When a garbage disposal fails to drain water, the problem is typically caused by a clogged P-trap beneath the sink, food debris packed tightly inside the disposal's lower discharge outlet, or a blockage further down the main kitchen drain line. If the disposal motor still runs, water backs up because it cannot evacuate through the plumbing waste pipe. Verification: Inspect the under-sink P-trap for clogs and use a bucket and wrench to clear out trapped debris.
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