The short answer
Find the Moisture Source
The mildew smell is a sign that something is wet and staying wet. Look for obvious leaks like a dripping pipe, a stained ceiling, or a damp patch on the floor. Check areas where water often collects, such as under sinks, around the water heater, or near the AC drain line.
If you cannot see a leak, the moisture may be hidden. Feel walls for dampness and check the attic for wet insulation. A musty smell in one room often points to a specific spot, so trace the odor to its strongest point. That is where the problem likely lives.
- Check under sinks and around toilets
- Inspect the attic for wet insulation
- Look for stains on ceilings or walls
- Feel carpets and baseboards for dampness
- Smell near the AC unit or drain line
- Check the water heater area for puddles
Dry Out the Affected Area
Once you find the wet spot, dry it as soon as possible. Open windows, run fans, and use a dehumidifier if you have one. Remove wet carpets, rugs, or furniture that can hold moisture. The longer something stays damp, the stronger the mildew smell will become.
For small areas, you can dry them yourself with towels and airflow. For larger areas like soaked drywall or saturated flooring, the pros may be needed. They have equipment to dry materials that you cannot fully handle at home, like inside wall cavities or under flooring.
Clean and Remove Mildew
After the area is dry, you need to clean away the mildew. A solution of water and mild detergent can work on hard surfaces. For porous materials like drywall or wood, the mildew may have soaked in, and cleaning alone will not remove the smell.
If the material is badly damaged, it may need to be removed and replaced. For example, water-damaged drywall often has to be cut out and new drywall installed. The pros can handle this type of work, including removing water-damaged flooring and treating the underlying structure.
Prevent Future Moisture Problems
To keep the mildew smell from coming back, you need to stop moisture from building up. Fix any leaks right away, whether they are from a pipe, the roof, or the AC drain line. Make sure your home has good airflow, especially in bathrooms, kitchens, and the laundry room.
Check your home regularly for signs of water damage. Look at the attic and crawl spaces for dampness. If you live in a dry climate, keep an eye on areas where water might sit after a storm. Catching a leak early is much easier than dealing with a strong mildew smell later.
When to Call the Pros
Some mildew problems are too big for a homeowner to handle alone. If the smell is strong and you cannot find the source, or if the water damage covers a large area, it is time to call local water damage pros. They can inspect the home, find hidden moisture, and dry out the affected areas.
The pros can also help with cleanup and repairs, such as removing water-damaged drywall or flooring. For a thorough job, they may use specialized drying equipment and antimicrobial treatments. The cost depends on the extent of the damage and the materials involved, so ask for a clear explanation of what is needed.
Water damage does not wait
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (480) 898-4279Frequently asked questions
Can a mildew smell make you sick?
Mildew and mold can cause respiratory irritation, especially for people with allergies or asthma. If you feel unwell, see a doctor. It is a good idea to address the moisture problem quickly to reduce exposure.
Will bleach remove the mildew smell?
Bleach can clean hard surfaces, but it does not always remove the smell from porous materials like drywall or wood. The odor often returns if the moisture is not fully dried. In many cases, the damaged material needs to be removed.
How long does it take for mildew to grow?
Mildew can start growing within 24 to 48 hours on damp surfaces. The smell may develop quickly, especially in warm, dark spaces. Acting fast to dry the area is the right way to prevent mildew from spreading.