First and foremost, a reputable inspector will be a certified Home Builder within the state you reside in. Additionally, look for an Inspector that is affiliated with InterNACHI (International Association of Certified Home Inspectors) and ASHI (American Society of Home Inspectors.) An Inspector with certifications in areas of importance such as Mold Remediation, Septic Systems and Lead Abatement is also key to providing you a thorough inspection.