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New homeowners in the foothills north of Los Angeles. About 3 months ago we first noticed there was some bubbling and discoloration to the painted cinderblocks in just one corner of the basement. There has been minimal further changes since then.

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Is this a problem with a new coat of paint applied by the outgoing homeowners, or a more serious indication of leakage/water damage?

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  • Have you had heavy rains recently? If so, I'd be inclined to think it's water infiltration. See if it gets worse -- take picture periodically to compare.
    – DrMoishe Pippik
    Commented Jun 3 at 22:56
  • That's almost certainly caused by water / excessive moisture.
    – End Antisemitic Hate
    Commented Jun 4 at 7:10
  • Definitely water damage, the lower pic shows effluorescence.
    – Huesmann
    Commented Jun 4 at 11:45

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