Who Should Conduct Clearance Testing?

Clearance testing is a critical step in confirming that a space has been properly cleaned and restored following the removal of hazardous materials such as mold, asbestos, or lead. But not just anyone can or should perform this testing. The accuracy and integrity of the results hinge on the expertise and qualifications of the person conducting the clearance testing.

Why Clearance Testing Matters

Clearance testing ensures that the remediation work—whether it’s for mold, asbestos, or other environmental hazards—has been completed effectively and that the area is now safe for re-occupancy. It protects both health and liability:

For property owners, it prevents future legal or health issues.
For tenants or occupants, it guarantees a clean and safe living or working environment.
For remediation companies, it provides validation of their work and peace of mind to clients.

The Right Professionals for the Job

Certified Industrial Hygienists (CIHs)

A Certified Industrial Hygienist (CIH) is one of the most qualified professionals to perform clearance testing. These individuals are trained in identifying and evaluating environmental hazards in buildings, particularly those that could impact human health. Their qualifications include:

Advanced knowledge of occupational and environmental health standards
Certification through the American Board of Industrial Hygiene (ABIH)
Proficiency in using specialized testing equipment
Independence from the remediation process, which helps ensure objectivity

CIHs are commonly called upon to assess complex situations involving multiple environmental risks, not just mold or asbestos.

Licensed Mold Inspectors

When the concern is primarily mold, a licensed mold inspector may be more appropriate. These professionals are trained specifically in mold identification, sampling, and remediation verification. Key qualifications include:

State-issued license (where applicable)
Completion of accredited training programs
Experience in both residential and commercial environments
Familiarity with moisture intrusion, HVAC systems, and building science

Mold inspectors often work closely with remediation companies, but should still maintain a degree of independence when conducting clearance tests to avoid conflicts of interest.

Why Qualifications Matter

Clearance testing requires more than just a basic knowledge of environmental hazards—it demands:

Proper sampling techniques (air, surface, dust)
Laboratory coordination for accurate analysis
Understanding of local and federal guidelines, such as those from the EPA or OSHA
Clear, unbiased reporting to all stakeholders

Using an unqualified person, or someone affiliated with the remediation crew, can lead to inaccurate results, missed contamination, or liability issues down the road.

When to Conduct Clearance Testing

Clearance testing should be conducted:

After remediation is completed
Before reconstruction or reoccupancy
When health complaints persist
To verify the effectiveness of DIY or contractor cleanup efforts

The timing and thoroughness of the testing are as important as the credentials of the person conducting it.

Conclusion

Clearance testing is not a formality—it’s a safeguard. Only qualified professionals, such as Certified Industrial Hygienists or licensed mold inspectors, should carry it out. Their expertise ensures that the space is genuinely safe, and their independence provides the objectivity needed for trustworthy results.

When it comes to health and liability, cutting corners on clearance testing is a risk no one should take.