What is ISO 14001 certification? There are two types of certification: certification of a company’s environmental management system against the ISO 14001 requirements, and certification of individuals to be able to audit against the ISO 14001 requirements.What is ISO 14001 certification? There are two types of certification: certification of a company’s environmental management system against the ISO 14001 requirements, and certification of individuals to be able to audit against the ISO 14001 requirements.