Why does cold water from one bathroom tap smell for four seconds but the other tap does not?
Our answer
Catch the first cold draw and the water after flushing in separate clean glasses. Smell them away from the sink to distinguish water odour from a drain smell. If only the first glass from one outlet smells, ask a plumber to check the aerator and local branch. For sewage, chemical or unexplained persistent odours, use a known safe supply and contact your water provider.