Your homeowners' association may indeed be responsible for repairing the water damage inside your townhouse. But determining that requires a close read of your governing documents.
Each HOA in California is governed by covenants, conditions, and restrictions (known as CC&Rs), and they are different from one community to the next.
Regardless of what your documents say, you can begin an internal dispute resolution process, in which the HOA must try to work this out with you.
A more aggressive approach would be to enter into a pre-litigation alternative dispute resolution, in which you should be represented by a lawyer.
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