Stop Pouring Pasta Water Down the Drain

When you cook pasta, it’s almost second nature to tip the hot water straight into the sink. That very habit can, over time, damage pipes, the sink and seals - and it also throws away a liquid that professional chefs have long treated like liquid gold. It’s worth taking a hard look at this everyday automatic reflex.

Hot danger in the drain: how pasta water puts your pipes under strain

As pasta cooks, the water quickly reaches temperatures close to boiling. If that liquid goes directly down the drain, it hits the pipework almost immediately and without any cooling. In many homes, those pipes are made from PVC - a plastic that is far more sensitive to heat than many people realise.

Why near-boiling water is a problem for PVC pipework

From around 60 to 70 °C, PVC can begin to soften. Pasta water is often close to 100 °C. That leaves little margin for error and creates a high load. If it happens only now and then, pipes usually cope. But if you cook several times a week and pour boiling water into the sink each time, you subject the pipework to repeated heat stress.

"The real damage doesn’t happen dramatically - it creeps in over months and years."

What can happen over time

Possible consequences include:

• slight warping around pipe bends

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