If you have or can get a TDS meter to check your tap water quality that may help you to decide. Vanocuver has very good quality water. At Whistler our water generally measures in at around 30tds/ppm. Which isn't too bad I suppose.
Still, if you plan on having a reef tank, it's definitely a good idea to have RO/DI water. I have been using it for the past year and really notice a difference from when I was using cleansed tap water.
HTH,
Rob
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