Legionnaires disease can be prevented by proper chlorination (treatment of water with chlorine) and sealing of water supplies.

军团病是可以预防的，由适当的加氯和密封水的供应。

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Germany: The government has offered a wide range of assistance, including evacuation by air, medical services, transportation services, water treatment capabilities, assistance in searching for victims, vaccination teams and supplies, and emergency shelter.

CNN: Offers of aid from around the world

Water supplies in north Gloucestershire were running out on Sunday evening after a treatment plant flooded.

BBC: NEWS | UK | Water runs out in flood-hit areas

This should not cause problems for public water companies, which already have monitoring and treatment processes to deal with any organisms or chemicals in their supplies.

BBC: Pyre health risk warning