seems our legal gurus here have not tackled this law yet, or maybe they have by now. That's an illegal law as I read it.
It's something to contact your city council about, and press the issue. Oak Harbor is a recent case you could bring up to back your opinion.