Service
Hidden Mold & Musty Odor Investigation
A musty smell usually means something is growing somewhere. We follow the odor using moisture readings, thermal imaging, and targeted sampling to find where it's coming from, so you fix the cause instead of masking the smell.
This page describes hidden mold & musty odor investigation at our main San Diego location, Pro Plus Mold Inspection. Call (619) 935-5995 to schedule.
When it's useful
- A smell that comes back after cleaning
- Odor stronger in one room or cabinet
- Smell after rain or AC use
What we do
- 1Odor history and pattern questions
- 2Systematic room-by-room search
- 3Moisture and thermal checks
- 4Wall cavity or air sampling as needed
Inspection scope
- The rooms and areas you're concerned about, plus related areas such as nearby bathrooms, under sinks, and exterior walls
- Accessible attics and crawl spaces, where safe to enter
- Moisture readings on suspect walls, ceilings, floors, and cabinetry
- Thermal imaging of suspect areas to guide moisture readings
Sampling options
- Sampling isn't automatic. We recommend it only when it will answer a question the inspection can't.
- Air samples may be interpreted with outdoor comparison samples as appropriate to the sampling plan, alongside site observations.
- Surface swab or tape-lift samples characterize material collected at the specified surface, not an outdoor air baseline.
What you receive
- A walkthrough of what we found while we're on site, when you're available
- A written summary of observations, moisture readings, and likely moisture sources
- Laboratory results, if samples were taken
- Plain-language next steps, including when no further action is needed
Limitations
- We inspect accessible areas only. We don't open walls, move heavy furniture, or remove finishes unless agreed in advance.
- Thermal imaging shows temperature differences, not mold. Readings are confirmed with a moisture meter.
- Sampling results are limited to the method, time and location sampled; they cannot establish whole-building safety or the absence of hidden mold.
- Inspection and testing cannot diagnose illness, determine the cause of symptoms, or rule out a medical condition. Direct health questions to qualified medical professionals.
- There are no EPA or federal airborne mold limits. Sampling cannot establish compliance with federal mold standards or guarantee health safety.
- Findings reflect accessible areas and conditions during the visit; they cannot guarantee that all hidden mold is found or that future conditions remain unchanged.
Hidden Mold & Musty Odor Investigation questions
Do I need testing if I can already see mold?
Often not. If growth is visible, finding and fixing the moisture source matters most. Testing helps when the source is hidden, when you need documentation, or after cleanup.
How should I prepare?
Clear access to the areas of concern, the attic hatch, and the crawl space entry, and tell us about any past leaks or repairs. See our preparation guide for details.
Related services
Wall Cavity Mold Inspection & Testing
Testing the air inside wall cavities to check for hidden mold behind drywall after leaks.
Learn moreCrawl Space Mold Inspection
Check crawl spaces under raised floors for moisture, wood rot conditions, and mold growth.
Learn moreMold Inspection
A visual and instrument-based mold inspection that finds visible growth, hidden moisture, and the conditions that let mold grow.
Learn moreOther Pro Plus locations
This service is listed for our San Diego location. Availability at other Pro Plus Mold Inspection locations isn't confirmed. Call the location you need, or see the location directory.
Book hidden mold & musty odor investigation in San Diego
Talk to an inspector or send us a quote request.