Management of the integrated water Service pertains to the technical activities relating to the operation of the water supply, sewerage and purification plants and networks.

HERA's basic activity in the water sector concerns management of the Integrated Water Service meant as design, construction, operation, routine maintenance and extraordinary maintenance of tapping plants, purification for drinking, collection and lifting, and adduction, distribution and connection networks regarding the water system service, sewer service and the municipal waste water treatment plants. It also includes quality control of the drinking water and waste water sewage in compliance with the regulations in force.

In parallel with the technical activities, management of the Integrated Water Service envisages that a series of administrative activities be carried out, such as: stipulating, amending and terminating Integrated Water Service supply contracts or parts thereof, measuring and recording products supplied and services rendered, invoicing and collecting tariffs, and all those additional activities necessary for total execution of the Integrated Water Service.

The activities mentioned are carried out in the territory by the offices put in charge by the Territorial Operating Structure (TOSs). The networks and plants are operated both in normal running and maintenance conditions and to provide emergency services. The reports that the call centre receives are dealt with according to the provisions of the Service Charter in effect in the territory of jurisdiction of the TOSs
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The TOSs guarantee Emergency Services throughout the territory they serve 24h/24h through the call centre, which puts the contacts on call for the service in question into operation.