Wood-Destroying Organism Inspection Resources

InterNACHI provides inspectors a certification program and credential, Wood-Destroying Organism (WDO) checklist report, certification logo, online training course, and inspection field guides.
Performing WDO (or WDI) inspections may be regulated by your state or province. We recommend checking with the regulatory body, such as a Department of Agriculture.  

WDO Inspector Certification Program and Credential


WDO Checklist Report (free download)

This checklist does not require the inspector to specifically identify any insect. 


Visible Evidence

We often see clauses in inspection reports that take this form: “No visible evidence of [insert applicable defect].” We have concerns about the words “visible” and “evidence.” Please read more about using certain words in your inspection report


WDO Logo


WDO Inspection Course

WDO Inspection Field Guide


WDO Insect Inspection Guide (free) 


Field Guide (for purchase)


More WDO Resources