What’s the risk of boiling tap water that’s already hot?

Verified on 12/10/2022 by PasseportSanté
Que risquez-vous à faire bouillir de l'eau du robinet déjà chaude ?

When cooking pasta, rice and other foods in a saucepan, we tend to use hot tap water to bring it to the boil more quickly.

However, it’s best to avoid using hot water from the tap and instead boil cold water. We explain why!

Why shouldn’t I boil tap water that’s already hot?

The hot water coming from the tap comes from the water heater, where it has usually been for several hours.

Not only does the cumulus encourage the proliferation of bacteria, but many homes still have old or substandard pipes. For example, an estimated 2 to 3 million homes have lead pipes.

In short, the reason to avoid boiling hot tap water is that it encourages metal migration. It is said that there is twice as much lead in water at 25°C as in water at 15°C.

How can we improve water quality?

As you can see, to avoid metal migration in your culinary preparations, it’s best to use cold water, whether you’re heating food or preparing hot drinks.

While using cold water prevents metals from migrating into your preparations, it does not prevent the water from being contaminated by certain pollutants such as pesticides.

To reduce the presence of harmful and polluting substances in your tap water, the best thing to do is invest in a domestic osmosis unit, a tap water filtration system that filters out chlorine, metals and organic matter…