As far as the city's water use is concerned, Denver Water estimates lawn irrigation accounts for 50 percent of single-family homes' total use. Single-family homes use 47 percent of all the city's water sales, according to a 2011 study. If that's still true today, lawn watering uses nearly a quarter of every drop Denver Water sells to the city.
And that's potable water, too. I mean, what are we even doing?
It's good for cities to do their part, but AFAIK, we need to focus on agriculture - what crops are raised for what, the techniques they use, what we are putting on our plates, etc, since in Colorado that is 90% of the usage, while municipal use is 7%. Yes, it's rather stupid to use 25% of that municipal water and spray it on a non-native plant for decorative purposes, but we are going to have to rethink what we eat and how we make that food...