Ann Kirkpatrick actually said...

There is a note that there was a sprinkler system interruption due to a water line break in November of 2012.

Analyzing VA's Actions To Prevent Legionnaires' Disease In Pittsburgh.

Because they have already paid the price, we must fight for our veterans with all our might.

I appreciate your answer, but I do not think you completely answered my question which is, why not use an alternate water source?