The water at the campground is not potable, the visitors center is open year time and the water is running all year. I've been there in the middle of the winter and there was still heat and water in the drop in visitor area.
There is potable water at the ranger station. Not sure if it's seasonally closed or maintained. Out in that country, I'd always bring and rely on water you bring.
There is however potable water at the rangers station where the guestbook and maps are. Its a mile or two from the campground so it shouldn't be trouble to keep hydrated.
Well not running water, but springs and a stream. Not sure if water is safe
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