However, Mike Pocock, water resources manager at Veolia Water Central, struck a note of caution and urged customers to continue to use water wisely.

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Grameen Danone Foods, a yogurt-maker, and Grameen-Veolia, a water company, are joint ventures with French giants.

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Water firm Veolia has apologised.

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Veolia is required to sample water from the surrounding area regularly.

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Smith (water heaters), Badger Meter (water meters), Kohler (faucets and toilets), Siemens (water filtration), Veolia (sewage filtration) and Pentair (flow management and filtration).

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Veolia Equipment, which has facilities in Louisiana, has offered to make its water management resources available.

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