The water fountains are turned off in the winter, and turned back on sometime around April or May I think. Once they are turned back on, the bigger dark ones are the new ones...those are likely to be working. The smaller brown ones will rarely work from my experience.

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DC Water - https://www.google.com/maps/d/viewer?mid=1cqraRSF0l3GsIW3tdYsGC2A9Ayk&usp=sharing