Dŵr Cymru Cyfyngedig (referred to as Welsh Water) is a wholly-owned subsidiary of Glas Cymru Holdings Cyfyngedig (Glas Cymru) and is the Group’s principal trading company. Its principal activity is the supply of water and the treatment and disposal of wastewater, under an Instrument of Appointment (Licence) made by the Secretary of State for Wales under the Water Act 1989.