From late in the article...
Early planning documents estimated that the NSA’s data center, which opened last year, would guzzle about 1.7 million gallons of water per day. That number was revised downward to 1.2 million gallons — made available at a discounted rate — according to other local documents uncovered by the Tribune. NSA did not immediately respond to a request for comment on this story.
Must be some SERIOUS big iron in use! I've done some water-cooled systems and... once the radiator is filled there's dang little additional use/input of fluid. So... if 1.2M PER DAY? Wowsers!
If this is a flow through system, ie. a river runs through it
(sorry, couldn't help myself!) then the worst the downstream side faces is slightly elevated water temperature and the water is not "used".
Looking for answers/speculation, even humor, to 1.2M per DAY water usage to cool computers. The NSA is a different topic.