The short answer
Bacteria and Mold Growth
When water sits in carpet, it brings in dirt, skin cells, and other organic material. That becomes food for bacteria and mold. As they grow, they release gases that smell like mildew or rotten eggs. Even after the carpet dries, the organisms can survive in the dried residue and keep producing odor.
Mold can start growing within 24 to 48 hours of a water event. If the carpet was wet for a while, the mold may have already spread into the padding and the subfloor underneath. Drying the surface does not kill mold. It just stops the moisture that helped it grow.
- Mold can be a health concern, especially for people with allergies or asthma.
- If you see black spots or smell a strong musty odor, treat it as a potential mold problem.
- Do not try to clean mold yourself with bleach; it can make the problem worse.
- A mold professional can test the area and recommend safe removal.
- If you feel unwell from the smell, see a doctor.
The Subfloor and Tack Strips
Water can seep through the carpet and padding into the subfloor, which is often wood or concrete. Wood subfloors absorb water and can warp or rot. Concrete can wick moisture up from the ground. Both can hold moisture for a long time and cause a lingering odor even after the carpet is dry.
Tack strips, the wooden strips with nails that hold the carpet in place, can also get wet. They are often made of particleboard, which soaks up water and swells. Once they get wet, they can smell musty and may need to be replaced.
What You Can Do at Home
Start by removing any furniture from the carpet and opening windows to get air moving. Use fans and a dehumidifier to pull moisture out of the room. If the smell is mild and the carpet dried quickly, you might be able to clean it with a vinegar and water solution, but test a small spot first.
If the smell persists after a few days, the padding or subfloor is likely the problem. You can try sprinkling baking soda on the carpet, letting it sit, and vacuuming it up. That can absorb some odors, but it won't fix the root cause.
When to Call in the Pros
If the carpet was soaked for more than a day, or if the smell stays after you've tried cleaning, it's time to get help. Local water damage pros can test the moisture levels in the padding and subfloor. They have equipment that can dry the deeper layers, or they may recommend removing the carpet and padding.
The cost of professional drying depends on the size of the area, the amount of water, and how long it sat. It often ranges from a few hundred to a few thousand dollars. The pros can also check for mold and advise on the right next steps. Acting quickly can save your carpet and your health.
Talk to someone now
Phones are answered 24/7 for Mesa and nearby communities.
Call Now (480) 898-4279Frequently asked questions
Can I dry wet carpet with a fan?
A fan can help dry the surface, but it won't reach the padding or subfloor. Use fans and a dehumidifier together, and open windows. If the carpet was wet for more than 48 hours, a fan alone won't prevent mold or odor.
Does baking soda remove the smell?
Baking soda can absorb some surface odors, but it doesn't remove the source. If the padding or subfloor is wet, the smell will return. Use baking soda as a temporary fix while you address the moisture problem.
Is it safe to stay in a room with smelly carpet?
A musty smell often means mold or bacteria, which can be a health risk. If you have allergies or asthma, it's safer to stay out of the room until the issue is resolved. See a doctor if you feel unwell.