Discuss ways that cities can creatively improve water sustainability

Discuss ways that cities can creatively improve water sustainability. Consider social, economic, and environmental pillars of sustainability as well as barriers such as cost or political will.
What are the pros and cons of technological advancements for supplying clean water, i.e. withdrawal, storage, treatment, & transport? Consider ground & surface water extraction, reservoirs, aqueducts, desalination & reclamation in your discussion.