The short answer
Start with Your Nose
The first step is often the simplest: walk through your home and note where the smell is strongest. Pros ask you to describe the odor, because a musty smell points to mold, a rotten egg smell might mean a gas leak, and a fishy odor could signal an electrical issue. This initial clue narrows the search area significantly.
Once the general area is identified, pros look for visible signs of water damage, like stains on ceilings or walls, warped flooring, or peeling paint. They also feel for dampness on surfaces and check for high humidity in the room. These clues help them decide where to use more advanced tools.
- Musty or earthy smell often means mold or mildew
- Rotten egg smell could be a gas leak or bacteria in water
- Fishy or burning smell may point to an electrical problem
- Sweet or syrupy odor can indicate antifreeze or a pest issue
- Damp or wet dog smell suggests water trapped in fabrics or insulation
Use Moisture Meters
Moisture meters are handheld tools that measure the amount of water in materials like drywall, wood, and concrete. Pros press the probes against surfaces in the suspected area to get a reading. A high reading tells them that moisture is present, even if there is no visible stain or wet spot.
These readings help pros map out the extent of the moisture problem. They might take multiple readings along a wall to find the exact spot where the moisture level spikes. That spot is often the source of the smell, or at least the entry point for water.
Follow the Water Trail
Water travels, and the smell may appear far from the actual leak. Pros trace the path of moisture by looking for water stains, rust, or mineral deposits along ceilings, walls, and floors. They also check for dampness in areas that are not directly under the suspected leak, because water can wick through materials.
For example, a leak from a pipe in a wall can saturate the drywall and travel down to the floor, causing a smell in the room below. Pros use their knowledge of building construction to predict where water would flow and check those areas. This systematic approach helps them pinpoint the origin.
Consider the HVAC System
Sometimes the smell is not from a water leak at all, but from your heating, ventilation, and air conditioning system. Pros check the drip pan, drain lines, and filters for mold or bacteria growth. A clogged drain line can cause water to overflow and create a musty odor.
They also inspect ductwork for moisture and debris. If the smell seems to come from the vents, the HVAC system is a likely source. Where air conditioning runs often, keeping the drain line clear is important. If the pros find an issue there, they may recommend a specific cleaning service.
Talk to someone now
Phones are answered 24/7 for Mesa and nearby communities.
Call Now (480) 898-4279Frequently asked questions
Can I find the source myself?
You can start by following your nose and looking for visible water stains or damp spots. However, hidden leaks inside walls or under floors may be hard to find without proper tools. If the smell persists, consider hiring a professional to do a thorough inspection.
What if the smell is from mold?
Mold smells musty and can grow in damp areas. If you suspect mold, it is important to address the moisture problem first. For small areas, you may be able to clean with a mild detergent, but for larger growth, consult a mold professional. Protect yourself by wearing gloves and a mask.
Is a bad smell always from water damage?
Not always. It could be from a dead animal, a gas leak, or an electrical issue. If you smell gas or something burning, leave the home and call your gas company or an electrician. For other odors, a water damage pro can help determine the cause.