we have huge billboard here, during the hot summer months which remind folks to water later in the evening and early in the morning. I cringe when I see municipalities and home-owners with water going full blast at high noon. For one it is a gross waste due to rapid evaporation and two it causes sunburn on the plants. There is absolutely no danger of any mold or fungi from watering at night in the high desert.

The eastern slope of Colorado was/is(?) growing so much, they actually tried to build a huge "straw," I kid you not, which was to suck back water from the Colorado just west of us, just before the Utah border. The straw was to carry it back over the Rockies to Denver, etc.!

We always let our lawn, such as it is, grow out. We never water except for a soaking from a hose leading from the irrigation pipe and that is infrequent and gravity fed. The only time we mow is when the weeds try to take over, esp. the foxtail as it is dangerous to pets. The only thing we use city water for is a quick bit every morning of my perennial bed, a new small tree and butterfly bush. Fortunately, we have a few large trees which get a good soaking from the irrigation hose about once per week during the summer and/or from naturally occurring underground water.

Ebbie, I agree...there has to be enough of a demand for the innovation, but there is no good reason, imo, for them not to go ahead with making good use of so-called grey water, everywhere.