When a toilet water tank is leaking from the very bottom, it typically indicates a failure of the internal rubber tank-to-bowl gasket, degraded rubber washers on the mounting bolts, or a loose large center flush valve locking nut. Over years of exposure to water and mineral treatment chemicals, these rubber components lose elasticity and crack, allowing water to seep through the bolt holes or central opening. Callout type="warning" title="Hygiene Warning": Shut off the water supply valve and drain the tank completely before replacing rubber gaskets. Verification: Dry the underside of the tank and observe where droplets form during a refill cycle to confirm the exact source.
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