The Technical committee for wastewater engineering, CEN/TC 165 having determined the current status of European standardization regarding general requirements for drain and sewer systems and existing standards and draft standards on the subject of rehabilitation of drain and sewer systems, and CEN/TC 165 having considered the results of a enquiry submitted by EUREAU on the status of European Standards in the field of rehabilitation of drain and sewer systems it was established that those were not sufficiently known. The Technical Report contains summarized information on the state of work on European Standardization in the field of rehabilitaton of drain and sewer systems.