Tap water can cause all sorts of problems, depending on its chemical makeup . Blotches are the typical results. High concentrations of iron, copper and other metals can have the effect of destroying your electrolyte and I imagine that chlorine would have cause negative effects too.
Can it cause changes in the amount of time required to anodize...definately, if it will anodize at all. I can't give a much more precise response since everyones tap-water is not only different, but tap water can change chemically from day-to-day.
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