Starting July 1st, Colorado is rolling out a new "pilot program" for allowing rainwater catchment in the state. Unfortunately, there are many limitations regarding who can set up rain barrels around their home. So, it's not a complete legalization of rainwater harvesting, but more of a first step.
Regardless, congratulations to Colorado for moving towards more sustainable and logical water laws!
Roll out the Rain Barrel for Colorado | EcoNewMexico.com