Environmental regulations that permit companies to pollute U.S. reservoirs deep underground may be short-sighted, according to this analysis citing a ProPublica investigation. Some aquifers eventually may be needed for drinking water, such as the mile-deep well Mexico City plans to tap in response to its growing water shortage, according to this article. "Water is limited, so [cities and states] are really hustling to find other types of water. It's kind of a grim future; there's no two ways about it," said hydrologist Mark Williams of the University of Colorado.

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