Denver’s water supplier criticized Jay Z in an open letter this week for under-appreciating the value of water and recently claiming it was free.

“Your comments bring up the issue of how people value water — an issue our industry struggles with all the time,” Steve Snyder, of Denver Water, an organization the supplies some 1.3 million people and around Denver, wrote on his organization’s website. “All the money in the world can’t help when water becomes scarce.”