A strong chlorine odor will usually occur if they're main flushing in your area, be it from routine maintenance or pipe replacement and repair (main breaks). You can confirm if routine maintenance or a repair has taken place with a call to your city's engineering customer service number. Additionally they should have put local notices out before doing any main flushing maintenance work.
AFIAK none of the drinking water in the GVRD contains added Chloramines, Metro decided long ago that Chlorine treatment would be the safest option for the regional population and ecosystem. You can confirm as such though again with a call to your city's engineering customer service desk.
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