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Hello, I am a solicitor with 20 years experience. I will try to answer this for you.
The answer to this will depend on whether any misleading information was given by the vendor and whether the leak was covered in the questions asked by your solicitor. That would be disclosed through standard enquiries by your solicitor before purchase. You should check with your solicitor whether those enquiries were carried out. It may be that in the report on property that would ave been prepared by your soliciitor that this is made clear.
If the information was hidden you may have an action against the vendor. If the question wasn't asked you may have an action against the solicitor.