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The reason is our drinking water is rain water. In most parts of the country, it's ground water, and that's full of minerals that leach into the water from the soil.
"Seattle has some of the better tap water in the country."
Cities that draw their water supplies from aquifers, such as Spokane (I believe), have to treat their water for heavy metals and minerals that ground-water can contain. In those cities the water tends to taste more like mineral water and have much lower levels of chlorine.
Cities like Seattle draw their water from surface water such as the cedar river water shed. Surface water has less in the way of heavy metals, but must be treated for harmful biologicals such as algae, bacteria, and parasites. Chlorine is one of the main additives in treating drinking water for these biologicals, and since Seattle has pretty high standards for water quality they add more chlorine than some other surface water supplied cities. The levels of chlorine in the water are detectable bit far from harmful.
Fun fact: after a change in policy regarding the cleanliness of lake Washington in mid 20th century, lake Washington is now regarded the cleanest lake in an urban area in the WORLD.
But, to be honest, I live north of town, across the Snohomish line, and neither here nor at my brother's place in Maple Leaf do we taste the chlorine.
I wonder if the caps they're putting on the reservoirs around town (like at Cal Anderson) are changing the rate at which the chlorine is expelled and thus changing the taste a little for some people?
@8, yes, it is a great story. I remember hearing stories about human shit washing up on Seattle beaches. Also not mentioned in that article you link to is the god-knows-what that got discharged into the lake from the old Lake Washington Shipyard at what is now Kirkland, and numerous others, during WWII.
Shame we can't come up with a similarly effective body like Metro for the Sound, which is just about dead.
"Why does the tap water in Seattle taste like Chlorine?? [...] Is the city treating the water?" -- Why bother asking if you're going to answer your own question? Although to be fair, Seattle.gov totally dropped the ball on providing useful information about the city's drinking water.
My folks in Pierce country had great water until the neighborhood was required to put in a chlorine system. Now it's like drinking from a swimming pool.