Tap water varies by location, but also significantly by season. At least in the Northeast, the all the accumulated detritus (e.g. dog feces) from the winter g

Tap water varies by location, but also significantly by season. At least in the Northeast, the all the accumulated detritus (e.g. dog feces) from the winter gets flushed into the reservoirs in the spring, and the water districts tend to spike the chlorine levels to sterilize the higher bacterial loads. Apart from that, in NYC, we have three main reservoir systems, each with their own cleanliness and taste. When one is being worked on, the water taste can change significantly.