We have had an ongoing problem with rainwater coming in our chimney and out the cleanout. I'm not talking a little bit of water.... One night we filled a ten gallon shop vac! It only happens when we get heavy rain combined with heavy wind, which leads me to believe that it's not groundwater, or else we would see it coming in regardless of the wind. We have had our chimney cap upgraded, and our flashing around the chimney fixed up and upgraded... Still seeing water. What else could it be?!
Getting a little desperate as there seems to be no stopping it and it's ruining my basement!