The short answer
Where the Smell Comes From
Storm water carries debris, dirt, and organic matter from outside. When it seeps into your home, it leaves behind residues that start to break down quickly. Bacteria and mold spores, which are always present in the air, land on the damp surfaces and begin to multiply within a day or two. Their metabolic processes produce gases that your nose picks up as a musty or sour smell.
The odor can also come from the water itself. Rainwater that has sat on roofs, gutters, or pavement picks up leaf litter, animal waste, and other organic material. Once inside, that mixture ferments and releases volatile compounds. Even if the water was clear when it entered, the combination of dust and humidity in your home creates conditions ripe for odor-causing growth.
Health and Safety Notes
Mold and bacteria from storm water can cause allergic reactions, respiratory irritation, or worse if you are sensitive. If you or anyone in your home starts coughing, sneezing, or feeling unwell, see a doctor. Do not ignore symptoms, especially if they worsen when you are indoors. Children, older adults, and people with asthma are more vulnerable.
Storm water may also contain contaminants like sewage or chemicals, depending on where it came from. If the water was black or foul-smelling, treat it as hazardous. Wear gloves, boots, and a mask while cleaning, and wash your hands thoroughly afterward. For large spills or contaminated water, the pros have protective gear and specialized equipment to handle it safely.
Preventing Future Odors
After the immediate cleanup, take steps to keep moisture out of your home. Inspect your roof for missing or damaged shingles, and seal gaps around windows and doors. Clean your gutters regularly so rainwater flows away from the foundation. If you live in Mesa, keep a written list of your shutoff valve locations in case a storm causes a pipe issue.
Consider installing a water alarm in your garage, laundry room, or near your water heater to alert you to leaks early. Also, maintain your HVAC system, as it can pull humid air into the house. If you had water damage, check insulation and drywall for a few weeks afterward to ensure they stay dry. Acting quickly after any new leak reduces the chance of odors.
When to Bring in the Pros
If the smell does not fade after thorough drying, or if you find mold growth on walls, ceilings, or floors, it is time to call local water damage pros. They can assess the extent of the moisture and recommend the right steps, which may include removing damaged drywall or flooring. Their goal is to dry the structure completely and prevent further issues.
The pros can locate moisture that is not visible, such as inside wall cavities or under flooring, and dry those areas with specialized equipment. In some cases, they may need to remove and replace materials that are too damaged to save. The cost depends on the size of the affected area, the type of materials, and how long the water sat. Policies vary, and your insurer decides what is covered.
- Water damage inspection to find hidden moisture
- Storm water damage cleanup for large spills
- Drywall water damage repair after drying
- Water-damaged flooring removal if needed
- Attic water damage restoration for roof leaks
- Carpet water damage cleanup for soaked rugs
Water damage does not wait
Phones are answered 24/7 for Mesa and nearby communities.
Call Now (480) 898-4279Frequently asked questions
How long does the smell last after a storm?
It depends on how much water got in and how quickly you dry the area. Small spills may dry in a few days, but soaked drywall or carpet can hold odor for weeks. If the smell persists after a week of drying, that points to hidden moisture or mold growth.
Can I remove the smell with air fresheners or bleach?
Air fresheners only mask the odor and do not fix the cause. Bleach can kill surface mold but does not reach mold inside walls or under flooring. The real solution is drying and removing the water-damaged material, not covering the smell.
Should I throw away furniture that got wet?
Porous items like upholstered couches, mattresses, and pillows may absorb storm water and become impossible to dry fully. If they smell musty after a few days, they are likely not worth keeping. Non-porous items like plastic or metal can be cleaned and dried.