03-18-2013, 08:29 PM
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Springtime 'tis the season for algal blooms in surface reservoirs (caused by seasonal overturn of lake nutrients and, perhaps, aggravated by over-applied lawn products used by non-professionals?).
Water companies using surface water, at least those in the southeastern US, often add "extra" chlorine/chloramines this time of year to compensate for the additional algae load. This may, or may not be, announced. My local water system announces it over the radio (a single, solitary announcement on one day cautioning those sensitive to chlorine and those with aquaria - I'm lucky I even caught the announcement the one time I did).
Water systems may super-chlorinate at any time of the year, but typically do so after heavy rains, during algae blooms, and/or when a pipe repair has taken place.