We have traced the water to one of three causes, all which are right next to each other: Water from the mast
, water from the tank, or condensation
... I ruled out anything from the holding tank
because it doesn't smell at all and is clear. It may be a combination of all three things but probably not the holding tank
because that sits "downhill" from where the water sits.
In an unrelated area, I did find water in a storage
section in the middle of the boat that is completely sealed by fiberglass
except for an access port at the top, and has no hosing, no penetrations at all. We cleaned that out and have not had a problem since, so I am leaning towards condensation
for that area.