Introduction

Infiltration of groundwater into sewers through defective joints and other defects in the pipes, is a major cause of untreated discharges from sewer systems. Cured-in-place-pipe (CIPP) lining systems are one of the principal methods for sealing pipes to reduce discharges to the environment.

Development of this WIS was undertaken by a Task and Finish Group chaired by a representative of Thames Water. The Group contained representatives from five other UK water companies, the Government of Jersey and eight CIPP lining system suppliers. The draft WIS was open for three-months public comment on the WUK Standards Board website before finalisation and publication in its present form.