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Why Does My House Smell Like Sewer? A Des Moines Homeowner's Guide
If you've walked into a bathroom, basement, laundry room, or kitchen and noticed a sewer smell in house, it is worth paying attention to.
The source may be something simple, such as an unused drain. It can also point to a blockage, plumbing vent problem, sewer line issue, or developing sewer backup.
Finding the cause early can help prevent bigger plumbing problems later. A recurring sewer gas smell means something in the plumbing system needs attention.
Unused Drains and Sewer Odors
Every drain in the house has a trap designed to hold water.
That water creates a barrier between the home and the sewer system. When the trap dries out, sewer gases can move through the drain and into the room.
This is common in:
- Guest bathrooms
- Basement floor drains
- Laundry room drains
- Utility sinks
- Rarely used bathrooms
The problem can show up in Iowa basements that sit largely unused between winter and summer seasons.
Running water into the drain may refill the trap and stop the smell. If the odor returns after a short time, there is a larger plumbing issue that needs investigation.
Drain Blockages and Odor Problems
Not every sewer smell starts in the sewer line.
Grease, soap residue, food waste, hair, and sediment buildup can collect inside drainpipes over time. As that material accumulates, it can create unpleasant smells that spread into nearby rooms.
Warning signs include:
- Slow drains
- Gurgling sounds
- Standing water
- Recurring odors
A drain that continues to smell after being flushed with water may need professional drain cleaning.
Professional drain clearing removes the buildup causing the problem instead of temporarily covering it up.
Sewer Line and Plumbing Vent Problems
A sewer odor throughout multiple rooms points to a larger issue.
Plumbing vents are designed to move sewer gases safely outside the home. If a vent becomes blocked by debris, leaves, or other obstructions, those gases can remain trapped inside the plumbing system.
Sewer line restrictions can create similar symptoms.
Watch for signs such as:
- Multiple slow drains
- Bubbling toilets
- Sewage odors
- Water backing up in other fixtures
These warning signs deserve attention before a sewer backup develops.
Professional sewer cleaning services can help remove restrictions inside the line before they create a larger problem.
If damage is found during an inspection, sewer line repair may be needed to correct the issue.
When Sewer Smells Are an Emergency
A mild odor from an unused drain is very different from sewage entering the home.
Call for service right away if you notice:
- Strong sewer odors throughout the house
- Sewage backing up into tubs, showers, or sinks
- Standing wastewater
- Multiple affected drains
- Water coming up through floor drains
Avoid using the affected plumbing fixtures until the source of the problem is identified.
Waiting allows the situation to worsen and increase cleanup costs.
How Professional Drain and Sewer Service Helps
Finding the cause of a sewer smell is not always straightforward.
The odor can come from a drain trap, blocked vent, damaged pipe, or the sewer line itself. Smells can travel through walls and hidden plumbing spaces, making the problem difficult to trace.
A professional inspection helps identify what is causing the odor and what is needed to correct it.
Solutions may include:
- Drain cleaning
- Drain clearing
- Sewer cleaning
- Hydro jetting
- Pipe repairs
- Sewer line repairs
Addressing the cause is far more effective than using air fresheners or odor-control products that only mask the problem.
Bell Brothers also backs our plumbing work with transparent pricing!
Local Drain and Sewer Help in Des Moines and Central Iowa
Bell Brothers has served Central Iowa since 1955.
We provide drain and sewer services throughout Des Moines, West Des Moines, Ankeny, Urbandale, Johnston, Waukee, Altoona, and surrounding communities.
From homes near the Grand Building downtown to neighborhoods around Principal Park, Bell Brothers helps identify and correct drain and sewer problems throughout the metro area.
Regular plumbing inspections can help identify problems before they turn into backups or emergency repairs.
Our Comfy Club helps keep routine maintenance on schedule throughout the year.
Financing options are available for qualifying plumbing projects.
Schedule online if sewer odors keep returning or if you suspect a problem with the drains or sewer system.
Schedule OnlineFrequently Asked Questions
Odors often become easier to notice at night when windows are closed and airflow changes throughout the home. A dry drain trap, vent problem, or sewer issue may be responsible.
Yes. When the water inside the drain trap evaporates, sewer gases can enter the home through the drain opening.
A sewer gas smell should always be investigated. Even when the cause is minor, the odor indicates sewer gases are entering the home instead of staying inside the plumbing system.
A dry drain trap, clogged drain, vent issue, damaged seal, or sewer problem can all create odors in a bathroom.
Call when the smell keeps returning, multiple drains are affected, water begins backing up, or the source of the odor cannot be identified.
