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Hydrogen sulfide, a very dangerous gas, is produced in sewers from bacterial action. That gas can travel back up through a drain that is not equipped with an effective trap. The sink's trap blocks the path with a U-shaped loop of pipe that remains filled with water.

  • The water can be siphoned out of the trap if the Plumbing is not properly vented. If you flush the toilet and you hear a slurping sound in the sink or, if you drain the sink and you hear a slurp at the end, it is time to call a plumber to inspect your pipes and and remove whatever debris might be blocking the vent stack. Birds will sometimes try building nests in them.
  • The water in the trap can dry out if the drain has not been used for a very long time. If you are going to leave a house unoccupied for months at a time, a tablespoon or two of vegetable oil down all the drains will slow evaporation. If there is a chance of the pipes freezing, a bit of automotive or RV antifreeze will not only keep the traps from drying out but it will also keep the drain pipes from bursting. Use about a half-cup in a kitchen sink, a quarter-cup in a bathroom sink or bath tub or shower and a cup in a toilet.
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10y ago
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14y ago

Exactly that, rotten food. Purchase some drain cleaner and follow directions. Food leaves some bacteria in the pipes of kitchen sinks. Of course it shouldnt, reality is that it does. 3 or 4 times per year I use drain cleaner and the smell goes away.

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Q: What would cause rotten food smell in kitchen drains?
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