Floor Drain Odors: Causes and Fixes
Unpleasant smells near a floor drain are more than an annoyance—they can signal a plumbing problem that allows sewer gas to escape indoors. While some causes are simple to correct, others may require a plumber, especially if the odor returns quickly or is accompanied by slow drains or gurgling.
Below are the most common reasons floor drains develop odors and practical steps to eliminate the smell and reduce the chance it comes back.
Why floor drains smell
The leading culprit is usually a dry trap. Floor drains are connected to plumbing that includes a U-shaped or similar barrier called a trap. It holds a small amount of water that blocks sewer gas. If the water evaporates—commonly in infrequently used drains—the odor can seep through.
Another frequent cause is residue buildup. Hair, soap scum, grease, and organic debris can accumulate in or around the drain and ... Read more »
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