Potable water spigot in Boulder?

Anybody know of a safe water spigot that I can use to fill up my van water tank?

I haven't found one in boulder unfortunately. I recently used the one in the RV park in downtown golden. I was able to just fill real quick and go but if this is going to be an ongoing thing, it's probably worth asking permission or offer a donation. 

Maybe theres an RV park closer to boulder?

Up by Ward there's a spigot fed by a spring. V. v. popular to grab water from there, so in peak times, you'll wait in line. (but it's there!) 

There's one a few steps outside the visitor center in Eldo.