A cold toilet tank can collect condensation when the bathroom air is humid. That moisture can run down the outside and pool near the base. A leaking supply connection or seal can leave water in the same place, so locate where the moisture first appears.
Dry the outside and watch during normal use
Wipe the tank, supply connection and floor dry. If beads form across the tank after a shower or flush, condensation may be contributing. If a single connection wets first or water appears at the base immediately after flushing, report that pattern. Stop using the toilet if you suspect wastewater is escaping.
Tell the plumber when the floor gets wet
Note whether the toilet rocks, whether water appears while it sits idle, and whether the ceiling below shows staining. These details help the plumber decide whether to inspect the supply, the tank connections or the seal at the floor.
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