A surprise discovery of an untapped water basin, more than two kilometers beneath Mexico City, will be enough to provide an excellent source of groundwater to the city for at least a century, according to official reports. No official time-line for tapping the water source was given, but all projections are optimistic about the find.

Mexico City discovered a water basin more than a mile underground that’s large enough to supply the nation’s capital with tap water for a century, Reforma reported, citing a city official.

An exploratory well led to the discovery on the eastern side of the city, the newspaper reported, citing Ramon Aguirre, head of the local water system. The water basin is located 2,000 meters (6,560 feet) deep and may produce 80,000 liters (21,100 gallons) per second, Reforma said without giving a timelime for the site’s development.

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