That's because as temperatures rise, heat and sunlight break down chlorine compounds from municipal water treatment. Extra chlorine is needed to effectively disinfect water from algae and bacteria. That results in the chlorine taste. The steam then passes through a coiled line into another chamber where it is condensed back into water. The bottom line is summer heat is more than just an uncomfortable inconvenience.
Dehydration is a real health risk, but consumers can protect themselves by drinking plenty of water.