The International Society for Trenchless Technology (ISTT) was established in September 1986 as a United Kingdom private limited company with the object "to advance the science and practice of trenchless technology for the public benefit..." and "to promote education, training, study and research in the said science and practice for the public benefit, and to publish the useful results of the same." In the years that followed, ISTT affiliated with regional trenchless societies located throughout the world to advance these objectives globally.
ISTT has 28 Affiliated Societies. All recorded members of an Affiliated Society are members of ISTT. In addition to Affiliated Society members, ISTT has a limited number of direct members who reside in regions where no Affiliate Society exits.
Photo above: International Council Meeting 2022 in Helsinki, Finland