I live down in Puyallup and have sent my water in to the lab to be analyzed. I can provide you with the report if you like, though I don't know how similar it is to yours up North.
This region tends toward the softer side. Chlorine can be either filtered or allowed to evaporate by pouring your water ahead of time like you said. Chloramines can be removed using campden tablets, available from the brew store.
I have heard of the water treatment changing with the seasons, but again our municipal water source is likely different. Regardless, you can send it in for analysis for about $15.
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