Why tap water tastes different when it rains a lot: "It's a good thing because it indicates that someone is treating it."

Intense rainfall events, such as those recently experienced in the eastern Iberian Peninsula, can cause a noticeable change in the taste of tap water. This alteration occurs because heavy precipitation increases the levels of mud and sediment in water sources, necessitating an intensified disinfection process by water treatment facilities.

To ensure the water remains safe and potable, authorities must apply higher concentrations of chlorine during these periods. While this process alters the flavor profile of the water, experts emphasize that the change is a positive indicator that the water is being actively treated and monitored to meet safety standards.