If persistent plunging and a toilet auger (snake) fail to clear a stubborn blockage, the obstruction may be lodged deep within the main sewer line or vent stack, or caused by a foreign object stuck in the trapway. Stop using chemical drain cleaners, as they can sit in the bowl and splash dangerously. At this stage, you should shut off the water supply valve behind the toilet and contact a licensed professional plumber equipped with professional camera inspection tools and commercial drain snakes. Verification: Inspect nearby bathroom drains (like the shower or sink) to check if the backup is isolated to the toilet or affects the entire home drainage system.
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