Should the same company do the inspection and remediation?

Generally, no. Having the same company inspect and remediate creates a conflict of interest — they have a financial incentive to find mold that requires their services. For objective results, hire an independent inspector or industrial hygienist who doesn't perform remediation, then use their report to bid out the remediation work separately.

What mold levels are considered dangerous?

There are no federally regulated "safe" or "unsafe" mold levels for indoor air. Results are compared to outdoor baseline levels at the time of testing — elevated indoor spore counts compared to outdoor samples indicate an indoor mold source. The specific species identified also matters; some, like Stachybotrys (black mold), are more concerning than others.

What a Mold Inspection Involves

Q: What does a mold inspection include?

A professional mold inspection includes a visual assessment of the property for visible mold, moisture staining, and conditions that support mold growth; moisture readings in suspected areas; and typically air sampling to detect mold spores in the air. Some inspectors also take surface or bulk samples from visible mold for identification.

What a Mold Inspector Looks For

A thorough mold inspection has two components: visual assessment and testing.

Visual Assessment

Visible mold growth on surfaces (walls, ceilings, floors, HVAC components)
Water staining, discoloration, or efflorescence indicating past moisture intrusion
Musty odor — an indicator of microbial growth even when not visible
Moisture meter readings in suspected areas (walls, floors near plumbing)
Building conditions that promote mold: inadequate ventilation, condensation, known water intrusion history

Testing Methods

Air sampling (spore trap): A cassette captures a measured volume of air. Lab analysis identifies the types and concentrations of mold spores present. Results are compared against an outdoor baseline sample taken simultaneously. This is the most common method for determining if an indoor mold problem exists even without visible mold.
Surface sampling (tape lift or swab): Used to identify the species of visible mold or to confirm whether discoloration is mold.
Bulk sampling: A piece of material (drywall, insulation, carpet) is removed and sent to the lab. Used to identify mold species in building materials.
ERMI (Environmental Relative Moldiness Index): A dust sample analyzed via DNA sequencing. More sensitive than air sampling but not yet standardized as a field methodology.

Using the Inspection Results

A proper mold inspection report includes: the inspector's visual findings, moisture readings, sample locations and results, comparison to outdoor baseline, and recommendations. Use this report to:

Determine whether remediation is needed and its scope
Bid remediation work with a clear scope (not "remove mold" but "remediate X areas per IICRC S520 standards")
Verify remediation with clearance testing after work is complete
Document conditions for insurance claims or real estate transactions

Frequently Asked Questions

What does a mold inspection include?

Visual assessment for mold and moisture, moisture readings, and typically air sampling with lab analysis. Some inspectors also take surface or bulk samples.

Should the same company do inspection and remediation?

Generally no — there's a conflict of interest. Use an independent inspector and separate bidders for remediation.

What mold levels are dangerous?

No federal standards exist. Results are compared to outdoor baseline levels. Elevated indoor counts compared to outdoor indicate an indoor source needing attention.

Find Restoration Help in Your City

Browse all cities →

WaterDamageSource is an educational resource. Mold inspection and testing methodologies vary. Consult a qualified industrial hygienist or licensed mold inspector for your specific situation.