3oaks wrote:
I would guess the smell is coming from your hot water tank caused by mineral buildup. Check and see if the smell gets stronger when you turn the hot water tap on at the sink or shower. If so, drain and flush the water heater tank to eliminate the source of the smell and check the anode rode at the same time if your tank has one.
This happened to us once. Picked up some water at a campsite that smelled bad after sitting in the hot water tank a few weeks! Drained the tank, ran fresh water through the system and the smell stopped!