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Generally water systems (where they are supplied directly from the water mains) should not be affected by flooding, but check pipework to ensure that it has not been damaged, allowing contaminated flood water to enter the system. You will also need to check and dry any insulation on the pipes and replace as necessary.
Your local water supplier will notify you if water is to be cut off or restricted. Run taps for a period (a bowl full at least) before use to see if silt has made its way into the system.
Occasionally the mains water supply may become contaminated. If in doubt contact your water authority and boil all tap water for at least 20 minutes before use.
Wells and cisterns may be contaminated and should not be used until tested over a period of time. The requirements for this are set out in the Private Drinking Water Supplies Regulations which should be consulted (see Drinking Water Inspectorate website).
20 November 2002