The short answer
Find the Moisture Source
A cellar smell almost always traces back to water. Check for damp spots on walls, floors, or around pipes. Look for white or dark stains on concrete, which can signal seepage. Also inspect window wells, gutters, and downspouts to see if water is pooling near the foundation.
Sometimes the cause is hidden, like a slow pipe leak inside a wall or under a slab. You can listen for dripping or use a moisture meter if you have one. If you cannot find the source, local water damage pros can help with leak detection services to pinpoint the problem.
Reduce Humidity and Improve Airflow
High humidity makes the smell worse. Use a dehumidifier in the basement, especially during wet months. Keep the area ventilated by opening windows when weather allows or using fans to move air. This helps dry out surfaces and discourages mold growth.
Check for standing water in crawl spaces or under shelves. Remove any wet cardboard, wood, or fabric, as these hold moisture and intensify the odor. If the air feels sticky even after dehumidifying, the issue may be deeper, such as groundwater pressure against the foundation.
- Run a dehumidifier and empty it regularly
- Open basement windows on dry days
- Move stored items away from walls
- Wipe down damp surfaces with a dry cloth
- Use a fan to circulate air in corners
- Check for condensation on pipes and insulate them
Clean and Remove Musty Smells
Once the area is dry, clean surfaces with a mild detergent or a mixture of water and white vinegar. Scrub concrete floors and walls to remove any mildew. Avoid using bleach on porous surfaces, as it may not reach the roots of mold.
For porous items like drywall or insulation that smell strongly, replacement is often the only fix. If you notice black or green patches, that is mold, and you should contact a mold professional for safe removal. Do not disturb mold without protection.
Consider Structural Drying
If the smell persists after cleaning, the materials themselves may be saturated. Structural drying and dehumidification can help dry out walls, floors, and framing. This process uses specialized equipment to pull moisture from deep within building materials.
Local water damage pros can set up drying equipment and monitor moisture levels over time. They can also perform moisture mapping to identify hidden damp areas. This is especially useful if you have had flooding or a major leak in the past.
When to Call for Help
You should call for help if you cannot find the source of moisture, if the smell is strong and persistent, or if you suspect mold. The pros can inspect the basement and recommend the right course of action. They can also handle cleanup if there is standing water.
If you live in Redmond, you know the climate can bring wet spells. Acting quickly is key to preventing more damage. Check your insurance policy to see what is covered. Policies vary, and your insurer decides what is covered.
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (425) 407-5186Frequently asked questions
Is a cellar smell dangerous?
The smell itself is not usually dangerous, but it often points to moisture and potential mold growth. Mold can trigger allergies or respiratory issues. If you feel unwell, see a doctor. Address the moisture source to avoid health problems.
Can I just use air fresheners to mask the smell?
Air fresheners only hide the odor temporarily and do not solve the moisture problem. The underlying dampness will persist and may worsen. Focus on finding and fixing the source, then dry and clean the area thoroughly.
How long does it take to get rid of the smell?
It depends on the cause and extent of moisture. Once you fix the leak and dry the space, the smell can fade within days to a few weeks. If materials are deeply saturated, professional drying may be needed and can take longer.