What is stale water

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This is because our mouths and hands are covered with these little critters, so when we touch the glass or take a sip of water, they enter that drinking water. This is equally true when we open a sealed bottle of drinking water and drink only part of the contents. This phenomenon is actually caused by carbon dioxide.

After around 12 hours, our tap water can go flat as the carbon dioxide in the air mixes with the water. This lowers the pH level of the drinking water, and this process imparts a stale, lifeless taste. We all need to drink plenty of clean and fresh water each day to stay fit and healthy. This is essential; our bodies are composed of water and dehydration is an ever present threat that we need to be aware of.

Riese, who grew up in Germany drinking unchlorinated water, disagrees here on aesthetic grounds. Dissolved gases are another part of the taste. As water sits out, small amounts of carbon dioxide dissolve into the water. This forms carbonic acid, which may lower the pH just slightly. Tiny amounts of other gases, like acetone and aldehydes, may dissolve in, too.

Leave purified water out for even 30 minutes, and it quickly becomes impure. Temperature plays another indirect role, too: Cold water generally holds more dissolved gases. But assuming you grab a new cup every few days? One possible exception: Touching the rim of your glass with dirty fingers—especially if you or whoever unloaded the dishwasher forgot to wash up after using the bathroom.

There are lots of different sickness-causing bacteria in human waste, and if you handle your glass with dirty hands, those bacteria could make their way into your water, Schwab warns. But what about that plastic water bottle on the floor of your car? Heat and plastic are a bad combination, he stresses.