Many houses built before 1970 have lead plumbing and also a lead supply pipe (the underground pipe which connects your home to the water main in the street). If your home was built after 1970, it is unlikely to have lead pipes.
A simple check is to look at the pipework in your kitchen. Find the pipe leading to the internal stop tap (usually under the kitchen sink). Lead pipes are dark grey (under any paint) and are soft and easily marked. If in doubt, ask a plumber to check for you.
We also have lots of helpful advice about lead pipes here.
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