Yep... particularly Legionella Pneumophila and friends which can cause Legionnaire's disease. I was taught as a child NEVER to use a hot shower from a water ta

Yep... particularly Legionella Pneumophila and friends which can cause Legionnaire's disease. I was taught as a child NEVER to use a hot shower from a water tank or drink warm water from the tap after a sustained power outage until the tank has had time to come back up to it's normal temperature... Legionnaire's can straight-up kill you via pneumonia.