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Ancient groundwater: Why the water you’re drinking may be thousands of years old

Most water stored underground has been there for decades, and much of it has sat for hundreds, thousands or even millions of years. Older groundwater tends to reside deep underground, where it is less easily affected by surface conditions such as drought and pollution. People today are drilling deeper wells as droughts deplete surface water and near-surface groundwater.

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https://theconversation.com/ancient-groundwater-why-the-water-youre-drinking-may-be-thousands-of-years-old-167982

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