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Is My Cloudy Tap Water Safe To Drink?

cloudy tap water

Question: The hot and cold water from our kitchen sink sometimes comes out very cloudy. If we leave the water in the container, it then clears up quickly and the cloudiness disappears. Should we be using this water, even after it turns clear?

Answer: The Massachusetts Water Resource Authority explains that cloudy water, also known as white water, is caused by air bubbles in the water. It is completely harmless.

It usually happens when it is very cold outside because the solubility of air in water increases as water pressure increases and/or water temperature decreases.

Cold water holds more air than warm water. In the winter, water travels from the reservoir which is very cold and warms up during its travel to your tap. The air that is present is no longer soluble, and comes out of solution.

In addition, once water from our reservoir enters the transmission and distribution pipes, the water is pressurized. Water under pressure holds more air than water that is not pressurized.

Once the water comes out of your tap, the water is no longer under pressure and the air comes out of solution as bubbles (similar to a carbonated soft drink). The best thing to do is let it sit in an open container until the bubbles naturally disappear.

So go drink up!

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