"Whiskey's for drinking; water's for fighting."

Los Angeles lives on the water it imports from Northern California and the Colorado River. California is expected to add millions of new residents over the next couple decades, many of which are likely to reside somewhere in Southern California. Constrained resources and rising demand make our reliance on imported water unsustainable. Also, transporting water is incredibly energy intensive. According to some estimates, 20% of California's carbon dioxide emissions result from pumping water throughout the state.

Some people are already thinking about to how reconcile the demand for growth and development with the environmental, economic and social imperative to build sustainably. A recent article by Metropolis Magazine discusses the nexus between water and sustainability. The article culminates in a call to action for those interested in designing a sustainable vision for our cities:

"The Living City Design Competition calls on the world’s most ambitious designers to create an inspiring but realistic vision for the future of civilization. Competition teams will conceptually retrofit existing cities, demonstrating how real communities might transform their relationship with the resources that sustain them. These re-imagined cities must achieve each Imperative of the Living Building Challenge, the built environment’s most rigorous performance standard.

To be certified under the Living Building Challenge, a project must capture and treat all of its own water onsite using ecologically sound processes. It must also ensure that 100% of storm water and building discharge feeds the project’s internal water demands or is released onto adjacent sites for management through gradual surface flow, groundwater recharge, agricultural use or adjacent building needs."

Los Angeles River

The challenge to have no net import and no net export of water within a given site is the ultimate metric for water sustainability and ought to be the goal for all buildings in the Los Angeles region. There is no reason why resources and money should be spent to send rainwater out to sea when it could be harnessed for more productive uses, thereby eliminating the need for the costly and damaging practice of importing water.