As the combined effects of a historic drought, increasing population and a changing climatecontinue to roil the Southwest and its water supply, metro Phoenix cities look for ways to make every drop count.

Peoria recently approved a $2.2 million project to recover its wastewater — everything that goes down your drain — and inject it on a more mass scale into the ground, where the city pulls its drinking water.

Wastewater for decades has been an important renewable resource for Arizona cities, especially those in the West Valley that don't receive as much Colorado River water as Phoenix and its neighbors to the east.