ROCKVILLE, Md. (AP) — A new study says the national capital area water supply could face considerable stress by 2040.

The Interstate Commission on the Potomac River Basin recommended in a report last week that the region’s water suppliers continue to evaluate potential new water storage facilities such as reservoirs.

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The report also recommends further development of a database and model of water withdrawal and uses to provide a sound foundation for planning.

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The report says the existing water supplies serving more than 4 million residents are adequate to meet demand through 2035. But it says some reservoir resources may be exhausted by 2040.

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