"What is part of a standard water test at a public health unit?"
Over the years I have experienced many interesting situations with water quality and testing. This example is most definitely at the top of the list and raises serious concerns about water safety. As part of routine water testing, I showed up to take a sample for bacterial analysis. After running the tap for a couple of minutes, there was a distinct chemical smell which did not diminish as the tap ran.
Before you drink your next glass of water, consider the water source and make an educated choice.