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(Bloomberg) -- Nestle SA is moving to bolster the sustainability credentials of its bottled water business amid criticism that packaging the precious resource and transporting it across the world causes unnecessary environmental damage.

The maker of Perrier and Pure Life is strengthening its ties with Alliance for Water Stewardship, which will monitor whether 20 sites meet its standards on water use by 2020, the Vevey, Switzerland-based company said in a statement Wednesday. Nestle already has four plants certified by the group in Pakistan and California.

The announcement comes a month after competitor Danone said it aims to make Evian the first major carbon-neutral springwater brand. Nestle has reduced its additional water consumption to make a liter of bottled water by 20 percent since 2011. One of the company’s plants in Mexico is entirely water-self-sufficient, meeting all its needs with liquid that’s left over when milk is dried into Nido brand powder.

The AWS certification process includes a commitment to improving water usage and gathering data on water collection. Nestle’s water-saving approach will vary among factories, but in rural areas it may work with farmers in the surrounding areas to help them optimize irrigation practices and avoid the use of pesticides.

To contact the reporters on this story: Corinne Gretler in Zurich at cgretler1@bloomberg.net, Robert Williams in Paris at rwilliams323@bloomberg.net.

To contact the editors responsible for this story: Eric Pfanner at epfanner1@bloomberg.net, Thomas Mulier

©2017 Bloomberg L.P.

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