The short answer
Dry P-Traps
The curved pipe under sinks and drains holds water that blocks sewer gases. If the water evaporates, gases flow into your home. This often happens in rarely used bathrooms, guest sinks, or floor drains.
Run water in each drain for a few seconds to refill the traps. For floor drains, pour a cup of water down them monthly. If the smell returns quickly, there may be a leak or a crack in the trap, which a plumber can inspect.
Blocked Vent Pipes
Your plumbing system has a vent pipe that lets sewer gases escape through the roof. If that vent is blocked by leaves, a bird's nest, or debris, gases have no place to go and can back up into your home.
Check the roof vent for visible blockages. If you cannot see it safely, a roofer or a plumber can help. A blocked vent can also cause gurgling sounds in drains, so listen for that clue.
- Check for gurgling after flushing
- Look for nests or debris around roof vents
- Clear leaves from vent caps
- Note if the smell worsens in windy weather
- Call a plumber for a thorough vent inspection
Slow Drains
When a drain is slow, water sits in the pipes and can develop a sulfur-like odor. Hair, soap scum, and grease build up over time, creating a perfect spot for bacteria to grow.
Clean the drain with a mixture of baking soda and vinegar, then flush with hot water. Avoid chemical drain cleaners, as they can damage pipes. If the smell persists, the buildup may be deep in the line, and a plumber can clear it.
Sewer Gas Leaks
A cracked pipe or a loose connection in your sewer line can let gases escape into your home. This is more serious than a dry trap and can indicate a hidden leak behind walls or under floors.
If you notice a musty or rotten egg smell that comes and goes, especially after heavy rain, the leak may be in the yard or under the slab. Local water damage pros can inspect for moisture and identify the source. If water damage is involved, they can help with cleanup and repairs.
When to Call the Pros
If you have checked the obvious causes and the smell continues, it is time to bring in local water damage pros. They can use equipment to trace the odor source and check for hidden water damage, such as from a leaking pipe.
They can also handle the cleanup if sewage has backed up into your home. That work usually involves removing contaminated materials, disinfecting, and drying the area. If you live in Arlington, keep your shutoff valve location written down. Acting quickly limits damage and keeps your home safer.
- Persistent odor after basic checks
- Visible water stains or damp spots
- Sewage backup in sinks or tubs
- Musty smell that worsens in humidity
- Gurgling noises in drains
- Signs of mold or mildew
Talk to someone now
Phones are answered 24/7 for Arlington and nearby communities.
Call Now (703) 462-1739Frequently asked questions
Why does the smell come and go?
The odor can fluctuate with air pressure, wind, and temperature. When a vent is blocked or a trap is dry, gases escape only when conditions allow. Changing weather or using other drains can shift pressure and trigger the smell.
Can a sewage smell be dangerous?
Sewer gas contains methane and hydrogen sulfide, which can be harmful in high concentrations. Brief exposure may cause headaches or nausea. If you feel unwell, leave the area and see a doctor. Prolonged exposure is serious, so address the source promptly.
Will my insurance cover the cleanup?
Policies vary, and your insurer decides what is covered. Water damage from a sudden pipe burst is often covered, while gradual leaks may not be. Check your policy and document the damage with photos. A claim may be possible, but it depends on your specific coverage.
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