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Rio+20 challenge: access to water in Mexico City

Lives revolve around finding water in parts of Mexico City, where 33 percent of residents don't have daily access to it.

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Light starts to filter through the one-room home Margarita Garcia Velazquez shares with her husband and four children on the fringes of Mexico City, but she cannot turn on a faucet to brush teeth or wash little faces.

In fact, every move she makes with the children, ages 2 to 12 – from cleaning the breakfast dishes to scrubbing the dirt out of school uniforms – requires that she first walk down two dozen steps to the road in front of her house. There await four large barrels of water that hold her entire week's supply of water. Ms. Garcia Velazquez fills her two buckets and then carries them back up again.

Getting water to its 20 million residents is one of Mexico City's most vexing problems. At an altitude of more than 7,300 feet, the city takes water from aquifers that aren't naturally replenished, so it must pump the rest up 3,000 feet to reach residents. Because of sprawl, some 5 percent of Mexico City is not connected to the water supply, says David Vargas, the chief operating officer of Isla Urbana, a nonprofit group that works with residents of Tecalipa, where Garcia Velazquez lives, to build rainwater catchment systems.

Because demand outweighs supply, another 33 percent of Mexico City residents don't have daily access to water.

"It's not like in the US, where you turn on a faucet and there is water, always," Mr. Vargas says.

Latin America is the most urbanized region in the world, and like so many communities in the region, Tecalipa is an illegal settlement and disconnected from the water system. As in other megacities, the politics of water here are fraught. Mexico City must play a balancing act when it comes to illegal settlements like this one, Vargas says – especially since the city doesn't want to send a message that it supports illegal encampments. So for now, Mexico City's initiatives are largely limited to delivering truckloads of water every week to communities like Tecalipa.

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