Is it an open reservoir or is ...

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Is it an open reservoir or is it covered?  They might be overdosing or it could be a seasonal effect of solar and temperature. It  is good that there is residual at the tap (I hope). More sun would decompose chlorine in an open reservoir, and lower water temperatures would slow down the chemistry. More TOC would consume more chlorine. Is it dry (less runoff) or wet weather?

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